New ternary mixed oxides of Fe, Ni and Mo for enhanced oxygen evolution

Kumar, Manoj and Awasthi, R and Pramanick, A K and Singh, R N (2011) New ternary mixed oxides of Fe, Ni and Mo for enhanced oxygen evolution. International Journal of Hydrogen Energy, 36 (20). pp. 12698-12705.

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Ternary mixed oxides of Fe, Ni and Mo with molecular formulas FexNi1−xMoO4 (x = 0.25, 0.50 and 0.75) have been prepared by a co-precipitation method and investigated for their structural and electrocatalytic properties by XRD, AFM, electrochemical impedance spectroscopy and anodic Tafel polarization. Results indicate that the apparent oxygen evolution activity of the base (NiMoO4) electrode significantly increases with introduction of Fe from 0.25 to 0.75 mol. The Tafel slope for the oxygen evolution reaction at low overpotentials is found to be only ∼35 mV on Fe-substituted oxides, while it was ∼75 mV on the base oxide. The reaction follows the first order kinetics with respect to OH− concentration, regardless of Fe content in the oxide.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Ternary mixed oxides; Oxygen evolution reaction; Electrocatalytic properties; Specific activity
Divisions:Metal Extraction and Forming
ID Code:4232
Deposited By:Dr. A K Sahu
Deposited On:05 Nov 2011 12:59
Last Modified:21 Nov 2011 12:35
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