Activation pathways taking place at molecular copper precatalysts for the oxygen evolution reaction

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Abstract

The activation processes of [CuII(bdmpza)2] in the water oxidation reaction were investigated using cyclic voltammetry and chronoamperometry. Two different paths wherein CuO is formed were distinguished. [CuII(bdmpza)2] can be oxidized at high potentials to form CuO, which was observed by a slight increase in catalytic current over time. When [CuII(bdmpza)2] is initially reduced at low potentials, a more active water oxidation catalyst is generated, yielding high catalytic currents from the moment a sufficient potential is applied. This work highlights the importance of catalyst pre-treatment and the choice of the experimental conditions in water oxidation catalysis using copper complexes.

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van der Ham, C. J. M., Işık, F., Verhoeven, T. W. G. M., Niemantsverdriet, J. W. (Hans), & Hetterscheid, D. G. H. (2017). Activation pathways taking place at molecular copper precatalysts for the oxygen evolution reaction. Catalysis Today, 290, 33–38. https://doi.org/10.1016/j.cattod.2016.12.042

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