期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202116290
关键词
Heterostructures; Intermolecular Electron Transfer; Nanocages; Oxygen Reduction Reaction; Synergistic Effects
资金
- National Natural Science Foundation of China [21835007, 52172110]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [ZDBS-LYSLH029]
- Scientific and Technical Innovation Action Plan Hong Kong, Macao and Taiwan Science & Technology Cooperation Project of Shanghai Science and Technology Committee [21520760500]
- Natural Science Foundation of Shanghai [19ZR1479400]
- Super postdoctoral Incentive Program of Shanghai Municipal Human Resources and Social Security Bureau [2020475]
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology)
N-doped carbon materials with trace amounts of iron show excellent ORR activity and durability without significant contribution by the metal sites. The materials have a unique hollow and hierarchically porous architecture, as well as a noncovalently bonded N-deficient/N-rich heterostructure.
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 H-2-O-2 fuel cell reaches 486 mW cm(-2), which is comparable to and even better than those using conventional Fe-N-C catalysts at cathodes.
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