Low Overpotential and Stable Electrocatalytic Oxygen Evolution Reaction Utilizing Doped Perovskite Oxide, La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub>, Modified by Cobalt Phosphate
Sourav Bhowmick, Ankit Dhankhar, Tushar Kanta Sahu, Rohan Jena, Devipriya Gogoi, Nageswara Rao Peela, Shane Ardo, Mohammad Qureshi
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.
Topics & Concepts
OverpotentialTafel equationOxygen evolutionCobaltInorganic chemistryManganiteOxideMaterials sciencePerovskite (structure)Cobalt oxideCatalysisOxygenLanthanum manganiteLanthanumChemistryPhysical chemistryElectrochemistryMetallurgyCrystallographyElectrodeFerromagnetismElectrolyteBiochemistryOrganic chemistryQuantum mechanicsPhysicsElectrocatalysts for Energy ConversionElectrochemical Analysis and ApplicationsAdvanced battery technologies research