Abstract
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 m2 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.
Original language | English |
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Pages (from-to) | 19460-19467 |
Number of pages | 8 |
Journal | Angewandte Chemie - International Edition |
Volume | 59 |
Issue number | 44 |
DOIs | |
State | Published - 26 Oct 2020 |
Keywords
- nitrogen doping
- porous carbon
- potassium storage
- ultrastable cycling