首页|Novel medium entropy perovskite oxide Sr(FeCoNiMo)1/4O3-δ for zinc-air battery cathode
Novel medium entropy perovskite oxide Sr(FeCoNiMo)1/4O3-δ for zinc-air battery cathode
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It is widely recognized that the development of ZABs is impeded by the kinetic bottleneck of oxygen evo-lution reaction(OER)and oxygen reduction reaction(ORR).The application of conformational entropy strategy to oxides often involves introducing multiple elements with different properties,thereby provid-ing outstanding bifunctional catalytic activity for OER/ORR.Nevertheless,the possible underlying cat-alytic pathways and potential interactions between various components are still poorly understood.This paper presents an excellent medium-entropy perovskite oxide,Sr(FeCoNiMo)1/4O3-δ(lower overpo-tential of 301 mV at 10 mA cm-2).Zinc-air batteries employing it as a cathode catalyst demonstrate excellent round-trip efficiency(62％).By combining theoretical calculation with experiments,we aim to establish the link between the electronic structure of perovskite oxides with different elemental com-positions and their OER mechanism.Research reveals that the conformational entropy strategy can simultaneously shift the O 2p-band center and metal d-band center of perovskite oxide towards the vicin-ity of the Fermi energy level,thereby triggering a more favorable lattice oxygen-participated mechanism(LOM)during the OER process.The outcomes of this work provide crucial insights into the role of confor-mational entropy strategies in oxygen catalysis and offer potential avenues for constructing efficient and stable electrocatalysts.
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