Achieving Remarkable Activity and Durability toward Oxygen Reduction Reaction Based on Ultrathin Rh-Doped Pt Nanowires

被引：294

作者：

Huang, Hongwen ^{[1
]}

Li, Kan ^{[1
]}

Chen, Zhao ^{[1
]}

Luo, Laihao ^{[1
]}

Gu, Yuqian ^{[1
]}

Zhang, Dongyan ^{[1
]}

Ma, Chao ^{[1
]}

Si, Rui ^{[2
]}

Yang, Jinlong ^{[1
]}

Peng, Zhenmeng ^{[3
]}

Zeng, Jie ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Chem Phys, Hefei Natl Lab Phys Sci Microscale, Key Lab Strongly Coupled Quantum Matter Phys,Chin, Hefei 230026, Anhui, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

[3] Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2017年 / 139卷 / 24期

基金：

中国博士后科学基金;

关键词：

ELECTROCATALYTIC PROPERTIES; PLATINUM NANOPARTICLES; STRAIN CONTROL; FUEL-CELLS; PT-SKIN; CATALYSTS; SURFACES; NANOCRYSTALS; NANOFRAMES; STABILITY;

D O I：

10.1021/jacs.7b01036

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The research of active and sustainable electrocatalysts toward oxygen reduction reaction (ORR) is of great importance for industrial application of fuel cells. Here, we report a remarkable ORR catalyst with both excellent mass activity and durability based on sub 2 nm thick Rh-doped Pt nanowires, which combine the merits of high utilization efficiency of Pt atoms, anisotropic one-dimensional nanostructure, and doping of Rh atoms. Compared with commercial Pt/C catalyst, the Rh-doped Pt nanowires/C catalyst shows a 7.8 and 5.4-fold enhancement in mass activity and specific activity, respectively. The combination of extended X-ray absorption fine structure analysis and density functional theory calculations reveals that the compressive strain and ligand effect in Rh-doped Pt nanowires optimize the adsorption energy of hydroxyl and in turn enhance the specific activity. Moreover, even after 10000 cycles of accelerated durability test in O-2 condition, the Rh-doped. Pt nanowires/C catalyst exhibits a drop of 9.2% in mass activity, against a big decrease of 72.3% for commercial Pt/C. The improved durability can be rationalized by the increased vacancy formation energy of Pt atoms for Rh-doped Pt nanowires.

引用

页码：8152 / 8159

页数：8

共 55 条

[21] Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set [J].