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题名: Surface evolution of a Pt-Pd-Au electrocatalyst for stable oxygen reduction
作者: Li, Jian1, 2;  Yin, Hui-Ming1, 2;  Li, Xi-Bo3;  Okunishi, Eiji4;  Shen, Yong-Li1, 2;  He, Jia1, 2;  Tang, Zhen-Kun3;  Wang, Wen-Xin1, 2;  Yucelen, Emrah5;  Li, Chao1, 2;  Gong, Yue6;  Gu, Lin6;  Miao, Shu7;  Liu, Li-Min3;  Luo, Jun1, 2;  Ding, Yi1, 2
刊名: NATURE ENERGY
发表日期: 2017-08-01
DOI: 10.1038/nenergy.2017.111
卷: 2, 期:8
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Energy & Fuels ;  Materials Science, Multidisciplinary
研究领域[WOS]: Energy & Fuels ;  Materials Science
英文摘要: Core- shell nanocatalysts have demonstrated potential as highly active low-Pt fuel cell cathodes for the oxygen reduction reaction (ORR); however, challenges remain in optimizing their surface and interfacial structures, which often exhibit undesirable structural degradation and poor durability. Here, we construct an unsupported nanoporous catalyst with a Pt- Pd shell of sub-nanometre thickness on Au, which demonstrates an initial ORR activity of 1.140Amg(Pt)(-1) at 0.9V. The activity increases to 1.471Amg(Pt)(-1) after 30,000 potential cycles and is stable over a further 70,000 cycles. Using aberration-corrected scanning transmission electron microscopy and atomically resolved elemental mapping, the origin of the activity change is revealed to be an atomic-scale evolution of the shell from an initial Pt-Pd alloy into a bilayer structure with a Pt-rich trimetallic surface, and finally into a uniform and stable Pt-Pd-Au alloy. This Pt-Pd-Au alloy possesses a suitable configuration for ORR, giving a relatively low free energy change for the final water formation from adsorbed OH intermediate during the reaction.
关键词[WOS]: MONOLAYER ELECTROCATALYSTS ;  PLATINUM NANOPARTICLES ;  ENHANCED ACTIVITY ;  FUEL-CELLS ;  ALLOY ;  CATALYSTS ;  STRAIN ;  METAL ;  GOLD ;  SEGREGATION
语种: 英语
WOS记录号: WOS:000411264300018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/150112
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.Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Adv Funct Porous Mat, Tianjin 300384, Peoples R China
2.Tianjin Univ Technol, Sch Mat Sci & Engn, Ctr Electron Microscopy, Tianjin 300384, Peoples R China
3.Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China
4.JEOL Ltd, 1-2 Musashino,3 Chome Akishima, Tokyo 1968558, Japan
5.FEI Co BV, NanoPort Europe, POB 80066, NL-5600 KA Eindhoven, Netherlands
6.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
7.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Li, Jian,Yin, Hui-Ming,Li, Xi-Bo,et al. Surface evolution of a Pt-Pd-Au electrocatalyst for stable oxygen reduction[J]. NATURE ENERGY,2017,2(8).
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