Affiliation:
1. State Key Laboratory of Physical Chemistry of Solid Surfaces College of Materials Xiamen University Xiamen 361005 China
2. Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials Xiamen University Xiamen 361005 China
3. Xiamen Key Laboratory of High Performance Metals and Materials Xiamen University Xiamen 361005 China
Abstract
AbstractN‐doped carbons, as promising anode materials for energy storage, are generally modified by the additional heteroatoms (B, P, and S) doping to further promote the electrochemical performance. However, the promotion mechanism by such additional doping, especially its interplay with N‐containing species, remains unclear. Herein, by adopting N/S co‐doped carbon as a model system, it is found that S‐doping can significantly improve the content of pyridinic‐N, i.e., the most energetically favorable N type for K+ storage. Theoretical calculations reveal that such S‐induced pyridinic‐N improvement possibly originates from its catalytic effect that can facilitate the transition from edge quaternary‐N to pyridinic‐N. The resultant high content of pyridinic‐N, together with the additional S species, ensures abundant active sites for K+ storage. Accordingly, the N/S co‐doped carbon anode delivers both a high reversible capacity (422.9 mA h g−1 at 0.05 A g−1) and an impressive cyclic stability (249.6 mA h g−1 at 1 A g−1 over 4000 cycles). Moreover, in/ex situ characterizations further verify the merits of N/S co‐doped carbon from the perspective of compositional evolution and structural stability. This study unravels the origin of enhanced K+ storage by N/S co‐doping, which also helps to understand the synergistic effects of other heteroatoms co‐doping systems.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Fundamental Research Funds for the Central Universities
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
18 articles.
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