检索结果-南通市图书馆

Electrochemical probing into the active sites of graphitic-layer encapsulated iron oxygen reduction reaction electrocatalysts

引用

Science Bulletin 2018年第1期63卷 24-30页

作者： Lijie Zhong Jens Oluf Jensen lars.nilausen cleemann Chao Pan Qingfeng Li Department of Energy Conversion and Storage Technical University of Denmark

The graphitic-layer encapsulated iron-containing nanoparticles(G@Fe) have been proposed as a potential type of active and stable non-precious metal electrocatalysts(NPMCs) for the oxygen reduction reaction(ORR). However, the contribution of the encapsulated components to the ORR activity is still unclear compared with the well-recognized surface coordinated FeN_x/C structure. Using the strong complexing effect of the iron component with anions, cyanide(CN^-) in alkaline and thiocyanate(SCN^-) in acidic media, the metal containing active sites are electrochemically probed. Three representative catalysts are chosen for a comparison including the as-prepared encapsulated G@Fe, commercial Fe/N/C catalyst with iron–nitrogen coordinated surface functionalities and molecular iron phthalocyanine(Fe Pc) containing well-defined structures and compositions. It was found that all samples showed significant shifts of half-wave potentials indicating that surface Fe coordinated sites in all cases. The G@Fe catalyst showed the weakest poisoning effect(the lowest shifts of half-wave potential) compared to the Fe/N/C and Fe Pc catalysts in both electrolytes. These results could be explained that the encapsulated iron components influence the FeN_x/C and/or N_xC surface functionality.

关键词： Encapsulated Fe catalysts Oxygen reduction reaction Ion poisoning Active sites NPMCs

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Low- and Non-Pt Catalysts for Proton Exchange Membrane Fuel Cells

Low- and Non-Pt Catalysts for Proton Exchange Membrane Fuel ...

引用

中国化学会2019能源材料和缺陷化学研讨会

作者： Qingfeng Li Yang Hu Benedikt Axel Brandes lars.nilausen cleemann Jens Oluf Jensen Section of Electrochemistry Department of Energy Storage and Conversion Technical University of Denmark

＜正＞Electrocatalysts for low temperature fuel cells are based on noble metals, the resource issue of which will be briefly reviewed. Approaches and efforts towards low platinum load catalysts by means of alloying and nano architecturing. Significant progress has been achieved by development of Pt alloys with late transition metals such as Ni and Co, which exhibit much-enhanced performance.[1,2] It has been predicted that Pt alloys with rare earth metals exhibit remarkable activity and high stability towards the oxygen reduction reaction.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Tailoring the particle sizes of Pt5Ce alloy nanoparticles for the oxygen reduction reaction

Advanced Sensor and Energy Materials

引用

Advanced Sensor and Energy Materials 2022年第3期1卷 31-38页

作者： Quan Zhou Jens Oluf Jensen lars.nilausen cleemann Qing-Feng Li Yang Hu Department of Energy Conversion and Storage Technical University of DenmarkFysikvejBuilding 3102800 Kgs.LyngbyDenmark Blue World Technologies ApS Egeskovvej 6C3490 KvistgaardDenmark

Pt-rare earth(RE)alloys are among the most efficient catalytic materials for the oxygen reduction reaction in acidic media,which,however,are very difficult to *** theoretical and experimental studies indicated that the optimum particle structure is the Pt5RE intermetallic phases with the optimum sizes of around 6–9 *** this work,using a synthesis method recently developed by our group,we attempt to synthesize such alloy ***,we explored the synthesis conditions to obtain pure-phase ***,we attempted to control the size of the alloy particles,which turned out to be the main challenge of this *** that end,we have investigated the growth pattern of the particles during the synthesis process and used two synthesis parameters,the metal loading and the surface area of the carbon support,to tailor the particle *** sizes and oxygen reduction reaction(ORR)performance of the best Pt5Ce/C sample obtained so far are discussed.

关键词： Platinum Rare earth metal Particle size Oxygen reduction Fuel cell

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：