A bioinspired water oxidation catalyst that is ∼1/10<sup>th</sup> as active as the photosystem II oxygen evolving center at pH 7: a study of activity and stability factors
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Boskovic, Danijel
Terrett, Richard
Longhurst, Matthew
Basheer, Sabeel
Ariafard, Alireza
Wagner, Pawel
Pace, Ronald J.
Stranger, Rob
Swiegers, Gerhard F.
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The activity and stability of a heterogeneous water oxidation catalyst inspired by the Photosystem II - Oxygen Evolving Center (PSII-OEC) is reported. Ca-doped birnessite MnOx supported on a liquid crystalline reduced graphene oxide (LCrGO) substrate exhibited unprecedented performance for an abiological catalyst at pH 7, including an exceedingly low onset overpotential of 0.52 V (vs. 0.48 V reported for the PSII-OEC, 0.75 V for Pt, and 0.72 V for birnesite MnOx) and remarkably high activity per unit area at 0.56 V overpotential (∼10% that of a hypothetical, closely-packed monolayer of OEC sites at their optimum density of 1014 sites per cm2).
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Dalton Transactions
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