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https://hdl.handle.net/2440/132186
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Type: | Journal article |
Title: | Tuning nitrogen species in three-dimensional porous carbon via phosphorus doping for ultra-fast potassium storage |
Author: | He, H. Huang, D. Tang, Y. Wang, Q. Ji, X. Wang, H. Guo, Z. |
Citation: | Nano Energy, 2019; 57:728-736 |
Publisher: | Elsevier |
Issue Date: | 2019 |
ISSN: | 2211-2855 2211-3282 |
Statement of Responsibility: | Hanna He, Dan Huang, Yougen Tang, Qi Wang, Xiaobo Ji, Haiyan Wang, Zaiping Guo |
Abstract: | 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. |
Keywords: | Carbonaceous materials; nitrogen species tuning; morphology design; phosphorus doping; rapid potassium storage |
Rights: | © 2019 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.nanoen.2019.01.009 |
Grant ID: | http://purl.org/au-research/grants/arc/FT150100109 http://purl.org/au-research/grants/arc/DP170102406 |
Published version: | http://dx.doi.org/10.1016/j.nanoen.2019.01.009 |
Appears in Collections: | Chemical Engineering publications |
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