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Hierarchical porous carbon foam supported on carbon cloth as high-performance anodes for aqueous supercapacitors
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China.
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China.
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2019 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 439, article id 227066Article in journal (Refereed) Published
Abstract [en]

Carbon anodes have been widely utilized for the fabrication of high-performance asymmetric supercapacitors. However, they generally suffer from unsatisfactory energy density due to low specific capacitance arising from inferior conductivity and insufficient ionic diffusion rate. Here a surface modification method is conducted after the annealing of ZIF-67 precursor to produce hydrophilic, porous and heteroatom-doped carbon foam. On top of enhanced area capacitance, widened voltage window of −1.3–0 V (vs saturated calomel electrode) can be achieved through electrochemical reduction to suppress the hydrogen evolution reaction. The optimized reduced porous carbon foam on carbon cloth exhibits a maximum area capacitance of 1049 mF/cm2 at an applied current density of 12 mA/cm2 with excellent capacitance retention of 98.4% after 6000 charge-discharge cycles at 15 mA/cm2. By well pairing with hierarchical MnO2/CC cathode, a 2.3 V asymmetric supercapacitor in neutral aqueous Na2SO4 electrolyte is assembled, which delivers an exceptional energy density of up to 10.07 mWh/cm3. The procedure in this paper for carbonaceous material to simultaneously achieve considerable capacitance and enlarged voltage window can open up a wider prospect toward design of anodes for high-performance aqueous supercapacitor.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 439, article id 227066
Keywords [en]
Electro-etching, Porous carbon foam, Binder-free electrode, High-voltage supercapacitor
Identifiers
URN: urn:nbn:se:ltu:diva-75947DOI: 10.1016/j.jpowsour.2019.227066Scopus ID: 2-s2.0-85071726562OAI: oai:DiVA.org:ltu-75947DiVA, id: diva2:1350047
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-09-20

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Shifa, Tofik Ahmed

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