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Vertically stacked bilayer CuCo2O4/MnCO2O4 heterostructures on functionalized graphite paper for high performance electrochemical capacitors

Title
Vertically stacked bilayer CuCo2O4/MnCO2O4 heterostructures on functionalized graphite paper for high performance electrochemical capacitors
Author
Hui, Kwan-San
Keywords
DENSITY ASYMMETRIC SUPERCAPACITORS; REDUCED GRAPHENE OXIDE; LARGE-SCALE SYNTHESIS; LITHIUM-ION BATTERY; FACILE SYNTHESIS; NANOWIRE ARRAYS; OXYGEN REDUCTION; ENERGY-STORAGE; NI FOAM; ELECTRODES
Issue Date
2016-06
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v, 4, no.21, Page. 8061-8071
Abstract
Cobaltite systems with spinet structures are promising cathode materials for next-generation high-performance electrochemical capacitors because of their high electrochemical stability. However, increasing the mass loading of active materials without sacrificing the geometry of the nanostructures remains a challenge. In this study, we propose vertically stacked bilayer spinet heterostructures constructed from hierarchical CuCo2O4/MnCo2O4 on graphite paper as highly capable supercapacitor electrodes. A two-step hydrothermal method with post annealing treatment is used in the preparation of the heterostructures. The CuCo2O4/MnCo2O4 electrode delivers a remarkable specific capacitance of 1434 F g(-1) at 0.5 A g(-1), considerable high-rate capability (810 F g(-1) at 15 A g(-1)), and an excellent cycling stability, maintaining 81.4% at 10 A g(-1) after 5000 cycles. An electrochemical capacitor device operating at 1.6 V is also constructed using CuCo2O4/MnCo2O4 and graphene as positive and negative electrodes, respectively. The device shows a high energy density of 42.1 W h kg(-1) at a power density of 400 W kg(-1), as well as good cycling stability (88.4% retention after 10 000 cycles). The concept of stacking heteronanostructures can potentially enrich the electrochemical performance of metal oxides for next generation electrochemical capacitors.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2016/TA/C6TA00960C#!divAbstracthttps://repository.hanyang.ac.kr/handle/20.500.11754/72522
ISSN
2050-7488; 2050-7496
DOI
10.1039/c6ta00960c
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ETC[S] > 연구정보
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