期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 44, 页码 19460-19467出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202005118
关键词
nitrogen doping; porous carbon; potassium storage; ultrastable cycling
资金
- NSFC [51972270, 51702262, 51872240, 51911530212, 51672225]
- 111 project [B17020]
- Natural Science Foundation of Shaanxi Province [2020JZ-07]
- Fundamental Research Funds for the Central Universities [3102019JC005, 3102019ghxm004]
- Research Fund of the State Key Laboratory of Solidification Processing (NPU), China [2019-QZ-03]
- Alexander von Humboldt Foundation
- 1000 Youth Talent Program of China
- DFG [KA 1698/27-1]
The development of ultrastable carbon materials for potassium storage poses key limitations caused by the huge volume variation and sluggish kinetics. Nitrogen-enriched porous carbons have recently emerged as promising candidates for this application; however, rational control over nitrogen doping is needed to further suppress the long-term capacity fading. Here we propose a strategy based on pyrolysis-etching of a pyridine-coordinated polymer for deliberate manipulation of edge-nitrogen doping and specific spatial distribution in amorphous high-surface-area carbons; the obtained material shows an edge-nitrogen content of up to 9.34 at %, richer N distribution inside the material, and high surface area of 616 m(2) g(-1) under a cost-effective low-temperature carbonization. The optimized carbon delivers unprecedented K-storage stability over 6000 cycles with negligible capacity decay (252 mA h g(-1) after 4 months at 1 A g(-1)), rarely reported for potassium storage.
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