Abstract
Rechargeable zinc-air battery (ReZAB) has emerged as a viable alternative to Li-ion battery. It is safe, environmentally friendly, low-cost, and possesses high theoretical specific energy density (1086 Wh/kg) which is about five times than the Li-ion battery. Non-rechargeable zinc-air battery has been around for almost two centuries, but its rechargeable counterpart (ReZAB) is almost non-existent. One of the key frustrations for the development of the ReZAB is the poor electrochemical kinetics of the two oxygen reactions, i.e., oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). Of the two oxygen reactions, OER is the limiting reaction for ReZAB because of its extreme high overpotential [1,2]. High-entropy spinel oxides (HESOx) are one of the emerging high-entropy materials as electrocatalysts for a plethora of electrocatalytic applications. HESOx exhibit excellent physical and chemical properties that allow them to be used in electrocatalysis, including as bifunctional catalysts for OER/ORR.This presentation will describe our successful synthesis of defective single nanocrystalline HESOx materials and their application as bifunctional electrocatalysts for OER/ORR and in ReZAB. Importantly, we will show that these defective HESOx electrocatalysts meet the minimum standard for the development of technologically relevant ReZABs that can compete with Li-ion battery pack [3,4]. References AB Haruna and KI Ozoemena, Manganese-based bifunctional electrocatalysts for zinc-air batteries, Curr. Opin. Electrochem. 2020, 21, 219-224AK Ipadeola, AB Haruna, L Gaolatlhe, AK Lebechi, J Meng, QQ Pang, K Eid, AM Abdullah, and KI Ozoemena, Efforts at Enhancing Bifunctional Electrocatalysis and Related Events for Rechargeable Zinc-Air Batteries; ChemElectroChem 2021, 8, 3998-4018 JF Parker, JS Ko, DR Rolison, JW Long, Translating materials-level performance into device-relevant metrics for zinc-based batteries, Joule 2018, 2, 2519–2527. BJ Hopkins, CN Chervin, JF Parker, JW Long, DR Rolison, An areal-energy standard to validate air-breathing electrodes for rechargeable zinc–air batteries, Adv. Energy Mater. 2020, 10, Article 2001287
Published Version
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