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Activated graphene-based carbons as supercapacitor electrodes with macro- and mesopores.
ACS Nano. 2013 Aug 27; 7(8):6899-905.AN

Abstract

Electric double layer capacitors (or supercapacitors) store charges through the physisorption of electrolyte ions onto porous carbon electrodes. The control over structure and morphology of carbon electrode materials is therefore an effective strategy to render them high surface area and efficient paths for ion diffusion. Here we demonstrate the fabrication of highly porous graphene-derived carbons with hierarchical pore structures in which mesopores are integrated into macroporous scaffolds. The macropores were introduced by assembling graphene-based hollow spheres, and the mesopores were derived from the chemical activation with potassium hydroxide. The unique three-dimensional pore structures in the produced graphene-derived carbons give rise to a Brunauer-Emmett-Teller surface area value of up to 3290 m(2) g(-1) and provide an efficient pathway for electrolyte ions to diffuse into the interior surfaces of bulk electrode particles. These carbons exhibit both high gravimetric (174 F g(-1)) and volumetric (~100 F cm(-3)) specific capacitance in an ionic liquid electrolyte in acetonitrile. The energy density and power density of the cell assembled with this carbon electrode are also high, with gravimetric values of 74 Wh kg(-1) and 338 kW kg(-1) and volumetric values of 44 Wh L(-1) and 199 kW L(-1), respectively. The supercapacitor performance achieved with these graphene-derived carbons is attributed to their unique pore structure and makes them potentially promising for diverse energy storage devices.

Authors+Show Affiliations

Department of Mechanical Engineering and Materials Science and Engineering Program, University of Texas at Austin, One University Station C2200, Austin, Texas 78712, United States.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

23829569

Citation

Kim, Taeyoung, et al. "Activated Graphene-based Carbons as Supercapacitor Electrodes With Macro- and Mesopores." ACS Nano, vol. 7, no. 8, 2013, pp. 6899-905.
Kim T, Jung G, Yoo S, et al. Activated graphene-based carbons as supercapacitor electrodes with macro- and mesopores. ACS Nano. 2013;7(8):6899-905.
Kim, T., Jung, G., Yoo, S., Suh, K. S., & Ruoff, R. S. (2013). Activated graphene-based carbons as supercapacitor electrodes with macro- and mesopores. ACS Nano, 7(8), 6899-905. https://doi.org/10.1021/nn402077v
Kim T, et al. Activated Graphene-based Carbons as Supercapacitor Electrodes With Macro- and Mesopores. ACS Nano. 2013 Aug 27;7(8):6899-905. PubMed PMID: 23829569.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Activated graphene-based carbons as supercapacitor electrodes with macro- and mesopores. AU - Kim,Taeyoung, AU - Jung,Gyujin, AU - Yoo,Seonmi, AU - Suh,Kwang S, AU - Ruoff,Rodney S, Y1 - 2013/07/15/ PY - 2013/7/9/entrez PY - 2013/7/9/pubmed PY - 2013/7/9/medline SP - 6899 EP - 905 JF - ACS nano JO - ACS Nano VL - 7 IS - 8 N2 - Electric double layer capacitors (or supercapacitors) store charges through the physisorption of electrolyte ions onto porous carbon electrodes. The control over structure and morphology of carbon electrode materials is therefore an effective strategy to render them high surface area and efficient paths for ion diffusion. Here we demonstrate the fabrication of highly porous graphene-derived carbons with hierarchical pore structures in which mesopores are integrated into macroporous scaffolds. The macropores were introduced by assembling graphene-based hollow spheres, and the mesopores were derived from the chemical activation with potassium hydroxide. The unique three-dimensional pore structures in the produced graphene-derived carbons give rise to a Brunauer-Emmett-Teller surface area value of up to 3290 m(2) g(-1) and provide an efficient pathway for electrolyte ions to diffuse into the interior surfaces of bulk electrode particles. These carbons exhibit both high gravimetric (174 F g(-1)) and volumetric (~100 F cm(-3)) specific capacitance in an ionic liquid electrolyte in acetonitrile. The energy density and power density of the cell assembled with this carbon electrode are also high, with gravimetric values of 74 Wh kg(-1) and 338 kW kg(-1) and volumetric values of 44 Wh L(-1) and 199 kW L(-1), respectively. The supercapacitor performance achieved with these graphene-derived carbons is attributed to their unique pore structure and makes them potentially promising for diverse energy storage devices. SN - 1936-086X UR - https://www.unboundmedicine.com/medline/citation/23829569/Activated_graphene_based_carbons_as_supercapacitor_electrodes_with_macro__and_mesopores_ L2 - https://dx.doi.org/10.1021/nn402077v DB - PRIME DP - Unbound Medicine ER -
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