钠离子电池(sodium-ion batteries,SIBs)具有成本低的潜在优势,有望成为替代锂离子电池(lithium ion batteries,LIBs)的储能设备。为提升钠离子电池的性能,开发出适应钠离子脱嵌的负极材料尤为重要。硫化锑(Sb_(2)S_(3))因其理论比容量...钠离子电池(sodium-ion batteries,SIBs)具有成本低的潜在优势,有望成为替代锂离子电池(lithium ion batteries,LIBs)的储能设备。为提升钠离子电池的性能,开发出适应钠离子脱嵌的负极材料尤为重要。硫化锑(Sb_(2)S_(3))因其理论比容量高被认为是较好的钠离子电池负极材料。本文使用简单水热法将Sb_(2)S_(3)与石墨烯复合,制备Sb_(2)S_(3)/石墨烯复合材料(Sb_(2)S_(3)/Gr)。结果表明:Sb_(2)S_(3)/Gr作为钠离子电池负极时,不仅表现出良好的电导率(3.5×10~(-3)S/cm)和钠离子扩散速率(4.853×10~(-13)cm~2/s),而且在0.5 A/g的电流密度下,首圈库伦效率为76.27%,经150次循环后的比容量稳定在488 m A·h/g,表现出较高的比容量。Sb_(2)S_(3)/Gr复合材料表现出了极大的应用潜力,为高性能钠离子电池负极材料的研发提供了一定的参考价值。展开更多
通过探索一系列静电纺丝-硫化-煅烧等工艺参数,制备了N-掺杂碳纤维复合Sb_(2)S_(3)柔性电极材料(Sb_(2)S_(3)/NC),并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等对样品的晶体结构、微观...通过探索一系列静电纺丝-硫化-煅烧等工艺参数,制备了N-掺杂碳纤维复合Sb_(2)S_(3)柔性电极材料(Sb_(2)S_(3)/NC),并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等对样品的晶体结构、微观形貌及化学组成等进行了表征.制备的Sb_(2)S_(3)/NC纳米纤维具有优异的机械柔性和独特的复合结构.30 nm大小的Sb_(2)S_(3)纳米粒子相互连接成串珠状形貌,均匀地分散在N-掺杂碳纳米纤维中,有利于提高电子/离子的传输速率和电极材料的循环稳定性.Sb_(2)S_(3)/NC作为负极材料直接组装成的钠离子电池显示出优异的电化学性能,电流密度0.1和2.0 A g^(-1)下,比容量分别达到476.5和266.2 mAh g^(-1),0.1 A g^(-1)下循环280次后比容量保持为466.3 mAh g^(-1).展开更多
对NaCl-KCl、NaCl-CaCl_(2)、NaCl-Na_(2)CO_(3)、NaCl-KCl-CaCl_(2)和NaCl-KCl-Na_(2)CO_(3)熔盐体系开展比较分析,研究不同熔盐体系的相图、热稳定性和硫化锑的溶解度。根据锑元素分布特征、电流效率、能耗及熔渣成分表征结果,优选出...对NaCl-KCl、NaCl-CaCl_(2)、NaCl-Na_(2)CO_(3)、NaCl-KCl-CaCl_(2)和NaCl-KCl-Na_(2)CO_(3)熔盐体系开展比较分析,研究不同熔盐体系的相图、热稳定性和硫化锑的溶解度。根据锑元素分布特征、电流效率、能耗及熔渣成分表征结果,优选出适合Sb_(2)S_(3)电解还原的熔盐体系。结果表明,所有熔盐体系均具有良好热稳定性,且可实现Sb_(2)S_(3)的电解还原。添加CaCl_(2)的体系不利于Sb_(2)S_(3)溶解,而添加Na_(2)CO_(3)的体系会与Sb_(2)S_(3)发生反应。此外,NaCl-KCl体系的电流效率最高(75.68%),且能耗最低(2.18 k W·h/kg)。展开更多
Antimony sulfide–selenide Sb2（S,Se）3,including Sb2S3and Sb2Se3,can be regarded as binary metal chalcogenides semiconductors since Sb2S3and Sb2Se3are isomorphous.They possess abundant elemental storage,nontoxicity,g...Antimony sulfide–selenide Sb2（S,Se）3,including Sb2S3and Sb2Se3,can be regarded as binary metal chalcogenides semiconductors since Sb2S3and Sb2Se3are isomorphous.They possess abundant elemental storage,nontoxicity,good stability with regard to moisture at elevated temperatures and suitable physical parameters for light absorption materials in solar cells.To date,quite a few attempts have been conducted in the materials synthesis,photovoltaic property investigation and device fabrication.Benefiting from previous investigation in thin film solar cells and new generation nanostructured solar cells,this class of materials has been applied in either sensitized-architecture or planar heterojunction solar cells.Decent power conversion efficiencies from 5%to 7.5%have been achieved.Apparently,further improvement on the efficiency is required for future practical applications.To give an overview of this research field,this paper displays some typical researches regarding the methodologies toward the antimony sulfide–selenide synthesis,development of interfacial materials and device fabrications,during which we highlight some critical findings that promote the efficiency enhancement.Finally,this paper proposes some outstanding issue regarding fundamental understanding of the materials,some viewpoints for the efficiency improvement and their future challenges in solar cell applications.展开更多
Novel chalcogenide glasses of pseudo-binary(100-x)Sb_(2)S_(3-x)CuI systems were synthesized by traditional meltquenching method.The glass-forming region of Sb_(2)S_(3)-CuI system was determined ranging from x=30 mol% ...Novel chalcogenide glasses of pseudo-binary(100-x)Sb_(2)S_(3-x)CuI systems were synthesized by traditional meltquenching method.The glass-forming region of Sb_(2)S_(3)-CuI system was determined ranging from x=30 mol% to 40 mol%.CuI acts as a non-bridging modifier to form appropriate amount of [SbSI] structural units for improving the glass-forming ability of Sb_(2)S_(3).Particularly,as-prepared glassy sample is able to transmit light beyond 14 μm,which is the wider transparency region than most sulfide glasses.Their physical properties,including Vickers hardness(Hv),density(ρ),and ionic conductivity(σ) were characterized and analyzed with the compositional-dependent Raman spectra.These experimental results would provide useful knowledge for the development of novel multi-spectral optical materials and glassy electrolytes.展开更多
Antimony sulfide(Sb_(2)S_(3))is an appealing semiconductor as light absorber for solar cells due to its high absorption coefficient,appropriate band gap(~1.7 e V)and abundance of constituent elements.However,power con...Antimony sulfide(Sb_(2)S_(3))is an appealing semiconductor as light absorber for solar cells due to its high absorption coefficient,appropriate band gap(~1.7 e V)and abundance of constituent elements.However,power conversion efficiency(PCE)of Sb_(2)S_(3)-based solar cells still lags much behind the theoretically predicted due to the imperfect energy level alignment at the charge transporting layer/Sb_(2)S_(3)interfaces and hence severe charge recombination.Herein,we insert a high-temperature sintered magnesium(Mg)-doped tin oxide(SnO_(2))layer between cadmium sulfide(Cd S)and fuorine doped tin oxide to form a cascaded energy level alignment and thus mitigate interfacial charge recombination.Simultaneously,the inserted Mg-doped Sn O_(2)buffer layer facilitates the growth of the neibouring Cd S film with orientation followed by Sb_(2)S_(3)film with larger grains and fewer pinholes.Consequently,the resultant Sb_(2)S_(3)solar cells with Mg-doped SnO_(2)deliver a champion PCE of 6.31%,22.8%higher than those without a buffer layer.Our work demonstrates that deliberate absorber growth as well as efficient hole blocking upon an appropriate buffer layer is viable in obtaining solution-processed Sb_(2)S_(3)solar cells with high performance.展开更多
The rapid development of portable,foldable,and wearable electronic devices requires flexible energy storage systems.Sodiumion capacitors(SICs)combining the high energy of batteries and the high power of supercapacitor...The rapid development of portable,foldable,and wearable electronic devices requires flexible energy storage systems.Sodiumion capacitors(SICs)combining the high energy of batteries and the high power of supercapacitors are promising solutions.However,the lack of flexible and durable electrode materials that allow fast and reversible Na+storage hinders the development of flexible SICs.Herein,we report a high-capacity,free-standing and flexible Sb2S3/Ti_(3)C_(2)Tx composite film for fast and stable sodium storage.In this hybrid nano-architecture,the Sb_(2)S_(3)nanowires uniformly anchored between Ti_(3)C_(2)Tx nanosheets not only act as sodium storage reservoirs but also pillar the two-dimensional(2D)Ti_(3)C_(2)Tx to form three-dimensional(3D)channels benefiting for electrolyte penetration.Meanwhile,the highly conductive Ti_(3)C_(2)Tx nanosheets provide rapid electron transport pathways,confine the volume expansion of Sb_(2)S_(3)during sodiation,and restrain the dissolution of discharged sodium polysulfides through physical constraint and chemical absorption.Owing to the synergistic effects of the one-dimensional(1D)Sb_(2)S_(3)nanowires and 2D MXenes,the resultant composite anodes exhibit outstanding rate performance(553 mAh·g−1 at 2 A·g−1)and cycle stability in sodium-ion batteries.Moreover,the flexible SICs using Sb2S3/Ti_(3)C_(2)Tx anodes and active carbon/reduced graphene oxide(AC/rGO)paper cathodes deliver a superior energy and power density in comparison with previously reported devices,as well as an excellent cycling performance with a high capacity retention of 82.78%after 5,000 cycles.This work sheds light on the design of next-generation low-cost,flexible and fast-charging energy storage devices.展开更多
硒化锑(Sb_(2)Se_(3))属于窄带隙半导体材料,具有良好的光吸收特性,已逐渐应用于光电催化领域.独特的一维(Sb_(4)Se_(6))_(n)带状结构单元连接方式,使其载流子传输具有高度各向异性.本文通过气相输运沉积法和原位水热法成功构建了还原...硒化锑(Sb_(2)Se_(3))属于窄带隙半导体材料,具有良好的光吸收特性,已逐渐应用于光电催化领域.独特的一维(Sb_(4)Se_(6))_(n)带状结构单元连接方式,使其载流子传输具有高度各向异性.本文通过气相输运沉积法和原位水热法成功构建了还原氧化石墨烯(rGO)修饰的准一维Sb_(2)Se_(3)@In_(2)S_(3)光陷阱异质结.研究结果表明,在rGO空间限域效应下,原位生长的非层状In_(2)S_(3)纳米片厚度从30 nm减小到10 nm,显著增加了光电极的电化学活性比表面积,进一步增强了光陷阱纳米结构对光的捕获能力.rGO和超薄In_(2)S_(3)纳米片共同修饰的准一维毛刷状Sb_(2)Se_(3)@In_(2)S_(3)-rGO纳米棒光电极在0 V(相对于可逆氢电极)的外加偏压下,光电流密度可达1.169 m A cm^(-2),约是Sb_(2)Se_(3)@In_(2)S_(3)和单体Sb_(2)Se_(3)的2倍和16倍,且稳定性良好,在中性条件下平均产氢速率为16.59μmol cm^(-2)h^(-1).实验结果和理论计算均表明,Ⅱ型异质结电荷传输方式是其光电化学增强的物理机制.以上工作为设计基于rGO修饰的复合光电极用于光电化学领域的研究提供了崭新的思路.展开更多
Owing to excellent conductivity and abundant surface terminals,MXene-based heterostructures have been intensively investigated as energy storage materials.However,elaborate design of the structure and composition of M...Owing to excellent conductivity and abundant surface terminals,MXene-based heterostructures have been intensively investigated as energy storage materials.However,elaborate design of the structure and composition of MXene-based hybrids towards superior electrochemical performance is still challenging.Herein,we present an ingenious leaf-inspired design for preparing a unique Sb_(2)S_(3)/nitrogen-doped Ti_(3)C_(2)T_(x)MXene(L-Sb_(2)S_(3)/Ti_(3)C_(2))hybrid.In-situ TEM observations reveal that the leaflike Sb_(2)S_(3)nanoparticles with numerous mesopores can well relieve the large volume changes via an inward pore filling mechanism with only 20%outward expansion,whereas highly conductive N-doped Ti_(3)C_(2)T_(x)nanosheets can serve as the robust mechanical support to reinforce the structural integrity of the hybrid.Benefiting from the structural and constituent merits,the L-Sb_(2)S_(3)/Ti_(3)C_(2)anode fabricated exhibits a fast sodium storage behavior in terms of outstanding rate capability(339.5 mA h g^(-1)at 2,000 mA g^(-1))and high reversible capacity at high current density(358.2 mA h g^(-1)at 1,000 mA g^(-1)after 100 cycles).Electrochemical kinetic tests and theoretical simulation further manifest that the boosted electrochemical performance mainly arises from such a unique leaf-like Sb_(2)S_(3)mesoporous nanostructure with abundant active sites,and enhanced Na^(+)adsorption energy on the heterojunction formed between Sb_(2)S_(3)nanoparticles and Ti_(3)C_2)matrix.展开更多
金属硫化物有着较高的理论容量,是钠离子电池极具潜力的负极材料.然而,这类材料在电化学反应过程中存在体积膨胀和反应动力学缓慢的缺点,使得其循环和倍率性能较差.本文通过在Sb_(2)S_(3)纳米棒上直接生长SnS_(2)纳米片并在其表面进一...金属硫化物有着较高的理论容量,是钠离子电池极具潜力的负极材料.然而,这类材料在电化学反应过程中存在体积膨胀和反应动力学缓慢的缺点,使得其循环和倍率性能较差.本文通过在Sb_(2)S_(3)纳米棒上直接生长SnS_(2)纳米片并在其表面进一步包裹碳膜,制备了Sb_(2)S_(3)/SnS_(2)/C异质结构.这种异质结构极大地提高了材料的稳定性,并促进了离子和电子的运输.研究结果表明,在六氟磷酸钠/二乙二醇二甲醚电解质体系中充放电循环600次后,Sb_(2)S_(3)/SnS_(2)/C复合电极材料在电流密度为1 A g^(−1)时表现出642 mA h g^(−1)的高可逆容量,并且在4 A g^(−1)时仍保留367.3 mA h g^(−1)的良好的倍率性能.此外,为了研究该材料的电化学性能,本工作进一步探讨了钠离子在几种不同的电极材料和电解质中的扩散过程.综上所述,Sb_(2)S_(3)/SnS_(2)/C异质结材料有望成为一种拥有广阔应用前景的钠离子电池负极材料.展开更多
Sb_(2)S_(3)is a promising candidate for the flexible solar cells or the top subcells in tandem solar cells due to its wide-bandgap,less toxic,acceptable cost and progressive power conversion efficiency(PCE).However,th...Sb_(2)S_(3)is a promising candidate for the flexible solar cells or the top subcells in tandem solar cells due to its wide-bandgap,less toxic,acceptable cost and progressive power conversion efficiency(PCE).However,the poor quality and high trap states of Sb_(2)S_(3)films limit the device performance further enhancement.Herein,we adopt a multidentate ionic liquid,tetramethylammonium hexafluorophosphate([TMA][PF_(6)])as a novel additive to address this issue.The octahedral[PF_(6)]~-contains six different oriented fluorine atoms with the lone pair electrons,which could coordinate with Sb atoms due to the multidentate anchoring.Thus,the high-quality Sb_(2)S_(3)film with low trap states has been achieved.Moreover,the Fermi level of the Sb_(2)S_(3)film has been upshifted,thereby showing an effective charge transfer.As a result,all photovoltaic parameters of the optimized Sb_(2)S_(3)devices are obviously enhanced,boosting the final PCE from 4.43(control device)to 6.83%.Our study about the multidentate anchoring is manifested to be an effective method to enhance the Sb_(2)S_(3)device performance.展开更多
文摘钠离子电池(sodium-ion batteries,SIBs)具有成本低的潜在优势,有望成为替代锂离子电池(lithium ion batteries,LIBs)的储能设备。为提升钠离子电池的性能,开发出适应钠离子脱嵌的负极材料尤为重要。硫化锑(Sb_(2)S_(3))因其理论比容量高被认为是较好的钠离子电池负极材料。本文使用简单水热法将Sb_(2)S_(3)与石墨烯复合,制备Sb_(2)S_(3)/石墨烯复合材料(Sb_(2)S_(3)/Gr)。结果表明:Sb_(2)S_(3)/Gr作为钠离子电池负极时,不仅表现出良好的电导率(3.5×10~(-3)S/cm)和钠离子扩散速率(4.853×10~(-13)cm~2/s),而且在0.5 A/g的电流密度下,首圈库伦效率为76.27%,经150次循环后的比容量稳定在488 m A·h/g,表现出较高的比容量。Sb_(2)S_(3)/Gr复合材料表现出了极大的应用潜力,为高性能钠离子电池负极材料的研发提供了一定的参考价值。
文摘通过探索一系列静电纺丝-硫化-煅烧等工艺参数,制备了N-掺杂碳纤维复合Sb_(2)S_(3)柔性电极材料(Sb_(2)S_(3)/NC),并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)等对样品的晶体结构、微观形貌及化学组成等进行了表征.制备的Sb_(2)S_(3)/NC纳米纤维具有优异的机械柔性和独特的复合结构.30 nm大小的Sb_(2)S_(3)纳米粒子相互连接成串珠状形貌,均匀地分散在N-掺杂碳纳米纤维中,有利于提高电子/离子的传输速率和电极材料的循环稳定性.Sb_(2)S_(3)/NC作为负极材料直接组装成的钠离子电池显示出优异的电化学性能,电流密度0.1和2.0 A g^(-1)下,比容量分别达到476.5和266.2 mAh g^(-1),0.1 A g^(-1)下循环280次后比容量保持为466.3 mAh g^(-1).
基金the financial supports from the National Natural Science Foundation of China(No.52074362)。
文摘对NaCl-KCl、NaCl-CaCl_(2)、NaCl-Na_(2)CO_(3)、NaCl-KCl-CaCl_(2)和NaCl-KCl-Na_(2)CO_(3)熔盐体系开展比较分析,研究不同熔盐体系的相图、热稳定性和硫化锑的溶解度。根据锑元素分布特征、电流效率、能耗及熔渣成分表征结果,优选出适合Sb_(2)S_(3)电解还原的熔盐体系。结果表明,所有熔盐体系均具有良好热稳定性,且可实现Sb_(2)S_(3)的电解还原。添加CaCl_(2)的体系不利于Sb_(2)S_(3)溶解,而添加Na_(2)CO_(3)的体系会与Sb_(2)S_(3)发生反应。此外,NaCl-KCl体系的电流效率最高(75.68%),且能耗最低(2.18 k W·h/kg)。
基金Projects(41977129,21607176,42007138) supported by the National Natural Science Foundation of ChinaProject(kq1802011) supported by the Changsha Outstanding Innovative Youth Training Program,ChinaProject(2017JJ3516)supported by the Natural Science Foundation of Hunan Province,China。
基金supported by the Recruitment Program of Global Expertsthe Fundamental Research Funds for the Central Universities(Nos.WK2060140022,WK2060140023 and WK2060140024)
文摘Antimony sulfide–selenide Sb2（S,Se）3,including Sb2S3and Sb2Se3,can be regarded as binary metal chalcogenides semiconductors since Sb2S3and Sb2Se3are isomorphous.They possess abundant elemental storage,nontoxicity,good stability with regard to moisture at elevated temperatures and suitable physical parameters for light absorption materials in solar cells.To date,quite a few attempts have been conducted in the materials synthesis,photovoltaic property investigation and device fabrication.Benefiting from previous investigation in thin film solar cells and new generation nanostructured solar cells,this class of materials has been applied in either sensitized-architecture or planar heterojunction solar cells.Decent power conversion efficiencies from 5%to 7.5%have been achieved.Apparently,further improvement on the efficiency is required for future practical applications.To give an overview of this research field,this paper displays some typical researches regarding the methodologies toward the antimony sulfide–selenide synthesis,development of interfacial materials and device fabrications,during which we highlight some critical findings that promote the efficiency enhancement.Finally,this paper proposes some outstanding issue regarding fundamental understanding of the materials,some viewpoints for the efficiency improvement and their future challenges in solar cell applications.
基金Project partially supported by the National Key Research and Development Program of China(Grant Nos.2016YFB0303802 and 2016YFB0303803)the National Natural Science Foundation of China(Grant No.61775110)sponsored by K C Wong Magna Fund in Ningbo University。
文摘Novel chalcogenide glasses of pseudo-binary(100-x)Sb_(2)S_(3-x)CuI systems were synthesized by traditional meltquenching method.The glass-forming region of Sb_(2)S_(3)-CuI system was determined ranging from x=30 mol% to 40 mol%.CuI acts as a non-bridging modifier to form appropriate amount of [SbSI] structural units for improving the glass-forming ability of Sb_(2)S_(3).Particularly,as-prepared glassy sample is able to transmit light beyond 14 μm,which is the wider transparency region than most sulfide glasses.Their physical properties,including Vickers hardness(Hv),density(ρ),and ionic conductivity(σ) were characterized and analyzed with the compositional-dependent Raman spectra.These experimental results would provide useful knowledge for the development of novel multi-spectral optical materials and glassy electrolytes.
基金supported by the National Natural Science Foundation of China(Grant Nos.62074117,61904126)the Natural Science Foundation of Hubei Province,China(Grant Nos.2019AAA020,2019CFB122)+2 种基金the Natural Science Foundation of Guangdong Province(2021A1515012594)Guangdong Province Office of Education(2020ZDZX2028)the Special Funds for the Development of Strategic Emerging Industries in Shenzhen(JCYJ20190808152609307)。
文摘Antimony sulfide(Sb_(2)S_(3))is an appealing semiconductor as light absorber for solar cells due to its high absorption coefficient,appropriate band gap(~1.7 e V)and abundance of constituent elements.However,power conversion efficiency(PCE)of Sb_(2)S_(3)-based solar cells still lags much behind the theoretically predicted due to the imperfect energy level alignment at the charge transporting layer/Sb_(2)S_(3)interfaces and hence severe charge recombination.Herein,we insert a high-temperature sintered magnesium(Mg)-doped tin oxide(SnO_(2))layer between cadmium sulfide(Cd S)and fuorine doped tin oxide to form a cascaded energy level alignment and thus mitigate interfacial charge recombination.Simultaneously,the inserted Mg-doped Sn O_(2)buffer layer facilitates the growth of the neibouring Cd S film with orientation followed by Sb_(2)S_(3)film with larger grains and fewer pinholes.Consequently,the resultant Sb_(2)S_(3)solar cells with Mg-doped SnO_(2)deliver a champion PCE of 6.31%,22.8%higher than those without a buffer layer.Our work demonstrates that deliberate absorber growth as well as efficient hole blocking upon an appropriate buffer layer is viable in obtaining solution-processed Sb_(2)S_(3)solar cells with high performance.
基金C.Y.W.appreciates the support from a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.G.X.W.and X.G.would like to acknowledge the support by the Australian Research Council(ARC)through the ARC Research Hub for Integrated Energy Storage Solutions(No.IH180100020).
文摘The rapid development of portable,foldable,and wearable electronic devices requires flexible energy storage systems.Sodiumion capacitors(SICs)combining the high energy of batteries and the high power of supercapacitors are promising solutions.However,the lack of flexible and durable electrode materials that allow fast and reversible Na+storage hinders the development of flexible SICs.Herein,we report a high-capacity,free-standing and flexible Sb2S3/Ti_(3)C_(2)Tx composite film for fast and stable sodium storage.In this hybrid nano-architecture,the Sb_(2)S_(3)nanowires uniformly anchored between Ti_(3)C_(2)Tx nanosheets not only act as sodium storage reservoirs but also pillar the two-dimensional(2D)Ti_(3)C_(2)Tx to form three-dimensional(3D)channels benefiting for electrolyte penetration.Meanwhile,the highly conductive Ti_(3)C_(2)Tx nanosheets provide rapid electron transport pathways,confine the volume expansion of Sb_(2)S_(3)during sodiation,and restrain the dissolution of discharged sodium polysulfides through physical constraint and chemical absorption.Owing to the synergistic effects of the one-dimensional(1D)Sb_(2)S_(3)nanowires and 2D MXenes,the resultant composite anodes exhibit outstanding rate performance(553 mAh·g−1 at 2 A·g−1)and cycle stability in sodium-ion batteries.Moreover,the flexible SICs using Sb2S3/Ti_(3)C_(2)Tx anodes and active carbon/reduced graphene oxide(AC/rGO)paper cathodes deliver a superior energy and power density in comparison with previously reported devices,as well as an excellent cycling performance with a high capacity retention of 82.78%after 5,000 cycles.This work sheds light on the design of next-generation low-cost,flexible and fast-charging energy storage devices.
基金supported by the National Natural Science Foundation of China(11974276,11804274,and 22078261)。
文摘硒化锑(Sb_(2)Se_(3))属于窄带隙半导体材料,具有良好的光吸收特性,已逐渐应用于光电催化领域.独特的一维(Sb_(4)Se_(6))_(n)带状结构单元连接方式,使其载流子传输具有高度各向异性.本文通过气相输运沉积法和原位水热法成功构建了还原氧化石墨烯(rGO)修饰的准一维Sb_(2)Se_(3)@In_(2)S_(3)光陷阱异质结.研究结果表明,在rGO空间限域效应下,原位生长的非层状In_(2)S_(3)纳米片厚度从30 nm减小到10 nm,显著增加了光电极的电化学活性比表面积,进一步增强了光陷阱纳米结构对光的捕获能力.rGO和超薄In_(2)S_(3)纳米片共同修饰的准一维毛刷状Sb_(2)Se_(3)@In_(2)S_(3)-rGO纳米棒光电极在0 V(相对于可逆氢电极)的外加偏压下,光电流密度可达1.169 m A cm^(-2),约是Sb_(2)Se_(3)@In_(2)S_(3)和单体Sb_(2)Se_(3)的2倍和16倍,且稳定性良好,在中性条件下平均产氢速率为16.59μmol cm^(-2)h^(-1).实验结果和理论计算均表明,Ⅱ型异质结电荷传输方式是其光电化学增强的物理机制.以上工作为设计基于rGO修饰的复合光电极用于光电化学领域的研究提供了崭新的思路.
基金supported by the National Natural Science Foundation of China (22005293, U19A2092 and 22275180)the National Key Research and Development Program of China (2019YFA0405600)+1 种基金the Institute of Energy, Hefei Comprehensive National Science Center (21KZS212)the Collaborative Innovation Program of Hefei Science Center, CAS。
基金This work was supported by the Shuguang Program from Shanghai Education Development Foundation and Shanghai Municipal Education Commission(18SG035)State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,Donghua University(KF2015).Dr.Q.Zhang thanks the support by the National Natural Science Foundation of China(52072323,51872098).
文摘Owing to excellent conductivity and abundant surface terminals,MXene-based heterostructures have been intensively investigated as energy storage materials.However,elaborate design of the structure and composition of MXene-based hybrids towards superior electrochemical performance is still challenging.Herein,we present an ingenious leaf-inspired design for preparing a unique Sb_(2)S_(3)/nitrogen-doped Ti_(3)C_(2)T_(x)MXene(L-Sb_(2)S_(3)/Ti_(3)C_(2))hybrid.In-situ TEM observations reveal that the leaflike Sb_(2)S_(3)nanoparticles with numerous mesopores can well relieve the large volume changes via an inward pore filling mechanism with only 20%outward expansion,whereas highly conductive N-doped Ti_(3)C_(2)T_(x)nanosheets can serve as the robust mechanical support to reinforce the structural integrity of the hybrid.Benefiting from the structural and constituent merits,the L-Sb_(2)S_(3)/Ti_(3)C_(2)anode fabricated exhibits a fast sodium storage behavior in terms of outstanding rate capability(339.5 mA h g^(-1)at 2,000 mA g^(-1))and high reversible capacity at high current density(358.2 mA h g^(-1)at 1,000 mA g^(-1)after 100 cycles).Electrochemical kinetic tests and theoretical simulation further manifest that the boosted electrochemical performance mainly arises from such a unique leaf-like Sb_(2)S_(3)mesoporous nanostructure with abundant active sites,and enhanced Na^(+)adsorption energy on the heterojunction formed between Sb_(2)S_(3)nanoparticles and Ti_(3)C_2)matrix.
基金supported by the National Natural Science Foundation of China(51972025)。
文摘金属硫化物有着较高的理论容量,是钠离子电池极具潜力的负极材料.然而,这类材料在电化学反应过程中存在体积膨胀和反应动力学缓慢的缺点,使得其循环和倍率性能较差.本文通过在Sb_(2)S_(3)纳米棒上直接生长SnS_(2)纳米片并在其表面进一步包裹碳膜,制备了Sb_(2)S_(3)/SnS_(2)/C异质结构.这种异质结构极大地提高了材料的稳定性,并促进了离子和电子的运输.研究结果表明,在六氟磷酸钠/二乙二醇二甲醚电解质体系中充放电循环600次后,Sb_(2)S_(3)/SnS_(2)/C复合电极材料在电流密度为1 A g^(−1)时表现出642 mA h g^(−1)的高可逆容量,并且在4 A g^(−1)时仍保留367.3 mA h g^(−1)的良好的倍率性能.此外,为了研究该材料的电化学性能,本工作进一步探讨了钠离子在几种不同的电极材料和电解质中的扩散过程.综上所述,Sb_(2)S_(3)/SnS_(2)/C异质结材料有望成为一种拥有广阔应用前景的钠离子电池负极材料.
基金financially supported by the Basic Research Fund for Free Exploration in Shenzhen(No.JCYJ20180306171402878)the National Natural Science Foundation of China(No.52072228,51571166 and 21603175)the Fundamental Research Funds for the Central Universities(No.3102019JC005)。
文摘Sb_(2)S_(3)is a promising candidate for the flexible solar cells or the top subcells in tandem solar cells due to its wide-bandgap,less toxic,acceptable cost and progressive power conversion efficiency(PCE).However,the poor quality and high trap states of Sb_(2)S_(3)films limit the device performance further enhancement.Herein,we adopt a multidentate ionic liquid,tetramethylammonium hexafluorophosphate([TMA][PF_(6)])as a novel additive to address this issue.The octahedral[PF_(6)]~-contains six different oriented fluorine atoms with the lone pair electrons,which could coordinate with Sb atoms due to the multidentate anchoring.Thus,the high-quality Sb_(2)S_(3)film with low trap states has been achieved.Moreover,the Fermi level of the Sb_(2)S_(3)film has been upshifted,thereby showing an effective charge transfer.As a result,all photovoltaic parameters of the optimized Sb_(2)S_(3)devices are obviously enhanced,boosting the final PCE from 4.43(control device)to 6.83%.Our study about the multidentate anchoring is manifested to be an effective method to enhance the Sb_(2)S_(3)device performance.
