Freestanding bifunctional electrodes with outstanding oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) properties are of great significance for zinc–air batteries, attributed to the avoided use of organic binder and strong adhesion with substrates. Herein, a strategy is developed to fabricate freestanding bifunctional electrodes from the predeposited nickel nanoparticles (Ni‐NCNT) on carbon fiber paper. The steric effect of monodispersed SiO₂ nanospheres limits the configuration of carbon atoms forming 3D interconnected nanotubes with uniformly distributed NiN₂ active sites. The bifunctional electrodes (Ni‐NCNT) demonstrate ideal ORR and OER properties. The zinc–air batteries assembled with Ni‐NCNT directly exhibit extremely outstanding long term stability (2250 cycles with 10 mA cm⁻² charge/discharge current density) along with high power density of 120 mV cm⁻² and specific capacity of 834.1 mA h g⁻¹. This work provides a new view to optimize the distribution of active sites and the electrode structure.

中文翻译：

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具有持久分布的NiN2活性位点和通道的高效双功能催化电极，可持久保存可充电的锌空气电池。

具有出色的氧还原反应（ORR）和氧释放反应（OER）特性的独立式双功能电极对锌空气电池具有重要意义，这归因于避免使用有机粘合剂以及与基材的牢固粘合。本文提出了一种从碳纤维纸上的预沉积镍纳米颗粒（Ni-NCNT）制造独立式双功能电极的策略。单分散SiO ₂纳米球的空间效应限制了碳原子的构型，该碳原子形成具有均匀分布的NiN _2的3D互连纳米管活动站点。双功能电极（Ni-NCNT）具有理想的ORR和OER性能。用Ni-NCNT组装的锌空气电池直接表现出极好的长期稳定性（2250次循环，充放电电流密度为10 mA cm ^-2），高功率密度为120 mV cm ^-2，比容量为834.1 mA hg ^-1。这项工作为优化活性位点的分布和电极结构提供了新的视角。