Abstract
Summary Traditional oxygen electrocatalysts do not dissociatively chemisorb oxygen, resulting in electrochemical irreversibility. However, under certain conditions perovskite oxide catalysts enable the paramagnetic oxygen molecule to be chemisorbed “side-on”, which can then result in dissociative chemisorption. One such compound La0.5Sr0.5CoO3 exhibits a steady and reproducible open-circuit potential vs. RHE of 1.22 V in 45% KOH even at 25°C, and variation with oxygen partial pressure follows the Nernst equation for a four-electron process. In addition the current density at constant polarization is directly proportional to the square root of oxygen partial pressure, suggesting that the Joint Pseudosplitting/Dissociative Adsorption mechanism is operative. The performance of such electrodes surpasses that of platinum black electrodes at temperatures above 170°C.
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