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Regulating B-N moieties in carbon anode toward stable and fast potassium-storage.
- Source :
-
Electrochimica Acta . Mar2024, Vol. 480, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Boron (B) and nitrogen (N) co-doped hard carbons usually tend to deliver an excellent rate and ultra-long cycle lifespan, because of the formed B-N moieties can accelerate both ion/electron transfer. However, the rational regulation of B-N moieties content is rarely mentioned, and correlating rate and reversible capacity with B-N moieties content is still lacking yet. Hence, a series of B/N co-doped hard carbons are designed based on varied carbonization temperatures. Systematic characterizations prove that the introduced B-heteroatoms can create more defects and form well-developed pore channels. Besides, with increasing carbonization temperatures, B-N moieties content first increases and then decreases, which is in accordance with the evolution of defect degree of carbon matrix. Therefore, rich B-N moieties can induce more defect sites to greatly improve capacitive contribution, and as a result both rate and reversible capacity are strongly correlated with B-N moieties content. Based on this, the electrode with the highest B-N moieties content (79.6 %) realizes an excellent rate (220.9 mAh g−1 at 2 A g−1) and cycling stability (over 2000 cycles). Note that the storage of B-N moieties on K + only occurs in a high potential region (>0.5 V), and this process is highly reversible. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 480
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 175524227
- Full Text :
- https://doi.org/10.1016/j.electacta.2024.143883