Oxygen electrocatalytic activities in transition-metal atoms and/or heteroatom-doped carbon nanostructures are strongly dependent on their conductivity and electron configurations. Herein, this study reports Mn₃O₄/self-growth carbon nanotubes induced by a transition metal cobalt hybrid as the efficient bifunctional oxygen electrocatalyst for rechargeable zinc–air batteries. The positive effect posed by the hierarchical structure and heteroatom doping provides an extra electronic state, eventually enhancing the oxygen adsorption and charge transfer during oxygen electrochemical reactions. The assembled rechargeable zinc–air battery achieves a high power density of 128 mW cm⁻² and an excellent cycle stability of over 160 h at 5 mA cm⁻². This study provides a feasible approach for designing efficient bifunctional oxygen electrocatalysts for broad applications in the field of energy conversion technology.

中文翻译：

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过渡金属钴诱导的Mn3O4 /自生长N掺杂碳纳米管促进氧电催化反应

过渡金属原子和/或杂原子掺杂的碳纳米结构中的氧电催化活性强烈取决于其电导率和电子构型。本文中，本研究报告了由过渡金属钴杂化物诱导的Mn ₃ O ₄ /自生长碳纳米管，作为可充电锌空气电池的高效双功能氧电催化剂。分层结构和杂原子掺杂带来的正效应提供了额外的电子状态，最终增强了氧电化学反应期间的氧吸附和电荷转移。组装好的可充电锌空气电池实现了128 mW cm ^-2的高功率密度，并在5 mA cm ^-2时具有超过160 h的出色循环稳定性。这项研究为设计高效的双功能氧电催化剂提供了可行的方法，以在能量转换技术领域中广泛应用。