In-Situ Monitoring of Platinum Dissolution under Potential Cycling by a Channel Flow Double Electrode

被引：31
|
作者：
Wang, Zhongqi [1 ]
Tada, Eiji [1 ]
Nishikata, Atsushi [1 ]
机构：
[1] Tokyo Inst Technol, Grad Sch Sci & Technol, Meguro Ku, Tokyo 152, Japan
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2014年 / 161卷 / 04期
关键词：
SULFURIC-ACID-SOLUTION; MEMBRANE FUEL-CELLS; DISK ELECTRODE; AQUEOUS-MEDIA; OXIDE-GROWTH; DEPOSITION; MECHANISM; SURFACES; ELECTROCATALYSTS; NANOPARTICLES;
D O I：
10.1149/2.012404jes
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Submonolayer dissolution of platinum (Pt) nanoparticles under potential cycling is specified by a channel flow double electrode system. Dissolution of Pt+ starts at 0.6 V (vs. standard hydrogen electrode) in an anodic scan. The amount of dissolved Pt2+ below 1.0 V was calculated using collector current (I-C) and was confirmed by ex-situ inductively coupled plasma mass spectrometry. The amount of Pt2+ and pt(4+) dissolved in different potential regions during potential cycling was quantified by I-C for the first time. A mechanism of Pt dissolution under potential cycling in 0.5 M H2SO4 was proposed, and an in-situ system capable of quantitatively monitoring submonolayer dissolution of Pt2+ and Pt4+ was established. (C) 2014 The Electrochemical Society. All rights reserved.
引用
收藏
页码：F380 / F385
页数：6
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