Abstract
Steam-assistant nitrogen (N) and phosphorus (P) co-doping of graphene (s-NPG) architectures are constructed by a facile chemical converted method and thermal activation. Steam-activation treatment can provide abundant porous structure for fast ion diffusion and expose more electrochemical active-sites for surface faradic reaction. The wrinkled surface of S-NPG with a large surface area is probed by microscopic analysis. The spectroscopic analysis confirms the existence of pyridinic-N and C-P-O bonds for s-NPG, which are the dominant electroactive sites for accommodating the protons or charges. Therefore, s-NPG exhibits a high specific capacitance of 317 F g−1 at 1 A g−1 with a good rate capability of 87% and cyclic stability of 97.7% after 20,000 cycles. The excellent pseudocapacitive behavior can be attributed to the synergistic effect of hierarchical structure with and surface modification by N and P dual-doping. The simple steam-assistant treatment can be a potential way to construct the hierarchically structured electrode materials for supercapacitors.
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Acknowledgments
This work is supported by the Projects of Science and Technology Department of Guizhou Province ([2017] 1081, [2018] 1085), and the Science and Technology Platform Talent Plan of Guizhou Province ([2018] 5773-YB13). Xu Yu also thanks the support of Natural Science Foundation of the Jiangsu Higher Education Institutions of China (18KJB150034). We also acknowledge the technical support at Testing Center of Yangzhou University.
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Wang, C., Zhao, J., Luo, S. et al. Improved Pseudocapacitive Performance of Graphene Architectures Modulating by Nitrogen/Phosphorus Dual-Doping and Steam-Activation. Macromol. Res. 29, 582–588 (2021). https://doi.org/10.1007/s13233-021-9075-7
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DOI: https://doi.org/10.1007/s13233-021-9075-7