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High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2.
ACS Appl Mater Interfaces 2012; 4(5):2801-10AA

Abstract

We have successfully fabricated an asymmetric supercapacitor with high energy and power densities using graphene hydrogel (GH) with 3D interconnected pores as the negative electrode and vertically aligned MnO(2) nanoplates on nickel foam (MnO(2)-NF) as the positive electrode in a neutral aqueous Na(2)SO(4) electrolyte. Because of the desirable porous structure, high specific capacitance and rate capability of GH and MnO(2)-NF, complementary potential window of the two electrodes, and the elimination of polymer binders and conducting additives, the asymmetric supercapacitor can be cycled reversibly in a wide potential window of 0-2.0 V and exhibits an energy density of 23.2 Wh kg(-1) with a power density of 1.0 kW kg(-1). Energy density of the asymmetric supercapacitor is significantly improved in comparison with those of symmetric supercapacitors based on GH (5.5 Wh kg(-1)) and MnO(2)-NF (6.7 Wh kg(-1)). Even at a high power density of 10.0 kW kg(-1), the asymmetric supercapacitor can deliver a high energy density of 14.9 Wh kg(-1). The asymmetric supercapacitor also presents stable cycling performance with 83.4% capacitance retention after 5000 cycles.

Authors+Show Affiliations

School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

22545683

Citation

Gao, Hongcai, et al. "High-performance Asymmetric Supercapacitor Based On Graphene Hydrogel and Nanostructured MnO2." ACS Applied Materials & Interfaces, vol. 4, no. 5, 2012, pp. 2801-10.
Gao H, Xiao F, Ching CB, et al. High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2. ACS Appl Mater Interfaces. 2012;4(5):2801-10.
Gao, H., Xiao, F., Ching, C. B., & Duan, H. (2012). High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2. ACS Applied Materials & Interfaces, 4(5), pp. 2801-10. doi:10.1021/am300455d.
Gao H, et al. High-performance Asymmetric Supercapacitor Based On Graphene Hydrogel and Nanostructured MnO2. ACS Appl Mater Interfaces. 2012;4(5):2801-10. PubMed PMID: 22545683.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - High-performance asymmetric supercapacitor based on graphene hydrogel and nanostructured MnO2. AU - Gao,Hongcai, AU - Xiao,Fei, AU - Ching,Chi Bun, AU - Duan,Hongwei, Y1 - 2012/05/04/ PY - 2012/5/2/entrez PY - 2012/5/2/pubmed PY - 2012/5/2/medline SP - 2801 EP - 10 JF - ACS applied materials & interfaces JO - ACS Appl Mater Interfaces VL - 4 IS - 5 N2 - We have successfully fabricated an asymmetric supercapacitor with high energy and power densities using graphene hydrogel (GH) with 3D interconnected pores as the negative electrode and vertically aligned MnO(2) nanoplates on nickel foam (MnO(2)-NF) as the positive electrode in a neutral aqueous Na(2)SO(4) electrolyte. Because of the desirable porous structure, high specific capacitance and rate capability of GH and MnO(2)-NF, complementary potential window of the two electrodes, and the elimination of polymer binders and conducting additives, the asymmetric supercapacitor can be cycled reversibly in a wide potential window of 0-2.0 V and exhibits an energy density of 23.2 Wh kg(-1) with a power density of 1.0 kW kg(-1). Energy density of the asymmetric supercapacitor is significantly improved in comparison with those of symmetric supercapacitors based on GH (5.5 Wh kg(-1)) and MnO(2)-NF (6.7 Wh kg(-1)). Even at a high power density of 10.0 kW kg(-1), the asymmetric supercapacitor can deliver a high energy density of 14.9 Wh kg(-1). The asymmetric supercapacitor also presents stable cycling performance with 83.4% capacitance retention after 5000 cycles. SN - 1944-8252 UR - https://www.unboundmedicine.com/medline/citation/22545683/High_performance_asymmetric_supercapacitor_based_on_graphene_hydrogel_and_nanostructured_MnO2_ L2 - https://dx.doi.org/10.1021/am300455d DB - PRIME DP - Unbound Medicine ER -