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- Title
N‐Doped Carbon Electrocatalyst: Marked ORR Activity in Acidic Media without the Contribution from Metal Sites?
- Authors
Kong, Fantao; Cui, Xiangzhi; Huang, Yifan; Yao, Heliang; Chen, Yafeng; Tian, Han; Meng, Ge; Chen, Chang; Chang, Ziwei; Shi, Jianlin
- Abstract
Fe−N−C electrocatalysts have been demonstrated to be the most promising substitutes for benchmark Pt/C catalysts for the oxygen reduction reaction (ORR). Herein, we report that N‐doped carbon materials with trace amounts of iron (0–0.08 wt. %) show excellent ORR activity and durability comparable and even superior to those of Pt/C in both alkaline and acidic media without significant contribution by the metal sites. Such an N‐doped carbon (denoted as N‐HPCs) features a hollow and hierarchically porous architecture, and more importantly, a noncovalently bonded N‐deficient/N‐rich heterostructure providing the active sites for oxygen adsorption and activation owing to the efficient electron transfer between the layers. The primary Zn‐air battery using N‐HPCs as the cathode delivers a much higher power density of 158 mW cm−2, and the maximum power density in the H2−O2 fuel cell reaches 486 mW cm−2, which is comparable to and even better than those using conventional Fe−N−C catalysts at cathodes.
- Subjects
OXYGEN reduction; METALS; CHARGE exchange; POWER density; IRON; CARBON
- Publication
Angewandte Chemie, 2022, Vol 134, Issue 15, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202116290