双功能
锌
石墨烯
析氧
材料科学
双功能催化剂
氧气
电池(电)
阴极
阳极
纳米技术
化学工程
无机化学
化学
催化作用
电极
冶金
电化学
有机化学
工程类
物理化学
功率(物理)
物理
量子力学
作者
Wenjie Duan,Chen Wang,Peng Sun,Yinggang Sun,Yanqiong Zhuang,Jigang Wang,Guohong Liu
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2023-09-08
卷期号:6 (18): 16662-16673
被引量:8
标识
DOI:10.1021/acsanm.3c02878
摘要
The evolution of highly active dual-functional catalysts is critical to zinc–air batteries (ZAB). Herein, three-dimensional Fe–N/P-co-doped graphene (3D Fe–N/P-G) materials with a high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) response are prepared by a molten salt protection method with KCl. The 3D Fe–N/P-G exhibits a large Brunauer–Emmett–Teller (BET) surface area and a dense network of pores for improved mass transfer efficiency. The addition of P atoms is able to produce a synergistic effect that improves the ORR catalytic activity of the 3D Fe–N/P-G catalyst. Regarding electrical efficiency, the ORR half-wave potential (E1/2) of 3D Fe–N/P-G catalytic is 0.860 V vs reversible hydrogen electrode (RHE) and the electron transfer number is 3.98 from 0.4 to 0.7 V vs RHE. The small overvoltage (ΔE = Ej = 10 – E1/2) of 3D Fe–N/P-G is 0.77 V. Additionally, the zinc–air battery with 3D Fe–N/P-G as a trigger for the cathode has high power density (170 mW cm–2), specific capacity (671 mAh g–1), small charge/discharge polarization, and outstanding prolonged stability. It is suggested that 3D Fe–N/P-G is a powerful bifunctional cathode ZAB catalyst.
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