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Shape‐Controlled Synthesis of NiCo 2 O 4 ‐rGO as Bifunctional Electrocatalyst for Zn‐Air Battery
Author(s) -
Li Yao,
Cheng Gao,
Zhou Zihao,
Liao Xiuhong,
Han Shengbo,
Ye Fei,
Sun Ming,
Yu Lin
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201901109
Subject(s) - overpotential , electrocatalyst , bifunctional , oxygen evolution , catalysis , battery (electricity) , electrochemistry , methanol , chemical engineering , materials science , solvent , chemistry , inorganic chemistry , electrode , organic chemistry , power (physics) , physics , quantum mechanics , engineering
The engineering of morphology and surface structure of electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is an effective strategy to improve their performance. Herein, we synthesized NiCo 2 O 4 catalysts with different shape by controlling the reaction solvent and studied their morphology‐dependent ORR/OER activities by various characterizations and electrochemical measurements. The NiCo 2 O 4 prepared using methanol as solvent displays three‐dimensional (3D) hierarchical structure composed of interconnected nanosheets, and exhibits the best ORR/OER performance (a half‐wave potential of 0.78 V for ORR and an overpotential of 381 mV for OER). When used as catalyst for a rechargeable Zn‐air battery, it possesses a peak power density of 125.3 mW cm −2 with relatively superior durability.