New ternary Fe, Co, and Mo mixed oxide electrocatalysts for oxygen evolution

被引：35
|
作者：
Kumar, M. [1 ]
Awasthi, R. [1 ]
Sinha, A. S. K. [2 ]
Singh, R. N. [1 ]
机构：
[1] Banaras Hindu Univ, Fac Sci, Dept Chem, Ctr Adv Study, Varanasi 221005, UP, India
[2] Banaras Hindu Univ, Dept Chem Engn, Inst Technol, Varanasi 221005, UP, India
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2011年 / 36卷 / 15期
关键词：
Mixed oxides; Oxygen evolution; Electrocatalysts; Ternary oxides; Molybdates; Electrochemical impedance spectroscopy; PEROVSKITE-TYPE OXIDES; O-2; EVOLUTION; ELECTROCHEMICAL CHARACTERIZATION; SURFACE-PROPERTIES; SPRAY-PYROLYSIS; LOW-TEMPERATURE; NI ELECTRODES; SPINEL OXIDES; FILMS; COBALT;
D O I：
10.1016/j.ijhydene.2011.04.071
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：
Ternary mixed oxides of Fe, Co, and Mo with composition FexCo1-xMoO4 (x = 0.25, 0.50 & 0.75) have been prepared by a co-precipitation method and investigated as electrocatalysts for the oxygen evolution reaction (OER) in alkaline solutions. The study indicates that partial replacement of Co by Fe in the CoMoO4 matrix increases the specific surface area as well as the apparent electrocatalytic activity of the oxide; the magnitude of increase being the greatest with x = 0.25. The order for the OER with respect to OH- concentration has been observed to be similar to 2 on Fe0.75Co0.25MoO4 and similar to 1 on Fe0.25Co0.75MoO4 and Fe0.5Co0.5MoO4. The Tafel slopes at low overpotentials were close to 40 mV with each oxide catalyst. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：8831 / 8838
页数：8
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