Electrochemical noise analysis of the effects of a magnetic field on cathodic hydrogen evolution

被引：39

作者：

Diao, Z. ^{[1
,2
]}

Dunne, P. A. ^{[1
,2
]}

Zangari, G. ^{[1
,2
,3
]}

Coey, J. M. D. ^{[1
,2
]}

机构：

[1] Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland

[2] Trinity Coll Dublin, CRANN, Dublin 2, Ireland

[3] Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2009年 / 11卷 / 04期

基金：

爱尔兰科学基金会;

关键词：

Magnetoelectrochemistry; Lorentz force; Hydrogen evolution reaction; Noise spectra; WATER ELECTROLYSIS; SPECTRAL-ANALYSIS;

D O I：

10.1016/j.elecom.2009.01.020

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The effect of a static magnetic field on the evolution of hydrogen gas from a small platinum electrode in an aqueous electrolyte has been studied by recording the noise spectrum of overpotential voltage fluctuations at a constant current density of -50 mA mm(-2). A 1/f(2) variation of the power spectrum characteristic of droplet coalescence is found for frequencies >10 Hz. The overpotential for hydrogen evolution decreases with applied field. When the production of gas bubbles is quasiperiodic, there is a threshold field of 0.5 T beyond which the size of the bubbles released is approximately doubled. This is explained by enhanced coalescence of small bubbles swept across the electrode surface by forced convection due to the Lorentz force. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：740 / 743

页数：4

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