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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 NiCo2O4 catalysts with different shape by controlling the reaction solvent and studied their morphology‐dependent ORR/OER activities by various characterizations and electrochemical measurements. The NiCo2O4 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.
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Li et al. (2019) studied this question.
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