电催化剂
催化作用
电化学
溶解
化学
甲醇
化学工程
合金
阳极
电解质
无机化学
材料科学
电极
物理化学
有机化学
工程类
作者
Shouping Chen,Mufan Li,Mengyu Gao,Jianbo Jin,M. A. Van Spronsen,Miquel Salmerón,Peidong Yang
出处
期刊:Nano Letters
[American Chemical Society]
日期:2020-02-12
卷期号:20 (3): 1974-1979
被引量:167
标识
DOI:10.1021/acs.nanolett.9b05251
摘要
Pt-based alloy catalysts are promising candidates for fuel-cell applications, especially for cathodic oxygen reduction reaction (ORR) and anodic methanol oxidation reaction (MOR). The rational design of composition and morphology is crucial to promoting catalytic performances. Here, we report the synthesis of Pt-Co nanoframes via chemical etching of Co from solid rhombic dodecahedra. The obtained Pt-Co nanoframes exhibit excellent ORR mass activity in acidic electrolyte, which is as high as 0.40 A mgPt-1 initially and 0.34 A mgPt-1 after 10 000 potential cycles at 0.95 VRHE. Furthermore, their MOR mass activity in alkaline media is up to 4.28 A mgPt-1 and is 4-fold higher than that of commercial Pt/C catalyst. Experimental studies indicate that the weakened binding of intermediate carbonaceous poison contributes to the enhanced MOR behavior. More impressively, the Pt-Co nanoframes also demonstrate remarkable stability under long-term testing, which could be attributed to the negligible electrochemical Co dissolution.
科研通智能强力驱动
Strongly Powered by AbleSci AI