Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7721114 | International Journal of Hydrogen Energy | 2013 | 9 Pages |
Abstract
Pure and Fe-substituted manganese molybdates with nominal compositional formula FexMn1âxMoO4 (x = 0, 0.25, 0.50 and 0.75) have been prepared by a co-precipitation method at pH â 2 and characterized by FT-IR, XRD, XPS, TEM, electrochemical impedance and polarization techniques. The oxygen evolution reaction (OER) study reveals that Fe substitutions from 0.25 to 0.75 mol for Mn increase the apparent electrocatalytic activity of the base oxide showing maximum with 0.5 mol Fe. At E = 0.60 V vs. Hg/HgO in 1 M KOH at 298 K, the apparent activity of the base oxide increased â¼58 times. It is observed that on Fe addition, the Tafel slope decreases from â¼60 to â¼35 mV, however, the order of the OER with respect to OHâ concentration as observed â¼2 on the base oxide (i.e. MnMoO4) does not change.
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Authors
V.K.V.P. Srirapu, M. Kumar, R. Awasthi, R.N. Singh, A.S.K. Sinha,