Abstract
The novel solution route based on metal-organic decomposition (MOD) process is successfully developed for a facile preparation of CoFe2O4. The electrocatalytic activity of CoFe2O4 for the oxygen evolution reaction (OER) of electrochemical water splitting is investigated as a function of calcination temperature in the range between 300 and 450 °C. It is significantly found that a drastic cation redistribution in octahedral and tetrahedral sites within the spinel structure of 450 °C-calcinated CoFe2O4 p-type semiconductor leads to the dramatic enhancement in hole density and concomitant OER activity. The CoFe2O4 integrated on carbon fiber paper (CFP) exhibits high electrocatalytic performance, including an overpotential (η10) of 359 mV at10 mA cm−2 and a Tafel slope of 53.8 mV dec−1 in 1 M KOH aqueous solution. Based on this work, a design principle of the MOD solution process developed can be applied to preparation of a greater variety of compounds. Also, elucidation of structure-OER activity relationships in spinel-type CoFe2O4 electrocatalysts will be able to advance further.
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