双功能
过电位
材料科学
析氧
普鲁士蓝
电极
空位缺陷
化学工程
碳纤维
纳米纤维
催化作用
纳米技术
电化学
化学
复合数
复合材料
结晶学
物理化学
有机化学
工程类
作者
Chenglong Lai,Haomiao Li,Yi Sangbong,Min Zhou,Wei Wang,Mingxing Gong,Kangli Wang,Kai Jiang
标识
DOI:10.1002/advs.202105925
摘要
Abstract Constructing flexible free‐standing electrodes with efficient bifunctional performance is significant for improving the performance of flexible Zinc–air batteries. Herein, a flexible free‐standing bifunctional electrode (N 2 ‐NiFe‐PBA/NCF/CC‐60) is constructed by the 3D spatial combination of CN vacancy‐mediated NiFe Prussian Blue Analogue (NiFe‐PBA) and N‐doped carbon nanofibers (NCF) rooted on carbon cloth (CC). The in situ formed CN vacancies by N 2 ‐plasma activation tune the local coordination environment and electronic structure of Ni‐Fe active sites in NiFe‐PBA, thus improving the oxygen evolution reaction (OER) catalytic intrinsic activity, and restraining the loss of Fe element during OER process. The combination of NiFe‐PBA and NCF presents a 3D interworking network structure, which exhibits a large specific surface and excellent electrical conductivity, thus guaranteeing sufficient, stable, and efficient oxygen reduction reaction (ORR)/OER active sites. Therefore, the N 2 ‐NiFe‐PBA/NCF/CC‐60 electrode delivers high‐efficiency OER activity with a low overpotential (270 mV at 50 mA cm −2 ) and excellent ORR performance with a positive potential of 0.89 V at 5 mA cm −2 . The N 2 ‐NiFe‐PBA/NCF/CC‐60 based Zn–air batteries display outstanding discharge/charge stability for 2000 cycles. Meanwhile, the corresponding flexible Zn–air batteries with satisfactory mechanical properties exhibit a low voltage gap of 0.52 V at 1.0 mA cm −2 .
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