Low Overpotential and Stable Electrocatalytic Oxygen Evolution Reaction Utilizing Doped Perovskite Oxide, La0.7Sr0.3MnO3, Modified by Cobalt Phosphate
Published Web Location
https://doi.org/10.1021/acsaem.9b02167
Abstract
A low overpotential of 220 mV at 10 mA cm-2 comparable to the benchmark RuO2 catalyst with a Tafel slope of 62 mV per decade having a turnover frequency of 3.17 s-1 is attained for strontium-doped lanthanum manganite (La0.7Sr0.3MnO3) coupled with cobalt phosphate (Co-Pi) for the oxygen evolution reaction (OER). Impedence spectroscopic analysis of La0.7Sr0.3MnO3/Co-Pi suggests a favorable charge-transfer resistance results in efficient charge carrier extraction. A Faradaic yield close to unity (98%) for the OER suggests that the oxygen evolved during the reaction is solely from the water oxidation.
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