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We present a study based on the layered oxide system NaxCoO2 as an oxygen evolution reaction (OER) catalyst, where the formal oxidation state of Co can be continuously increased, above 3+, through Na-ion deintercalation. Accompanying this increase of formal Co oxidation state, the overpotential for the catalytic oxygen evolution reaction (OER) at 10mA/cm2 decreases from 470mV to 415mV, while all the...
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