Efficient Bifunctional Catalytic Electrodes with Uniformly Distributed NiN2 Active Sites and Channels for Long-Lasting Rechargeable Zinc-Air Batteries.
Efficient Bifunctional Catalytic Electrodes with Uniformly Distributed NiN2 Active Sites and Channels for Long-Lasting Rechargeable Zinc-Air Batteries.
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DOI：
10.1002/smll.202002518
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发表时间：
2020-07
期刊：
影响因子：
13.3
通讯作者：
Zihe Cai;Shengxuan Lin;Jiajia Xiao;T. Muhmood;Yuhang Chen;Yifan Wang;Xiaobing Hu;Lirong Zheng-
中科院分区：
文献类型：
--
作者：
Zihe Cai;Shengxuan Lin;Jiajia Xiao;T. Muhmood;Yuhang Chen;Yifan Wang;Xiaobing Hu;Lirong Zheng-
具有优异的氧还原反应（ORR）和析氧反应（OER）性能的自支撑双功能电极对于锌-空气电池具有重要意义，这归因于避免使用有机粘合剂和与基底的强粘附性。在此，开发了一种策略，以制造独立的双功能电极从预沉积的镍纳米粒子（Ni-NCNT）的碳纤维纸。单分散SiO2纳米球的空间效应限制了碳原子的构型，形成具有均匀分布的NiN 2活性位点的3D互连纳米管。双功能电极（Ni-NCNT）表现出理想的ORR和OER性能。直接用Ni-NCNT组装的锌-空气电池表现出极其出色的长期稳定性（在10 mA cm-2充电/放电电流密度下2250次循环），沿着具有120 mV cm-2的高功率密度和834.1 mA h g-1的比容量。这为优化活性中心分布和电极结构提供了新的视角。
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.