Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8942816 | International Journal of Hydrogen Energy | 2018 | 13 Pages |
Abstract
Binary mixed oxides of molybdenum and a metal of the first-row transition metals with compositional formulae, MMoO4 (where MÂ =Â Cr, Fe, Mn, Co, Ni, Cu or Zn), were prepared by a microwave-assisted co-precipitation method and their electrocatalytic activities have been investigated for oxygen evolution reaction (OER) in 1Â M KOH. Materials were characterized for structural and electrocatalytic surface properties using FT-IR, XRD, TEM, BET, XPS, cyclic voltammetry (CV) and anodic Tafel polarization techniques. The crystallite size of oxides ranged between â¼17 and â¼41Â nm. For electrochemical studies, oxides obtained in powders form were produced in the thin-film form on the pretreated glassy carbon (GC) support. It has been observed that among electrocatalysts investigated, the CoMoO4/GC electrode was the greatest OER active while that the MnMoO4/GC electrode was the least active. The OER produced low Tafel slopes, â¼36, â¼43 and â¼46Â mV respectively on FeMoO4, CoMoO4 and CuMoO4 while it showed the higher Tafel slopes on CrMoO4(â¼57Â mV), NiMoO4(â¼71Â mV) and MnMoO4 (â¼89Â mV).
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
V.K.V.P. Srirapu, Ajay Kumar, Nirmala Kumari, Pankaj Srivastava, Ravindra Nath Singh,