Enhanced methanol electro-oxidation and oxygen reduction reaction performance of ultrafine nanoporous platinum-copper alloy: Experiment and density functional theory calculation

被引：58

作者：

Sun, Junzhe ^{[1
]}

Shi, Jun ^{[2
]}

Xu, Junling ^{[1
]}

Chen, Xiaoting ^{[1
]}

Zhang, Zhonghua ^{[1
]}

Peng, Zhangquan ^{[2
]}

机构：

[1] Shandong Univ, Sch Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Peoples R China

[2] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Elect Chem, Changchun 130022, Jilin, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2015年 / 279卷

基金：

中国国家自然科学基金;

关键词：

Mechanical alloying; Dealloying; Nanoporous alloy; Methanol; Oxygen reduction reaction; HYDROGEN-PEROXIDE; MONOLAYER ELECTROCATALYSTS; CATALYTIC-ACTIVITY; GOLD CATALYSTS; FUEL-CELLS; OXIDATION; CATHODE; METAL; FE; NI;

D O I：

10.1016/j.jpowsour.2015.01.025

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Novel ultrafine nanoporous Pt-Cu alloy with a Pt:Cu stoichiometric ratio of 3:1 (np-Pt3Cu) has been prepared by mechanical alloying and subsequent two-step chemical dealloying. The obtained np-Pt3Cu has uniform and bicontinuous ligament(metal)-channel(void) structure with the ligament size of 3.3 +/- 0.7 nm. To explore its potential application in energy conversion reactions, the np-Pt3Cu alloy has been examined as electrocatalyst for the operating reactions in direct methanol fuel cells (DMFCs). Compared with the commercial JM Pt/C, a benchmark catalyst extensively used in fuel cell research, the np-Pt3Cu alloy demonstrates better performance in both the methanol electro-oxidation and oxygen reduction reactions in acidic medium. Theoretical calculations reveal that the electronic structure of Pt has been modified with the shift of Pt d-band center due to alloying with Cu, which can decrease CO poisoning and enhance the methanol oxidation and oxygen reduction reaction activities. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：334 / 344

页数：11

共 57 条

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