The electrocatalytic activity of ZnxCo3−xO4 for the oxygen evolution reaction is correlated with the population of high-spin Co3+ and the Co3+/Co2+ ratio.
The design and synthesis of an efficient and robust water-oxidation catalyst with inexpensive materials remains an important challenge in the context of artificial photosynthesis. Herein, as imple but unique technique is reported to in situ generate at hin-film of a-Co(OH) 2 on the surface of zeolite-Y [hereafter referred to as Y-a-Co(OH) 2 ] that acts as an efficient and stable catalyst for electrochemical water oxidation in alkaline medium. Catalyst Y-a-Co(OH) 2 is so stable that it retains its catalytic activity even after 2000 cyclic voltammetric cycles of water oxidation. Expectedly,t he chemical compositiono fa-Co(OH) 2 on the surface of zeolite-Y remainss ame as that of parentY -a-Co(OH) 2 after 2000 electrocatalytic cycles. AT afel slope as low as 59 mV decade À1 in 0.1 m KOH (pH 13) suggestsf aster oxygen evolution kinetics (overpotential = 329 mV;t urnover frequency = 0.35 mol O 2 (mol Co)À1 s À1 at 1mAcm À2 )t han the existing aCo(OH) 2 -based electrocatalysts operating in alkaline medium.
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