Journal
NANO ENERGY
Volume 57, Issue -, Pages 728-736Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.01.009
Keywords
Carbonaceous materials; Nitrogen species tuning; Morphology design; Phosphorus doping; Rapid potassium storage
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Funding
- Hunan Provincial Science and Technology Plan Project of China [2017TP1001, 2018JJ4002]
- Innovation-Driven Project of Central South University [2016CXS009]
- Australian Research Council (ARC) [FT150100109, DP170102406]
- China Scholarship Council (CSC) [201706370168]
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Carbonaceous materials have been proved to be promising materials for energy storage. Heteroatom doping, especially N doping, could further promote their electrochemical performance, and the type of doped N configuration plays a key role in determining the reactivity of doped carbon. However, achieving a high proportion of active N (pyridinic N) in N doped carbon is still a big challenge. In this work, we successfully tuned the N species and achieved high-level pyridinic N in carbon via constructing a three-dimensional (3D) honeycomb-like structure in conjunction with phosphorus doping. The 3D porous structure with sufficient pore defects and edges provides the preconditions for the formation of pyridinic N, and the subsequent P-doping leads to more open edge sites, which further facilitate the formation of pyridinic N. This modification greatly promoted the reactivity of the carbon framework, contributing to rapid interfacial K+ adsorption reactions. The as-obtained P-doped N-rich honeycomb-like carbon thus achieved ultrahigh reversible capacity and outstanding rate capability (with capacities of 419.3 and 270.4 mA h g(-1) obtained at 100 and 1000 mA g(-1), respectively). This outstanding performance demonstrates that adjusting the proportion of active N in N-doped carbon offers a promising approach toward excellent N-doped carbon materials for energy storage systems.
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