Facile Synthesis Approach of Bifunctional Co-Ni-Fe Oxyhydroxide and Spinel Oxide Composite Electrocatalysts from Hydroxide and Layered Double Hydroxide Composite Precursors

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2023 Apr 7

PMID 37025668

Authors

Sho Kitano

Yuki Sato

Reiko Tagusari

Ruijie Zhu

Damian Kowalski

Yoshitaka Aoki

Hiroki Habazaki

Affiliations

Soon will be listed here.

Abstract

Zinc-air batteries (ZABs) are promising candidates for the next-generation energy storage systems, however, their further development is severely hindered by kinetically sluggish oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Facile synthesis approaches of highly active bifunctional electrocatalysts for OER and ORR are required for their practical applications. Herein, we develop a facile synthesis procedure for composite electrocatalysts composed of OER-active metal oxyhydroxide and ORR-active spinel oxide containing Co, Ni and Fe from composite precursors consisting of metal hydroxide and layered double hydroxide (LDH). Both hydroxide and LDH are simultaneously produced by a precipitation method with a controlled molar ratio of Co, Ni and Fe in the reaction solution, and calcination of the precursor at a moderate temperature provides composite catalysts of metal oxyhydroxides and spinel oxides. The composite catalyst shows superb bifunctional performances with a small potential difference of 0.64 V between a potential of 1.51 V RHE at 10 mA cm for OER and a half-wave potential of 0.87 V RHE for ORR. The rechargeable ZAB assembled with the composite catalyst as an air-electrode exhibits a power density of 195 mA cm and excellent durability of 430 hours (1270 cycles) of a charge-discharge cycle test.

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