Rechargeable Zn-Air Batteries with Outstanding Cycling Stability Enabled by Ultrafine FeNi Nanoparticles-Encapsulated N-Doped Carbon Nanosheets as a Bifunctional Electrocatalyst.
Rechargeable Zn-Air Batteries with Outstanding Cycling Stability Enabled by Ultrafine FeNi Nanoparticles-Encapsulated N-Doped Carbon Nanosheets as a Bifunctional Electrocatalyst.
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DOI：
10.1021/acs.nanolett.1c00279
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发表时间：
2021-04
期刊：
影响因子：
10.8
通讯作者：
Xufeng Li;Yijiang Liu;Hongbiao Chen;Mei Yang;Duanguang Yang;Hua-ming Li;Zhiqun Lin
中科院分区：
文献类型：
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作者：
Xufeng Li;Yijiang Liu;Hongbiao Chen;Mei Yang;Duanguang Yang;Hua-ming Li;Zhiqun Lin
尽管近年来锌-空气电池取得了巨大进展，但其商业化仍然具有挑战性，主要是由于缺乏有效的双功能氧催化剂。在此，我们报告了一种用于高效锌空气电池的双功能电催化剂的工艺，该双功能电催化剂包括封装在N掺杂的层状碳纳米片（表示为FeNi/N-LCN）内的超细合金化FeNi纳米颗粒。通过含三苯基咪唑的聚苯胺（TPANI）低聚物与含Fe和Ni的前体配位，然后与三聚氰胺进行氢键结合，再热解得到FeNi/N-LCN电催化剂。所制备的FeNi/N-LCN对氧还原反应（ORR）和析氧反应（OER）均表现出优异的活性和稳定性。用FeNi/N-LCN组装的一次锌空气电池具有高比容量和峰值功率密度。值得注意的是，可再充电锌-空气电池可以在5 mA cm-2下重复充电和放电1100小时和在10 mA cm-2下重复充电和放电600小时，代表了各种已报道的锌-空气电池中最高的循环稳定性。
Despite grand advances in Zn-air batteries in recently years, their commercialization remains challenging due largely to the lack of efficient bifunctional oxygen catalysts. Herein, we report the crafting of a bifunctional electrocatalyst comprising ultrafine alloyed FeNi nanoparticles encapsulated within N-doped layered carbon nanosheets (denoted FeNi/N-LCN) for high-efficiency Zn-air batteries. The FeNi/N-LCN electrocatalyst is yielded via the coordination of triphenylimidazole-containing polyaniline (TPANI) oligomer with Fe- and Ni-containing precursors, followed by hydrogen binding with melamine and subsequent pyrolysis. The as-constructed FeNi/N-LCN manifests outstanding activity and stability toward both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The primary Zn-air battery assembled with FeNi/N-LCN delivers both high specific capacity and peak power density. Remarkably, the rechargeable Zn-air battery can be repeatedly charged and discharged for 1100 h at 5 mA cm-2 and for 600 h at 10 mA cm-2, representing the highest cycling stability among various reported Zn-air batteries.