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Supporting IrO2 and IrRuOx nanoparticles on TiO2 and Nb-doped TiO2 nanotubes as electrocatalysts for the oxygen evolution reaction 被引量:3
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作者 Radostina V.Genova-Koleva Francisco Alcaide +4 位作者 Garbine Alvarez Pere L.Cabot Hans-Jürgen Grande María V.Martínez-Huerta Oscar Miguel 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第7期227-239,共13页
IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and character... IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and characterized by means of structural,surface analytical and electrochemical techniques.Nb doping of titania significantly increased the surface area of the support from 145(TNTs)to 260 m2g-1(Nb-TNTs),which was significantly higher than those of the Nb-doped titania supports previously reported in the literature.The surface analytical techniques showed good dispersion of the catalysts onto the supports.The X-ray photoelectron spectroscopy analyses showed that Nb was mainly in the form of Nb(IV)species,the suitable form to behave as a donor introducing free electrons to the conduction band of titania.The redox transitions of the cyclic voltammograms,in agreement with the XPS results,were found to be reversible.Despite the supported materials presented bigger crystallite sizes than the unsupported ones,the total number of active sites of the former was also higher due to their better catalyst dispersion.Considering the outer and the total charges of the cyclic voltammograms in the range 0.1–1.4 V,stability and electrode potentials at given current densities,the preferred catalyst was Ir O2 supported on the Nb-TNTs.The electrode potentials corresponding to given current densities were between the smallest ones given in the literature despite the small oxide loading used in this work and its Nb doping,thus making the Nb-TNTs-supported IrO2 catalyst a promising candidate for the OER.The good dispersion of IrO2,high specific surface area of the Nb-doped supports,accessibility of the electroactive centers,increased stability due to Nb doping and electron donor properties of the Nb(IV)oxide species were considered the main reasons for its good performance. 展开更多
关键词 Nb-doped TIO2 NANOTUBES IrO2 CATALYST IrRuOx CATALYST Oxygen evolution reaction PEMWE
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多孔TiC/TiO_2壳-芯复合物制备、表征分析及应用研究
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作者 闫巍 隋升 李斯琳 《电源技术》 CAS CSCD 北大核心 2010年第2期139-143,共5页
针对PEMWE阳极催化剂,对具有多孔结构和较高比表面积的纳米TiC采用控制氧化进程的方法,进行了表面物相和微孔结构改性,形成多孔结构的TiC-TiO2壳-芯复合物,并以处理后的TiO2-TiC原位复合物作为载体,制成了具有高活性的负载型催化剂。通... 针对PEMWE阳极催化剂,对具有多孔结构和较高比表面积的纳米TiC采用控制氧化进程的方法,进行了表面物相和微孔结构改性,形成多孔结构的TiC-TiO2壳-芯复合物,并以处理后的TiO2-TiC原位复合物作为载体,制成了具有高活性的负载型催化剂。通过X射线衍射光谱法(XRD),布鲁瑙尔-埃利特-特勒法(BET)和透射电子显微镜法(TEM)等多种表征方法,证明了改性后的TiC-TiO2比表面积比TiC增加了2倍以上,具有多矿相复合结构。循环伏安测试表明,Ir/TiC催化剂的析氧峰值电流是Ir黑的5倍,而经过改性后的TiC-TiO2负载的Ir催化剂则是Ir/TiC催化剂的析氧峰值电流的6倍。很明显改性后的TiO2-TiC原位复合物具有更大的比表面积和孔体积,更好地分散了贵金属Ir,大大提高了析氧反应的催化活性。 展开更多
关键词 TiO2-TiC壳-芯复合物 载体 阳极催化剂 质子交换膜水电解池(PEMWE) 负载催化剂
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A review of control strategies for proton exchange membrane(PEM)fuel cells and water electrolysers:From automation to autonomy
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作者 Jiahao Mao Zheng Li +3 位作者 Jin Xuan Xinli Du Meng Ni Lei Xing 《Energy and AI》 EI 2024年第3期470-486,共17页
Proton exchange membrane (PEM) based electrochemical systems have the capability to operate in fuel cell (PEMFC) and water electrolyser (PEMWE) modes, enabling efficient hydrogen energy utilisation and green hydrogen ... Proton exchange membrane (PEM) based electrochemical systems have the capability to operate in fuel cell (PEMFC) and water electrolyser (PEMWE) modes, enabling efficient hydrogen energy utilisation and green hydrogen production. In addition to the essential cell stacks, the system of PEMFC or PEMWE consists of four sub-systems for managing gas supply, power, thermal, and water, respectively. Due to the system's complexity, even a small fluctuation in a certain sub-system can result in an unexpected response, leading to a reduced performance and stability. To improve the system's robustness and responsiveness, considerable efforts have been dedicated to developing advanced control strategies. This paper comprehensively reviews various control strategies proposed in literature, revealing that traditional control methods are widely employed in PEMFC and PEMWE due to their simplicity, yet they suffer from limitations in accuracy. Conversely, advanced control methods offer high accuracy but are hindered by poor dynamic performance. This paper highlights the recent advancements in control strategies incorporating machine learning algorithms. Additionally, the paper provides a perspective on the future development of control strategies, suggesting that hybrid control methods should be used for future research to leverage the strength of both sides. Notably, it emphasises the role of artificial intelligence (AI) in advancing control strategies, demonstrating its significant potential in facilitating the transition from automation to autonomy. 展开更多
关键词 PEMFC PEMWE Control Management system AI
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Corrosion Investigation by Scanning Electrochemical Microscopy of AISI 446 and Ti-Coated AISI 446 Ferritic Stainless Steel as Potential Material for Bipolar Plate in PEMWE
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作者 Andrea Kellenberger Nicolae Vaszilcsin +4 位作者 Mircea Laurentiu Dan Ion Mitelea Alexandru Adrian Geana Sigrid Lædre Corneliu M.Craciunescu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2024年第4期607-619,共13页
The components of proton exchange membrane water electrolysers frequently experience corrosion issues, especially at high anodic polarization, that restrict the use of more affordable alternatives to titanium. Here, w... The components of proton exchange membrane water electrolysers frequently experience corrosion issues, especially at high anodic polarization, that restrict the use of more affordable alternatives to titanium. Here, we investigate localized corrosion processes of bare and Ti-coated AISI 446 ferritic stainless steel under anodic polarization by scanning electrochemical microscopy (SECM) in sodium sulphate and potassium chloride solutions. SECM approach curves and area scans measured at open-circuit potential (OCP) of the samples in the feedback mode using a redox mediator evidence a negative feedback effect caused by the surface passive film. For the anodic polarization of the sample, the substrate generation-tip collection mode enables to observe local generation of iron (II) ions, as well as formation of molecular oxygen. For the uncoated AISI 446 sample, localized corrosion is detected in sodium sulphate solution simultaneously with oxygen formation at anodic potentials of 1.0 V vs. Ag/AgCl, whereas significant pitting corrosion is observed even at 0.2 V vs. Ag/AgCl in potassium chloride solution. The Ti-coated AISI 446 sample reveals enhanced corrosion resistance in both test solutions, without any evidence of iron (II) ions generation at anodic potentials of 1.2 V vs. Ag/AgCl, where only oxygen formation is observed. 展开更多
关键词 Ferritic stainless steel CORROSION Ti coating Scanning electrochemical microscopy(SECM) Magnetron sputtering Proton exchange membrane water electrolysis(PEMWE)
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