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题名: Promoting Effect of Ni in PtNi Bimetallic Electrocatalysts for the Methanol Oxidation Reaction in Alkaline Media: Experimental and Density Functional Theory Studies
作者: Jiang, Qian1, 2;  Jiang, Luhua1;  Hou, Hongying1;  Qi, Jing1, 2;  Wang, Suli1;  Sun, Gongquan1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2010-11-25
DOI: 10.1021/jp1039755
卷: 114, 期:46, 页:19714-19722
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Carbon-supported bimetallic Pt(m)Ni(n) electrocatalysts with different Pt/Ni atomic ratios were synthesized through a modified polyol process. The as-prepared electrocatalysts were characterized by X-ray diffraction, transmission electron microscopy, voltammetry techniques, and single-cell tests. It was revealed that the Pt(m)Ni(n) bimetallic nanoparticles were uniformly distributed on carbon supports with average diameters of about 3 nm. Pt and Ni were partially alloyed, indicated by the decreased Pt lattice constants compared with that of pure Pt. The results of the electrochemical measurements showed that the Pt(m)Ni(n)/C catalysts, compared with the Pt/C, have superior specific activity toward the methanol electrooxidation reaction (MOR) in alkaline media as well as a higher power density in a direct methanol fuel cell test with the Pt(3)Ni(1)/C as the anode catalyst. Density functional theory studies further revealed that the electronic structure of Pt was modified by Ni due to the charge transfer from Ni to Pt atoms in Pt(m)Ni(n) clusters, leading to a weakened CO adsorption on Pt(m)Ni(n) binary clusters than on Pt itself. This provides an explanation for the enhanced MOR activity of the Pt(m)Ni(n)/C catalysts.
关键词[WOS]: EFFECTIVE CORE POTENTIALS ;  FUEL-CELL ;  CARBON-MONOXIDE ;  OXYGEN REDUCTION ;  MOLECULAR CALCULATIONS ;  PLATINUM-ELECTRODES ;  EXCHANGE MEMBRANE ;  AD-ATOMS ;  ELECTROOXIDATION ;  ADSORPTION
语种: 英语
WOS记录号: WOS:000284287900023
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142203
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Direct Alcohol Fuel Cell Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

Recommended Citation:
Jiang, Qian,Jiang, Luhua,Hou, Hongying,et al. Promoting Effect of Ni in PtNi Bimetallic Electrocatalysts for the Methanol Oxidation Reaction in Alkaline Media: Experimental and Density Functional Theory Studies[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2010,114(46):19714-19722.
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