Dissolution and redeposition on Pt nanoparticles under electrochemical conditions

被引：3
|
作者：
Zhdanov, Vladimir P. [1 ,2 ,3 ]
Kasemo, Bengt [1 ,2 ]
机构：
[1] Chalmers, Dept Appl Phys, S-41296 Gothenburg, Sweden
[2] Chalmers, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden
[3] Russian Acad Sci, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
来源：
CHEMICAL PHYSICS LETTERS | 2011年 / 509卷 / 4-6期
关键词：
QUARTZ-CRYSTAL MICROBALANCE; DYNAMIC MECHANISTIC MODEL; ELECTROLYTE FUEL-CELLS; PLATINUM DISSOLUTION; POLYMER ELECTROLYTE; DEGRADATION; REDUCTION; CATALYST; KINETICS; PT(111);
D O I：
10.1016/j.cplett.2011.04.075
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：
We present a Schottky-type model describing Pt2+ dissolution and redeposition on Pt nanoparticles in polymer electrolyte fuel cells. The charge transfer is considered to occur near the surface of nanoparticles so that the potential barrier for the reaction is formed by the double-layer potential and the image interaction. With increasing electrode potential, the transfer coefficient for dissolution is found to decrease from 0.6-0.7 down to 0.3-0.4. Its dependence on the effective dielectric constant of the double layer is appreciable while the dependence on the particle size is weak. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：134 / 137
页数：4
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