Effect of V substitution at B-site on the physicochemical and electrocatalytic properties of spinel-type NiFe2O4 towards O2 evolution in alkaline solutions

被引：45

作者：

Anindita ^{[1
]}

Singh, A. ^{[1
]}

Singh, R. N. ^{[1
]}

机构：

[1] Banaras Hindu Univ, Fac Sci, Dept Chem, Varanasi 221005, Uttar Pradesh, India

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 08期

关键词：

O-2; evolution; Electrocatalysis; Nickel ferrites; Water electrolysis; Impedance spectroscopy; OXYGEN EVOLUTION; SURFACE-PROPERTIES; PARTIAL REPLACEMENT; LOW-TEMPERATURE; NICO2O4; SPINEL; THIN CO3O4; NI-CO; ELECTRODES; FILMS; METAL;

D O I：

10.1016/j.ijhydene.2010.02.003

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：

Spinel-type ternary transition metal oxides of nickel, iron and vanadium with composition NiFe2-xVxO4 (0 <= x <= 1) have been synthesized by a hydroxide precipitation method and investigated for their physicochemical and electrochemical catalytic properties towards the oxygen evolution reaction (OER) in alkaline solutions at 25 degrees C. The OER study indicates that substitution of V from 0.25 to 1.0 mol for Fe in the spinel matrix increases the electrocatalytic activity of the oxide greatly; the activity being the greatest with x = 0.5 mol. At low overpotentials, the Tafel slope and the order for the OER with respect to OH- concentration were found to be similar to 40 mV and similar to 2, respectively. (C) 2010 Published by Elsevier Ltd on behalf of Professor T. Nejat Veziroglu.

引用

页码：3243 / 3248

页数：6

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