Comparison of the Oxygen Reduction Reaction between NaOH and KOH Solutions on a Pt Electrode: The Electrolyte-Dependent Effect

被引：156

作者：

Jin, Wei ^{[1
,2
]}

Du, Hao ^{[1
]}

Zheng, Shili ^{[1
]}

Xu, Hongbin ^{[1
]}

Zhang, Yi ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2010年 / 114卷 / 19期

基金：

中国国家自然科学基金;

关键词：

REVERSIBLE POTENTIALS; ACTIVATION-ENERGIES; SUPEROXIDE ANION; SOLUBILITY; PLATINUM; SURFACE; WATER; ELECTROREDUCTION; ELECTROCATALYSIS; KINETICS;

D O I：

10.1021/jp102367u

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：

The oxygen reduction reaction (ORR) on a polycrystalline Pt surface was studied using cyclic voltammetry techniques, and the influence of reaction media on the ORR is examined by comparing the ORR in NaOH and KOH solutions with concentration ranging from 0.5 to 14 M at 298 K. The results show that, in NaOH and KOH solutions, the ORR, a quasi-reversible diffusion-controlled reaction, is largely dependent on the electrolyte conditions, and KOH solutions are superior to NaOH solutions for the ORR process in both thermodynamic and kinetic consideration. As the alkaline concentration increases, the ORR performance frustrates, and the protonation of superoxide is suppressed; thus, the ORR shifts from a 2e reduction pathway to a le reduction pathway in both solutions.

引用

页码：6542 / 6548

页数：7

共 54 条

[31] THEORY AND APPLICATION OF CYCLIC VOLTAMMETRY FOR MEASUREMENT OF ELECTRODE REACTION KINETICS [J].