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Nanoparticle Exsolution on Perovskite Oxides:Insights into Mechanism,Characteristics and Novel Strategies
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作者 Yo Han Kim Hyeongwon Jeong +6 位作者 Bo‑Ram Won Hyejin Jeon Chan‑ho Park Dayoung Park Yeeun Kim Somi Lee Jae‑ha Myung 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第2期312-346,共35页
Supported nanoparticles have attracted considerable attention as a promising catalyst for achieving unique properties in numerous applications,including fuel cells,chemical conversion,and batteries.Nanocatalysts demon... Supported nanoparticles have attracted considerable attention as a promising catalyst for achieving unique properties in numerous applications,including fuel cells,chemical conversion,and batteries.Nanocatalysts demonstrate high activity by expanding the number of active sites,but they also intensify deactivation issues,such as agglomeration and poisoning,simultaneously.Exsolution for bottomup synthesis of supported nanoparticles has emerged as a breakthrough technique to overcome limitations associated with conventional nanomaterials.Nanoparticles are uniformly exsolved from perovskite oxide supports and socketed into the oxide support by a one-step reduction process.Their uniformity and stability,resulting from the socketed structure,play a crucial role in the development of novel nanocatalysts.Recently,tremendous research efforts have been dedicated to further controlling exsolution particles.To effectively address exsolution at a more precise level,understanding the underlying mechanism is essential.This review presents a comprehensive overview of the exsolution mechanism,with a focus on its driving force,processes,properties,and synergetic strategies,as well as new pathways for optimizing nanocatalysts in diverse applications. 展开更多
关键词 Supported nanoparticle EXSOLUTION In situ growth MECHANISM perovskite oxide CATALYST
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Tuning exsolution of nanoparticles in defect engineered layered perovskite oxides for efficient CO_(2) electrolysis 被引量:1
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作者 Zhengrong Liu Jun Zhou +7 位作者 Yueyue Sun Xiangling Yue Jiaming Yang Lei Fu Qinyuan Deng Hongfei Zhao Chaofan Yin Kai Wu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第9期219-227,共9页
Solid oxide electrolysis cell(SOEC) could be a potential technology to afford chemical storage of renewable electricity by converting water and carbon dioxide.In this work,we present the Ni-doped layered perovskite ox... Solid oxide electrolysis cell(SOEC) could be a potential technology to afford chemical storage of renewable electricity by converting water and carbon dioxide.In this work,we present the Ni-doped layered perovskite oxides,(La_(4)Sr_(n-4))_(0.9)Ti_(0.9n)Ni_(0.1n)O_(3n+2) with n=5,8,and 12(LSTNn) for application as catalysts of CO_(2) electrolysis with the exsolution of Ni nanoparticles through a simple in-situ growth method.It is found that the density,size,and distribution of exsolved Ni nanoparticles are determined by the number of n in LSTNn due to the different stack structures of TiO_6 octahedra along the c axis.The Ni doping in LSTNn significantly improved the electrochemical activity by increasing oxygen vacancies,and the Ni metallic nanoparticles afford much more active sites.The results show that LSTNn cathodes can successfully be manipulated the activity by controlling both the n number and Ni exsolution.Among these LSTNn(n=5,8,and 12),LSTN8 renders a higher activity for electrolysis of CO_(2) with a current density of 1.50A cm^(-2)@2.0 V at 800℃ It is clear from these results that the number of n in(La_(4)Sr_(n-4))_(0.9)Ti_(0.9n)Ni_(0.1n)O_(3n+2)with Ni-doping is a key factor in controlling the electrochemical performance and catalytic activity in SOEC. 展开更多
关键词 Layered perovskite oxides In-situ growth SOEC TITANATE
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Methane Oxidation to Synthesis Gas Using Lattice Oxygen of La_(1-x)Sr_xMO_(3-λ)(M =Fe,Mn) Perovskite Oxides Instead of Molecular Oxygen 被引量:10
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作者 LiRanjia YuChangchun ZhuGuangrong ShenShikong 《Petroleum Science》 SCIE CAS CSCD 2005年第1期19-23,共5页
In this paper, the partial oxidation of methane to synthesis gas using lattice oxygen of La1- SrxMO3-λ (M=Fe, x ... In this paper, the partial oxidation of methane to synthesis gas using lattice oxygen of La1- SrxMO3-λ (M=Fe, x Mn) perovskite oxides instead of molecular oxygen was investigated. The redox circulation between 11% O2/Ar flow and 11% CH4/He flow at 900℃ shows that methane can be oxidized to CO and H2 with a selectivity of over 90.7% using the lattice oxygen of La1- SrxFeO3-λ (x≤0.2) perovskite oxides in an appropriate reaction condition, while the lost lattice x oxygen can be supplemented by air re-oxidation. It is viable for the lattice oxygen of La1- SrxFeO3-λ (x≤0.2) perovskite x oxides instead of molecular oxygen to react with methane to synthesis gas in the redox mode. 展开更多
关键词 Partial oxidation METHANE synthesis gas lattice oxygen La1- xSrxFeO3-λperovskite oxides
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Comparison of LaFeO_3,La_(0.8)Sr_(0.2)FeO_3,and La_(0.8)Sr_(0.2)Fe_(0.9)CO_(0.1)O_3 perovskite oxides as oxygen carrier for partial oxidation of methane 被引量:4
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作者 Xiaoping Dai Changchun Yu Qiong Wu 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2008年第4期415-418,共4页
Comparison of LaFeO3, La0.8Sr0.2FeO3, and La0.8Sr0.2Fe0.9CO0.1O3 perovskite oxides as oxygen carrier for partial oxidation of methane in the absence of gaseous oxygen was investigated by continuous flow reaction and s... Comparison of LaFeO3, La0.8Sr0.2FeO3, and La0.8Sr0.2Fe0.9CO0.1O3 perovskite oxides as oxygen carrier for partial oxidation of methane in the absence of gaseous oxygen was investigated by continuous flow reaction and sequential redox reaction, Methane was oxidized to syngas with high selectivity by oxygen species of perovskite oxides in the absence of gaseous oxygen. The sequential redox reaction revealed that the structural stability and continuous oxygen supply in redox reaction decreased over La0.8Sr0.2Fe0.9Co0. 1O3 oxide, while LaFeO3 and La0.8Sr0.2FeO3 exhibited excellent structural stability and continuous oxygen supply. 展开更多
关键词 perovskite oxides oxygen carrier METHANE synthesis gas continuous flow reaction sequential redox reaction
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Boosting the oxygen evolution reaction through migrating active sites from the bulk to surface of perovskite oxides 被引量:2
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作者 Zhengsen Wang Ziyi Hao +3 位作者 Fang Shi Kaiyue Zhu Xuefeng Zhu Weishen Yang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第6期434-441,I0012,共9页
The oxygen evolution reaction (OER) dominates the efficiency of electrocatalytic water splitting owing to its sluggish kinetics.Perovskite oxides (ABO_(3)) have emerged as promising candidates to accelerate the OER pr... The oxygen evolution reaction (OER) dominates the efficiency of electrocatalytic water splitting owing to its sluggish kinetics.Perovskite oxides (ABO_(3)) have emerged as promising candidates to accelerate the OER process owing to their high intrinsic activities and tailorable properties.Fe ions in perovskite oxides have been proved to be a highly catalytic element for OER,while some Fe-based perovskites such as SrTi_(0.8)Fe_(0.2)O_(3-δ)(STF) and La_(0.66)Ti_(0.8)Fe_(0.2)O_(3-δ)(LTF) exhibit inferior OER activity.Yet the essential reason is still unclear and the effective method to promote the activity of such perovskite is also lacking.Herein,an in-situ exsolution strategy was proposed to boost the OER by migrating Fe from the bulk to the surface.Significantly enhanced OER activity was achieved on STF and LTF perovskites with surfacedecorated oxygen vacancies and Fe nanoparticles.In addition,theoretical calculation confirmed that the oxygen vacancies and Fe nanoparticle on surface could lower the overpotential of OER by facilitating the adsorption of OH^(-).From this study,migration of the active elements in perovskite is found to be an effective strategy to increase the quantity and activity of active sites,providing new insights and understanding for designing efficient OER catalysts. 展开更多
关键词 Oxygen evolution reaction(OER) perovskite oxides Oxygen vacancy Fe nanoparticles Migration of active site
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Perovskite Oxides in Catalytic Combustion of Volatile Organic Compounds:Recent Advances and Future Prospects 被引量:2
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作者 Li Yang Yanzhi Li +2 位作者 Yundong Sun Wei Wang Zongping Shao 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2022年第3期751-776,共26页
Volatile organic compounds are a kind of important indoor and outdoor air pollutants.In recent years,more and more attention has been paid to the ways of volatile organic compound elimination because of its potential ... Volatile organic compounds are a kind of important indoor and outdoor air pollutants.In recent years,more and more attention has been paid to the ways of volatile organic compound elimination because of its potential long-term effects on human health.Among the various available methods for volatile organic compound elimination,the catalytic combustion is the most attractive method due to its high efficiency,low cost,simple operation,and easy scale-up.Perovskite oxides,as a large family of metal oxides with their A-site mainly of lanthanide element and/or alkaline earth metal element and B-site of transition metal element,have been extensively investigated as active and stable catalysts for volatile organic compound removal reactions due to their abundant compositional elements,high thermal/chemical stability,and compositional/structural flexibility.The catalytic performance of perovskite oxides is strongly depended on its material composition,morphology,and surface/bulk properties,while the doping,tailored synthesis route,and composite construction may have a significant effect on the bulk(oxygen vacancy concentration,lattice structure),surface(oxygen species,defect)properties,and particulate morphology,consequently the catalytic activity and stability for volatile organic compound removal.Herein,a comprehensive review about the recent advances in perovskite oxides for volatile organic compound elimination reactions based on catalytic combustion is presented from different aspects with a special emphasis on the material design strategies,such as compositional tuning,morphology control,nanostructure building,hybrid construction,and surface modification.At last,some perspectives are presented on the development and design of perovskite oxide-based catalysts for volatile organic compound removal applications by highlighgting the critical issues and challenges. 展开更多
关键词 catalytic combustion catalytic performance material design perovskite oxides volatile organic compounds
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Recent advances and future perspectives of Ruddlesden–Popper perovskite oxides electrolytes for all-solid-state batteries
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作者 Chongyang Zhou Weibin Guo +6 位作者 Jiayao Fan Naien Shi Yi Zhao Xu Yang Zhen Ding Min Han Wei Huang 《InfoMat》 SCIE CSCD 2024年第8期1-19,共19页
All-solid-state batteries equipped with solid-state electrolytes(SSEs)havegained significant interest due to their enhanced safety,energy density,andlongevity in comparison to traditional liquid organic electrolyte-ba... All-solid-state batteries equipped with solid-state electrolytes(SSEs)havegained significant interest due to their enhanced safety,energy density,andlongevity in comparison to traditional liquid organic electrolyte-based batteries.However,many SSEs,such as sulfides and hydrides,are highly sensitiveto water,limiting their practical use.As one class of important perovskites,theRuddlesden–Popper perovskite oxides(RPPOs),show great promise as SSEsdue to their exceptional stability,particularly in terms of water resistance.Inthis review,the crystal structure and synthesis methods of RPPOs SSEs are firstintroduced in brief.Subsequently,the mechanisms of ion transportation,including oxygen anions and lithium-ions,and the relevant strategies forenhancing their ionic conductivity are described in detail.Additionally,theprogress made in developing flexible RPPOs SSEs,which are critical for flexibleand wearable electronic devices,has also been summarized.Furthermore,thekey challenges and prospects for exploring and developing RPPOs SSEs in allsolid-state batteries are suggested.This review presents in detail the synthesismethods,the ion transportation mechanism,and strategies to enhance theroom temperature ionic conductivity of RPPOs SSEs,providing valuableinsights on enhancing their ionic conductivity and thus for their practicalapplication in solid-state batteries. 展开更多
关键词 all-solid-state batteries ionic conductivity improvement strategies Ruddlesden–Popper perovskite oxides solid-state electrolytes
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Synergetic effect of lattice distortion and oxygen vacancies on high-rate lithium-ion storage in high-entropy perovskite oxides 被引量:7
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作者 Yanggang Jia Shijie Chen +5 位作者 Xia Shao Jie Chen Dao-Lai Fang Saisai Li Aiqin Mao Canhua Li 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第6期1214-1227,共14页
High-entropy oxides(HEOs)have gained great attention as an emerging kind of highperformance anode materials for lithium-ion batteries(LIBs)due to the entropy stabilization and multi-principal synergistic effect.Herein... High-entropy oxides(HEOs)have gained great attention as an emerging kind of highperformance anode materials for lithium-ion batteries(LIBs)due to the entropy stabilization and multi-principal synergistic effect.Herein,the porous perovskite-type RE(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3)(RE(=La,Sm,and Gd)is the abbreviation of rare earth)HEOs were successfully synthesized by a solution combustion synthesis(SCS)method.Owing to the synergistic effect of lattice distortion and oxygen vacancies(Ov),the Gd(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3) electrode exhibits superior high-rate lithium-ion storage performance and excellent cycling stability.A reversible capacity of 403 mAh·g^(-1) at a current rate of 0.2 A·g^(-1) after 500 cycles and a superior high-rate capacity of 394 mAh·g^(-1)even at 1.0 A·g^(-1)after 500 cycles are achieved.Meanwhile,the Gd(Co_(0.2)Cr_(0.2)Fe_(0.2)Mn_(0.2)Ni_(0.2))O_(3) electrode also exhibits a pronounced pseudo-capacitive behavior,contributing to an additional capacity.By adjusting and balancing the lattice distortion and oxygen vacancies of the electrode materials,the lithium-ion storage performance can be further regulated. 展开更多
关键词 high-entropy anode perovskite oxides lattice distortion oxygen vacancies(Ov) PSEUDOCAPACITANCE high-rate performance
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Review on field-induced phase transitions in lead-free NaNbO_(3)-based antiferroelectric perovskite oxides for energy storage 被引量:6
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作者 Mao-Hua Zhang Lovro Fulanovi +1 位作者 Changhao Zhao Jurij Koruza 《Journal of Materiomics》 SCIE CSCD 2023年第1期1-18,共18页
Emerging new applications of antiferroelectric perovskite oxides based on their fascinating phase transformation between polar and nonpolar states have provided considerable attention to this class of materials even d... Emerging new applications of antiferroelectric perovskite oxides based on their fascinating phase transformation between polar and nonpolar states have provided considerable attention to this class of materials even decades after the discovery of antiferroelectricity.After presenting the challenge of formulating a precise definition of antiferroelectric materials,we briefly summarize proposed applications.In the following,we focus on the crystallographic structures of the antiferroelectric and ferroelectric phases of NaNbO_(3),which is emerging as a promising alternative to PbZrO_(3)-based systems.The field-induced phase transition behavior of NaNbO_(3)-based AFE materials in the form of single crystals,bulk ceramics,and multilayer ceramic capacitors is reviewed.Recent advances in a group of materials exhibiting high energy storage performance and relaxor-like behavior are also covered.The influence of electrode geometry on phase transition behavior and thus on the energy storage property is briefly addressed.The review concludes with an overview of the remaining challenges related to the fundamental understanding of the scientific richness of AFE materials in terms of structure,microstructure,defect transport under high fields,and phase transition dynamics required for their future development and applications. 展开更多
关键词 ANTIFERROELECTRIC perovskite oxides Energy storage NaNbO_(3) Phase transition Lead free
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Catalytic combustion of volatile organic compounds using perovskite oxides catalysts—a review 被引量:1
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作者 Shan Wang Ping Xiao +4 位作者 Jie Yang Sónia ACCarabineiro Marek Wiśniewski Junjiang Zhu Xinying Liu 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2023年第11期1649-1676,共28页
With the rapid development of industry,volatile organic compounds(VOCs)are gaining attention as a class of pollutants that need to be eliminated due to their adverse effects on the environment and human health.Catalyt... With the rapid development of industry,volatile organic compounds(VOCs)are gaining attention as a class of pollutants that need to be eliminated due to their adverse effects on the environment and human health.Catalytic combustion is the most popular technology used for the removal of VOCs as it can be adapted to different organic emissions under mild conditions.This review first introduces the hazards of VOCs,their treatment technologies,and summarizes the treatment mechanism issues.Next,the characteristics and catalytic performance of perovskite oxides as catalysts for VOC removal are expounded,with a special focus on lattice distortions and surface defects caused by metal doping and surface modifications,and on the treatment of different VOCs.The challenges and the prospects regarding the design of perovskite oxides catalysts for the catalytic combustion of VOCs are also discussed.This review provides a reference base for improving the performance of perovskite catalysts to treat VOCs. 展开更多
关键词 perovskite oxides volatile organic compounds catalytic combustion reaction mechanism
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High-entropy perovskite oxides:An emergent type of photochromic oxides with fast response for handwriting display
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作者 Xiangyu Wang Tong Wei +3 位作者 Yingqiu Xu Liwei Wu Yingdong Han Jiao Cui 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2023年第7期1371-1388,共18页
Stimulus-responsive materials are fundamental to the broad and ever-growing field of intelligence research,which bridge intelligent systems with the Internet of Things(loT)in future lifestyles.Among these materials,wr... Stimulus-responsive materials are fundamental to the broad and ever-growing field of intelligence research,which bridge intelligent systems with the Internet of Things(loT)in future lifestyles.Among these materials,writable materials have received great interest;however,carbonization and irreversible writing processes are generally inevitable for extensively investigated organic compounds.Photochromism is a potential mode of composing information.Nevertheless,inorganic materials usually exhibit weak photochromic effects.Here,a novel strategy of designing high-entropy perovskite(HEP)oxides is put forward to develop a new inorganic photochromic system with satisfying performance.A series of HEP oxides are synthesized for the first time.Benefiting from excellent photochromic features,real-time information encoding was achieved.The mechanism-related photochromism is also discussed.Distinct from the previous works,it is believed that the present photochromic-based HEP oxides provide a new and manyfold research space for the future development of conventional writable materials and the disclosing of unprecedented properties and phenomena. 展开更多
关键词 stimulus-responsive materials inorganic materials high-entropy perovskite(HEP)oxides PHOTOCHROMISM
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Recent progress in the development of RE_(2)TMTM’O_(6)double perovskite oxides for cryogenic magnetic refrigeration
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作者 Lingwei Li Mi Yan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第5期1-12,共12页
The magnetic functional materials play a particularly important role in our modern society and daily life.The magnetocaloric effect(MCE)is at the basis of a solid state magnetic refrigeration(MR)technology which may e... The magnetic functional materials play a particularly important role in our modern society and daily life.The magnetocaloric effect(MCE)is at the basis of a solid state magnetic refrigeration(MR)technology which may enhance the efficiency of cooling systems,both for room temperature and cryogenic appli-cations.Despite numerous experimental and theoretical MCE studies,commercial MR systems are still at developing stage.Designing magnetic solids with outstanding magnetocaloric performances remains therefore a most urgent task.Herein,recent progresses on characterizing the crystal structure,magnetic properties and cryogenic MCE of rare earths(RE)-based RE_(2)TMTM’O_(6)double perovskite(DP)oxides,where TM and TM’are different 3d transition metals,are summarized.Some Gd-based DP oxides are found to exhibit promising cryogenic magnetocaloric performances which make them attractive for active MR ap-plications. 展开更多
关键词 Magnetocaloric effect(MCE) Rare earths Double perovskite(DP)oxides Magnetic functional materials Cryogenic magnetic refrigeration Magnetocaloric performances
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Pseudo core-shell LaCoO3@MgO perovskite oxides for high performance methane catalytic oxidation 被引量:4
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作者 Saifei Wang Jie Liu +4 位作者 Yiyuan Zhang Peiqi Chu Haobin Liu Man Wang Erhong Duan 《Journal of Rare Earths》 SCIE EI CAS CSCD 2021年第1期51-57,I0002,共8页
Magnesia modified LaCoO3 was prepared by a facile one-step sol-gel method and used for removal of dilute methane.Compared with the conventional doping technique,the obtained LaCoO3@MgO-x exhibits pseudo core-shell str... Magnesia modified LaCoO3 was prepared by a facile one-step sol-gel method and used for removal of dilute methane.Compared with the conventional doping technique,the obtained LaCoO3@MgO-x exhibits pseudo core-shell structure and shows superior catalytic activity.The methane conversion exceeds90%at 532℃on LaCoO3@MgO-0.1,while only 60%of methane is conversed using the doped perovskite LaCo0.9Mg0.1O3.The high catalytic performance of LaCoO3@MgO-0.1 is mainly attributed to the adjustment of surface acid-base properties by the MgO shell structure.According to density functional theory(DFT)calculation,the methane is more likely to be adsorbed and cracked on LaCoO3@MgO-0.1.The in situ DRIFTS shows that CH3-O-CH3 intermediate specie is formed.The pseudo core-shell structure also enhances the stability and the LaCoO3@MgO-0.1 maintains high activity after working for 100 h.The above results demonstrate that surface modification by magnesia is an effective strategy for improving LaCoO3 catalytic performance. 展开更多
关键词 perovskite oxides Core-shell structure Surface acid-base properties Methane catalytic oxidation Rare earths
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Adjusting oxygen vacancies in perovskite LaCoO_(3)by electrochemical activation to enhance the hydrogen evolution reaction activity in alkaline condition 被引量:1
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作者 Chengrong Wu Yan Sun +4 位作者 Xiaojian Wen Jia-Ye Zhang Liang Qiao Jun Cheng Kelvin H.L.Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第1期226-232,I0006,共8页
Developing highly-active,earth-abundant non-precious-metal catalysts for hydrogen evolution reaction(HER)in alkaline solution would be beneficial to sustainable energy storage.Perovskite oxides are generally regarded ... Developing highly-active,earth-abundant non-precious-metal catalysts for hydrogen evolution reaction(HER)in alkaline solution would be beneficial to sustainable energy storage.Perovskite oxides are generally regarded as low-active HER catalysts,due to their inapposite hydrogen adsorption and water dissociation.Here,we report a detailed study on perovskite LaCoO_(3)epitaxial thin films as a model catalyst to significantly enhance the HER performance via an electrochemical activation process.As a result,the overpotential for the activation films to achieve a current density of 0.36 m A/cm^(2)is 238 m V,reduced by more than 200 m V in comparison with that of original samples.Structural characterization revealed the activation process dramatically increases the concentration of oxygen vacancies(Vo)on the surface of LaCoO_(3).We established the relationship between the electronic structure induced by Vo and the enhanced HER activity.Further theoretical calculations revealed that the Vo optimizes the hydrogen adsorption and dissociation of water on the surface of LaCoO_(3)thin films,thus improving the HER catalytic activity.This work may promote a deepened understanding of perovskite oxides for HER mechanism by Vo adjusting and a new avenue for designing highly active electrochemical catalysts in alkaline solution. 展开更多
关键词 Hydrogen evolution reaction perovskite oxides Activation process Oxygen vacancies
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In operando-formed interface between silver and perovskite oxide for efficient electroreduction of carbon dioxide to carbon monoxide
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作者 Xinhao Wu Yanan Guo +11 位作者 Yuxing Gu Fenghua Xie Mengran Li Zhiwei Hu Hong-Ji Lin Chih-Wen Pao Yu-Cheng Huang Chung-Li Dong Vanessa KPeterson Ran Ran Wei Zhou Zongping Shao 《Carbon Energy》 SCIE CSCD 2023年第4期81-93,共13页
Electrochemical carbon dioxide(CO_(2))reduction(ECR)is a promising technology to produce valuable fuels and feedstocks from CO_(2).Despite large efforts to develop ECR catalysts,the investigation of the catalytic perf... Electrochemical carbon dioxide(CO_(2))reduction(ECR)is a promising technology to produce valuable fuels and feedstocks from CO_(2).Despite large efforts to develop ECR catalysts,the investigation of the catalytic performance and electrochemical behavior of complex metal oxides,especially perovskite oxides,is rarely reported.Here,the inorganic perovskite oxide Ag-doped(La_(0.8)Sr_(0.2))_(0.95)Ag_(0.05)MnO_(3-δ)(LSA0.05M)is reported as an efficient electrocatalyst for ECR to CO for the first time,which exhibits a Faradaic efficiency(FE)of 84.3%,a remarkable mass activity of 75Ag^(-1)(normalized to the mass of Ag),and stability of 130 h at a moderate overpotential of 0.79 V.The LSA0.05M catalyst experiences structure reconstruction during ECR,creating the in operando-formed interface between the perovskite and the evolved Ag phase.The evolved Ag is uniformly distributed with a small particle size on the perovskite surface.Theoretical calculations indicate the reconstruction of LSA0.05M during ECR and reveal that the perovskite-Ag interface provides adsorption sites for CO_(2) and accelerates the desorption of the*CO intermediate to enhance ECR.This study presents a novel high-performance perovskite catalyst for ECR andmay inspire the future design of electrocatalysts via the in operando formation of metal-metal oxide interfaces. 展开更多
关键词 electrochemical CO_(2)reduction faradaic efficiencies interfaces perovskite oxides
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Perovskite Oxides La0.8Sr0.2Co1-xFexO3 for CO Oxidation and CO+NO Reduction: Effect of Redox Property and Surface Morphology 被引量:2
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作者 YU Ke DIAO Tingting +1 位作者 ZHU Junjiang ZHAO Zhen 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2018年第1期119-126,共8页
This work aims to study the effect of redox property and surface morphology of perovskite oxides on the catalytic activity of CO oxidation and CO+NO reduction, with the redox property being tuned by doping Fe at the ... This work aims to study the effect of redox property and surface morphology of perovskite oxides on the catalytic activity of CO oxidation and CO+NO reduction, with the redox property being tuned by doping Fe at the Co site of La0.8Sr0.2Co1-xFexO3 and the surface morphology being modified by supporting La0.8Sr0.2CoO3 on various mesoporous silicas(i.e., SBA-16, SBA-15, MCF). Characteristic results show that the Fe doping improves the match of redox potentials, and SBA-16 is the best support of La0.8Sr0.2CoO3 when referring to the oxidation ability(e.g., the Co^3+/Co^2+ molar ratio). A mechanism for oxygen desorption from perovskite oxides is proposed based on O2-TPD experiments, showing the evolution process of oxygen released from oxygen vacancy and lattice framework. Catalytic tests indicate that La0.8Sr0.2CoO3 is the best for CO oxidation, and La0.8Sr0.2FeO3 is the best for CO+NO reduction. The mechanism of CO+NO reduction changes as the reaction temperature increases, with XNO/XCO value decreases from 2.4 at 250℃ to 1.0 at 400℃. As for the surface morphology, La0. Sr0.2CoO3 supported on SBA-16 possesses the highest surface Co^3+/Co^2+ molar ratio as compared to the other two, and shows the best activity for CO oxidation. 展开更多
关键词 perovskite oxide Redox property Surface morphology Mesoporous silica CO oxidation CO+NO reduction
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Discovery of orthorhombic perovskite oxides with low thermal conductivity by first-principles calculations 被引量:1
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作者 Yuchen LIU Kaili CHU +3 位作者 Yu ZHOU Yiran LI Wenxian LI Bin LIU 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2022年第10期1596-1603,共8页
Orthorhombic perovskite oxides are studied by high-throughput first-principles calculations to explore new thermal barrier coating(TBC)materials with low thermal conductivities.The mechanical and thermal properties ar... Orthorhombic perovskite oxides are studied by high-throughput first-principles calculations to explore new thermal barrier coating(TBC)materials with low thermal conductivities.The mechanical and thermal properties are predicted for 160 orthorhombic perovskite oxides.The average atomic volume is identified as a possible predictor of the thermal conductivity for the perovskite oxides,as it has a good correlation with the thermal conductivity.Five compounds,i.e.,LaTmO_(3),LaErO_(3),LaHoO_(3),SrCeO_(3),and SrPrO_(3),having thermal conductivities under 1 W·m^(-1)·K^(-1) and good damage tolerance,are proposed as novel TBC materials.The obtained data are expected to inspire the design of perovskite oxide-based TBC materials and also support their future functionality investigations. 展开更多
关键词 first-principles calculations perovskite oxide thermal conductivity mechanical property
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Nanostructured perovskite oxides as promising substitutes of noble metals catalysts for catalytic combustion of methane 被引量:13
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作者 Ji Yang Yanbing Guo 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第2期252-260,共9页
Heterogeneous catalytic combustion provides a feasible technique for high efficient methane utilization.Perovskites ABO_3-type materials have received renewed attention as a potential alternative for noble metals supp... Heterogeneous catalytic combustion provides a feasible technique for high efficient methane utilization.Perovskites ABO_3-type materials have received renewed attention as a potential alternative for noble metals supported catalysts in catalytic methane combustion due to excellent hydrothermal stability and sulfur resistance. Recently, the emergence of nanostructured perovskite oxides(such as threedimensional ordered nanostructure, nano-array structure) with outstanding catalytic activity has further driven methane catalytic combustion research into spotlight. In this review, we summarize the recent development of nanostructured perovskite oxide catalysts for methane combustion, and shed some light on the rational design of high efficient nanostructured perovskite catalysts via lattice oxygen activation,lattice oxygen mobility and materials morphology engineering. The emergent issues needed to be addressed on perovskite catalysts were also proposed. 展开更多
关键词 Nanostructured perovskites Mesoporous and macroporous Nano-array catalysts Methane oxidation Catalytic combustion
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Rapid and durable oxygen reduction reaction enabled by a perovskite oxide with self-cleaning surface
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作者 Shengli Pang Yifan Song +7 位作者 Meng Cui Xin Tang Chao Long Lingfeng Ke Gongmei Yang Ting Fang Yong Guan Chonglin Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第8期333-340,I0010,共9页
The growth of electrochemically inert segregation layers on the surface of solid oxide fuel cell cathodes has become a bottleneck restricting the development of perovskite-structured oxygen reduction catalysts.Here,we... The growth of electrochemically inert segregation layers on the surface of solid oxide fuel cell cathodes has become a bottleneck restricting the development of perovskite-structured oxygen reduction catalysts.Here,we report a new discovery in which enriched Ba and Fe ions on the near-surface of Nd_(1/2)Ba_(1/2)Co_(1/3)Fe_(1/3)Mn_(1/3)O_(3-δ)spontaneously agglomerate into dispersed Ba_(5)Fe_(2)O_(8) nanoparticles and maintain a highly active and durable perovskite structure on the surface.This unique surface selfcleaning phenomenon is related to the low average potential energy of Ba_(5)Fe_(2)O_(8),which is grown on the near-surface layer.The electrochemically inert Ba_(5)Fe_(2)O_(8) segregation layer on the near-surface of the perovskite catalyst achieves self-cleaning by regulating the formation energy of enriched metal oxides.This self-cleaned perovskite surface exhibits an ultrafast oxygen exchange rate,high catalytic activity for the oxygen reduction reaction,and good adaptability to the actual working conditions of solid oxide fuel cell stacks.This study paves a new way for overcoming the stubborn problem of perovskite catalyst surface deactivation and enriches the scientific knowledge of surface catalysis. 展开更多
关键词 Surface chemistry Energy materials ELECTROCATALYSIS perovskite oxide Oxygen reduction reaction Solid oxide fuel cells
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The Crystal Structure Study of CaSrFe0.75Co0.75Mn0.5O6−δ by Neutron Diffraction
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作者 Amara Martinson Mandy Guinn Ram Krishna Hona 《Journal of Materials Science and Chemical Engineering》 2024年第1期29-35,共7页
The crystal structure of CaSrFe<sub>0.75</sub>Co<sub>0.75</sub>Mn<sub>0.5</sub>O<sub>6−δ</sub> is investigated through neutron diffraction techniques in this study. The... The crystal structure of CaSrFe<sub>0.75</sub>Co<sub>0.75</sub>Mn<sub>0.5</sub>O<sub>6−δ</sub> is investigated through neutron diffraction techniques in this study. The material is synthesized using a solid-state synthesis method at a temperature of 1200˚C. Neutron diffraction data is subjected to Rietveld refinement, and a comparative analysis with X-ray diffraction (XRD) data is performed to unravel the structural details of the material. The findings reveal that the synthesized material exhibits a cubic crystal structure with a Pm-3m phase. The neutron diffraction results offer valuable insights into the arrangement of atoms within the lattice, contributing to a comprehensive understanding of the material’s structural properties. This research enhances our knowledge of CaSrFe0.75</sub>Co0.75</sub>Mn0.5</sub>O6−δ</sub>, with potential implications for its applications in various technological and scientific domains. 展开更多
关键词 XRD Neutron Diffraction perovskite oxides Crystal Structure Solid-State Reaction
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