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Three-dimensional ordered macroporous MnO2/carbon nanocomposites as high-performance electrodes for asymmetric supercapacitors.
Phys Chem Chem Phys 2013; 15(45):19730-40PC

Abstract

MnO2/carbon composites with ultrathin MnO2 nanofibers (diameter of 5-10 nm) uniformly deposited on three dimensional ordered macroporous (3DOM) carbon frameworks were fabricated via a self-limiting redox process. The MnO2 nanofibers provide a large surface area for charge storage, whereas the 3DOM carbon serves as a desirable supporting material providing rapid ion and electron transport through the composite electrodes. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) were used to characterize the capacitive performance of these composites. Optimization of the composition results in a composite with 57 wt% MnO2 content, which gives both a high specific capacitance (234 F g(-1) at a discharge current of 0.1 A g(-1)) and good rate capability (52% retention of the capacitance at 5 A g(-1)). An asymmetric supercapacitor was fabricated by assembling the optimized MnO2/carbon composite as the positive electrode and 3DOM carbon as the negative electrode. The asymmetric supercapacitor exhibits superior electrochemical performances, which can be reversibly charged and discharged at a maximum cell voltage of 2.0 V in 1.0 M Na2SO4 aqueous electrolyte, delivering both high energy density (30.2 W h kg(-1)) and power density (14.5 kW kg(-1)). Additionally, the asymmetric supercapacitor exhibits an excellent cycle life, with 95% capacitance retained after 1000 cycles.

Authors+Show Affiliations

CYM Chemistry Building, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong S.A.R. chunzhen@hku.hk.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

24141452

Citation

Yang, Chunzhen, et al. "Three-dimensional Ordered Macroporous MnO2/carbon Nanocomposites as High-performance Electrodes for Asymmetric Supercapacitors." Physical Chemistry Chemical Physics : PCCP, vol. 15, no. 45, 2013, pp. 19730-40.
Yang C, Zhou M, Xu Q. Three-dimensional ordered macroporous MnO2/carbon nanocomposites as high-performance electrodes for asymmetric supercapacitors. Phys Chem Chem Phys. 2013;15(45):19730-40.
Yang, C., Zhou, M., & Xu, Q. (2013). Three-dimensional ordered macroporous MnO2/carbon nanocomposites as high-performance electrodes for asymmetric supercapacitors. Physical Chemistry Chemical Physics : PCCP, 15(45), pp. 19730-40. doi:10.1039/c3cp53504e.
Yang C, Zhou M, Xu Q. Three-dimensional Ordered Macroporous MnO2/carbon Nanocomposites as High-performance Electrodes for Asymmetric Supercapacitors. Phys Chem Chem Phys. 2013 Dec 7;15(45):19730-40. PubMed PMID: 24141452.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Three-dimensional ordered macroporous MnO2/carbon nanocomposites as high-performance electrodes for asymmetric supercapacitors. AU - Yang,Chunzhen, AU - Zhou,Ming, AU - Xu,Qian, Y1 - 2013/10/21/ PY - 2013/10/22/entrez PY - 2013/10/22/pubmed PY - 2013/10/22/medline SP - 19730 EP - 40 JF - Physical chemistry chemical physics : PCCP JO - Phys Chem Chem Phys VL - 15 IS - 45 N2 - MnO2/carbon composites with ultrathin MnO2 nanofibers (diameter of 5-10 nm) uniformly deposited on three dimensional ordered macroporous (3DOM) carbon frameworks were fabricated via a self-limiting redox process. The MnO2 nanofibers provide a large surface area for charge storage, whereas the 3DOM carbon serves as a desirable supporting material providing rapid ion and electron transport through the composite electrodes. Cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) were used to characterize the capacitive performance of these composites. Optimization of the composition results in a composite with 57 wt% MnO2 content, which gives both a high specific capacitance (234 F g(-1) at a discharge current of 0.1 A g(-1)) and good rate capability (52% retention of the capacitance at 5 A g(-1)). An asymmetric supercapacitor was fabricated by assembling the optimized MnO2/carbon composite as the positive electrode and 3DOM carbon as the negative electrode. The asymmetric supercapacitor exhibits superior electrochemical performances, which can be reversibly charged and discharged at a maximum cell voltage of 2.0 V in 1.0 M Na2SO4 aqueous electrolyte, delivering both high energy density (30.2 W h kg(-1)) and power density (14.5 kW kg(-1)). Additionally, the asymmetric supercapacitor exhibits an excellent cycle life, with 95% capacitance retained after 1000 cycles. SN - 1463-9084 UR - https://www.unboundmedicine.com/medline/citation/24141452/Three_dimensional_ordered_macroporous_MnO2/carbon_nanocomposites_as_high_performance_electrodes_for_asymmetric_supercapacitors_ L2 - https://doi.org/10.1039/c3cp53504e DB - PRIME DP - Unbound Medicine ER -