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Rechargeable zinc-air batteries (RZABs) are one of the most promising next-generation energy-storage technologies for stationary applications (home and industry), wearable and portable electronics, and transportation (including electric vehicles) due to their high energy density, environmental friendliness, safety, and low cost. However, RZABs still face serious challenges (such as sluggish oxygen reactions, poor durability, inferior reversibility of the zinc anode, and low cell energy efficiency) that conspire against their widespread commercialization. The reactions that occur at the three key components of the RZAB (air cathode, zinc anode, and electrolyte) cooperatively conspire against its performance. Thus, this review focuses on the bifunctional electrocatalytic events at the cathode (i. e., oxygen reduction reaction (ORR) and oxygen evolution reaction (OER)). That is in addition to the recent developments aimed at mitigating the performance-limiting events at the anode and the electrolytes. This review directs the attention of researchers and users to the critical areas for the development of the next-generation RZABs.

Porous spinel-type transition metal oxides (PS-TMOs) nanocatalysts comprising two kinds of metals (denoted as AxB3-xO4, where A, B = Co, Ni, Zn, Mn, Fe, V, Sm, Li, and Zn) have...

What is the most significant result of this study?This article provides an in-depth review of the recent efforts made by various researchers across the globe in the design, synthesis, and interrogation of bifunctional electrocatalysis for oxygen reduction and reaction (ORR) and oxygen evolution reaction (OER) as well as their related utilization in the rational design of efficient RZABs Would you describe to the layperson the most significant result of this study?Rechargeable zinc-air battery (RZAB) is regarded as one of the most viable electricity storage technologies that promise to meet the requirements for environmental-friendliness, sustainability, and affordability. In this article, the authors undertook a comprehensive review of the current research efforts aimed at developing RZAB. The findings reported in this work are expected to direct and/or redirect researchers' attention to critical areas of need for a speedy realization of commercially available RZAB.