双功能
材料科学
双金属片
柯肯德尔效应
沸石咪唑盐骨架
静电纺丝
电催化剂
纳米纤维
化学工程
纳米技术
电池(电)
析氧
碳纤维
催化作用
阴极
电极
金属有机骨架
聚合物
化学
复合材料
冶金
电化学
有机化学
复合数
功率(物理)
吸附
物理化学
工程类
物理
金属
量子力学
作者
Xing Chen,Jie Pu,Xuhui Hu,Le An,Jianjun Jiang,Yujun Li
出处
期刊:Nano Research
[Springer Nature]
日期:2022-07-18
卷期号:15 (10): 9000-9009
被引量:14
标识
DOI:10.1007/s12274-022-4563-4
摘要
Zn-air batteries with high energy density and safety have acquired enormous attention, while the practical application is hindered by the sluggish kinetics of the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR). In this work, a three-dimensional (3D) defect-rich bifunctional electrocatalyst (CoFe/N CNFs) comprising irregular hollow CoFe nanospheres in N-doped carbon nanofibers is presented, which is fabricated from CoFe ZIFs-derived (ZIF: zeolitic-imidazolate framework) polymer nanofibers precursor. The CoFe ZIFs with tunable particle size and composition are constructed using a confined synthesis strategy. Moreover, the Kirkendall diffusion process is available for forming the irregular hollow CoFe nanospheres, and the decomposition of polyvinylpyrrolidone (PVP) results in forming the defective carbon nanofibers, which provide more efficient active sites and enhance the electrocatalytic properties toward both OER and ORR. The optimized CoFe/N CNFs exhibit superior bifunctional activities, outperforming that of the benchmark Pt/C + RuO2 catalyst. As a result, the CoFe/N CNFs as an air-cathode endow the rechargeable Zn-air battery with an excellent power density of 149 mW·cm−2, energy density of 875 Wh·kg−1, and cycling stability. This work provides a new strategy to develop bifunctional electrocatalysts with desired nanostructure and regulated performance toward energy applications.
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