催化作用
兴奋剂
碳纤维
材料科学
质子交换膜燃料电池
氧气
金属
钴
无机化学
化学工程
化学
有机化学
冶金
复合材料
光电子学
复合数
工程类
作者
Diancheng Duan,Junlang Huo,Jiaxiang Chen,Bin Chi,Zhangsen Chen,Shuhui Sun,Yang Zhao,He Zhao,Zhiming Cui,Shijun Liao
出处
期刊:Small
[Wiley]
日期:2024-01-08
卷期号:20 (25)
被引量:2
标识
DOI:10.1002/smll.202310491
摘要
Abstract Single‐atom metal‐doped M–N–C (M═Fe, Co, Mn, or Ni) catalysts exhibit excellent catalytic activity toward oxygen reduction reactions (ORR). However, their performance still has a large gap considering the demand for their practical applications. This study reports a high‐performance dual single‐atom doped carbon catalyst (HfCo–N–C), which is prepared by pyrolyzing Co and Hf co‐doped ZIF‐8 . Co and Hf are atomically dispersed in the carbon framework and coordinated with N to form Co–N 4 and Hf–N 4 active moieties. The synergetic effect between Co–N 4 and Hf–N 4 significantly enhance the catalytic activity and durability of the catalyst. In an acidic medium, the ORR half‐wave potential ( E 1/2 ) of the catalyst is up to 0.82 V , which is much higher than that of the Co–N–C catalyst without Hf co‐doping (0.80 V). The kinetic current density of the catalyst is up to 2.49 A cm −2 at 0.85 V , which is 1.74 times that of the Co–N–C catalyst without Hf co‐doping. Moreover, the catalyst exhibits excellent cathodic performance in single proton exchange membrane fuel cells and Zn–air batteries. Furthermore, Hf co‐doping can effectively suppress the formation of H 2 O 2 , resulting in significantly improved stability and durability.
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