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Interconnected N/P co-doped carbon nanocage as high capacitance electrode material for energy storage devices

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Abstract

Heteroatom doping carbon materials exhibit a huge application potential for energy storage devices (ESDs). Herein, interconnected N/P co-doped carbon nanocage (NP-CNC) was synthesized from pyrene molecules by using nano-MgO as template and melamine-phytic acid supramolecular aggregate as dopant coupled with KOH activation. The as-prepared NP-CNC possesses interconnected nanocages for electron transportation and abundant micropores for ion adsorption. Moreover, co-doped N/P species in NP-CNC provide active sites and additional pseudocapacitance. Consequently, NP-CNC as electrode material for symmetric supercapacitor exhibits a high gravimetric capacitance of 435 F·g−1 at 0.05 A·g−1, high volumetric capacitance of 274 F·cm−3 at 0.032 A·cm−3, and long cycle lifespan with 96.1% capacitance retention after 50,000 cycles. Furthermore, NP-CNC as cathode for zinc-ion hybrid supercapacitor delivers satisfactory energy and power densities of 130.6 Wh·kg−1 (82.3 Wh·L−1) and 14.4 kW·kg−1 (9.1 kW·L−1). This work paves a promising approach to the preparation of high capacitance NP-CNC for ESDs.

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Acknowledgements

The authors thank the financial supports from the National Natural Science Foundation of China (Nos. 51872005, 52072002, and U1710116) and the WanJiang Scholar Program.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Anhui Key Laboratory of Coal Clean Conversion and High Valued Utilization, Key Lab of Metallurgical Emission Reduction and Resources Recycling, Ministry of Education, Anhui University of Technology, Maanshan, 243002, China

    Lei Yang, Xiaojun He, Yuchen Wei, Honghui Bi, Feng Wei & Hongqiang Li

  2. School of Material Science and Engineering, University of Jinan, Jinan, 250022, China

    Changzhou Yuan

  3. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Jieshan Qiu

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  1. Lei Yang
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  2. Xiaojun He
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Correspondence to Xiaojun He, Changzhou Yuan or Jieshan Qiu.

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Yang, L., He, X., Wei, Y. et al. Interconnected N/P co-doped carbon nanocage as high capacitance electrode material for energy storage devices. Nano Res. 15, 4068–4075 (2022). https://doi.org/10.1007/s12274-021-4003-x

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