Abstract
New spinel-type oxides with molecular formulae MMoO 4 (M = Fe, Co and Ni) have been prepared by a thermal decomposition method at 650 °C and investigated as electrocatalysts for the O 2 evolution reaction (OER) in KOH solutions. The results show that the new oxide electrocatalysts are highly active for the OER, but they have very low electrochemically active areas, the relative oxide roughness factor being <2. The Tafel slope values for the OER on each oxide in 1 M KOH are found to be ∼40 and ∼60 mV at low and higher potentials, respectively. The reaction order with respect to OH − concentration has been observed to be 1.18, 1.51 and 1.94 on CoMoO 4, FeMoO 4 and NiMoO 4 electrodes, respectively. Both in 1 M KOH and practical cell solution (30 wt% KOH) at 25 °C, the performance of the FeMoO 4 electrode is observed to be better than the other two electrodes.
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