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Boosting pseudocapacitive charge storage in in-situ functionalized carbons with high surface area for high-energy asymmetric supercapacitors

Abstract

Achieving both high surface area and high heteroatom doping in carbon materials is a major challenge for aqueous-based supercapacitors. Herein, we choose an efficient carbonization-activation pathway to tune the porosity and heteroatom doping level of carbon materials by using jelly fish as the precursor and KOH as the activating agent. The High Functionalized Jelly fish Derived Activated Carbons (HFJDACs) possess a high surface area of up to 3300 m2 g-1 with nitrogen and oxygen heteroatom doping. Carbon activated at 500 oC displays a capacitance as ultrahigh as 743 F g-1 and 639 F cm-3, while carbons activated at higher than 500 oC exhibit a favorable capacitance retention of > 48.1 % at 100 A g-1. These values are among the highest reported in the literatures, which can use as the ideal negative electrode in asymmetric supercapacitors to circumvent the capacitance mismatch between oxide-based positive electrode and carbon-based negative electrode. The assembled asymmetric capacitor employing HFJDACs can achieve a high energy density of 43.4 W h kg-1 and an amazing cycle life with capacitance retention of 110% after 20,000 cycles. These results demonstrate that adapting a scalable synthesis strategy for designing carbons with well-developed porosity and high level heteroatom doping is promising for advanced supercapacitors.

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Publication details

The article was received on 13 Jul 2018, accepted on 07 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8SE00348C
Citation: Sustainable Energy Fuels, 2018, Accepted Manuscript
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    Boosting pseudocapacitive charge storage in in-situ functionalized carbons with high surface area for high-energy asymmetric supercapacitors

    H. Zhang, M. Lu, H. Wang, Y. Lyu, D. Li, S. Sun, J. Shi and W. Liu, Sustainable Energy Fuels, 2018, Accepted Manuscript , DOI: 10.1039/C8SE00348C

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