双功能
电催化剂
材料科学
过电位
碳纳米管
催化作用
化学工程
析氧
纳米颗粒
介孔材料
碳纤维
合金
纳米技术
电极
无机化学
电化学
化学
复合材料
有机化学
复合数
物理化学
工程类
作者
Junxue Chen,Jie Zhu,Sijia Li,Zhonglin Li,Chengzhi Wu,Ding Wang,Zhihong Luo,Yibing Li,Zhihong Luo
出处
期刊:Dalton Transactions
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:51 (38): 14498-14507
被引量:7
摘要
The rational design and exploration of low-cost, highly efficient, and robust bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) electrocatalysts are essential for the application of zinc-air batteries. Herein, a novel highly active and stable oxygen electrode catalyst is designed based on in situ construction of FeCo alloy nanoparticles embedded in nitrogen-doped carbon nanotubes (FeCo/N-CNTs-800) with a bamboo-like structure. The unique architecture of bamboo-like nanotubes, the large surface area with abundant mesoporous structure, and the strong coupling interactions between the encapsulated alloy nanoparticle core and the nitrogen-doped graphitic carbon shell synergistically enhance the electrocatalytic activity. As a result, FeCo/N-CNTs-800 exhibits remarkable ORR (with a half-wave potential of 0.891 V in 0.1 M KOH) and OER (with an overpotential of 359 mV to deliver 10 mA cm-2 in 1 M KOH) performance, respectively. More impressively, an assembled zinc-air battery with the bifunctional FeCo/N-CNTs-800 catalyst as the air electrode demonstrates a large power density of 200.4 mW cm-2 and robust cycling performance over 445 h compared to precious-metal catalysts Pt/C∥IrO2. Thus, the electrocatalyst presented in this work holds great potential as an air cathode for practical applications of zinc-air batteries.
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