Engineering one-dimensional and two-dimensional birnessite manganese dioxides on nickel foam-supported cobalt–aluminum layered double hydroxides for advanced binder-free supercapacitors
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Abstract© The Royal Society of Chemistry. We report a facile decoration of the hierarchical nickel foam-supported CoAl layered double hydroxides (CoAl LDHs) with MnO2 nanowires and nanosheets by a chemical bath method and a hydrothermal approach for high-performance supercapacitors. We demonstrate that owing to the sophisticated configuration of binder-free LDH@MnO2 on the conductive Ni foam (NF), the designed NF/LDH@MnO2 nanowire composites exhibit a highly boosted specific capacitance of 1837.8 F g-1 at a current density of 1 A g-1, a good rate capability, and an excellent cycling stability (91.8% retention after 5000 cycles). By applying the hierarchical NF/LDH@MnO2 nanowires as the positive electrode and activated microwave exfoliated graphite oxide activated graphene as the negative electrode, the fabricated asymmetric supercapacitor produces an energy density of 34.2 Wh kg-1 with a maximum power density of 9 kW kg-1. Such strategies with controllable assembly capability could open up a new and facile avenue in fabricating advanced binder-free energy storage electrodes. This journal is
CitationHao X, Zhang Y, Diao Z, Chen H, Zhang A, et al. (2014) Engineering one-dimensional and two-dimensional birnessite manganese dioxides on nickel foam-supported cobalt–aluminum layered double hydroxides for advanced binder-free supercapacitors. RSC Adv 4: 63901–63908. Available: http://dx.doi.org/10.1039/c4ra12411a.
SponsorsThe authors gratefully acknowledge the financial supports provided by National Natural Science Foundation of China (Grant no. 51104194), Doctoral Fund of Ministry of Education of China (20110191120014), National Key laboratory of Fundamental Science of Micro/Nano-device and System Technology (2013MS06, Chongqing University), State Education Ministry and Fundamental Research Funds for the Central Universities (Project no. CDJZR12135501, and CDJZR13130035, Chongqing University, PR China). The authors acknowledge support on electrochemical characterization by Dr Kexin Yao in King Abdullah University of Science and Technology, Saudi Arabia. Z.W. thanks the financial supports from the National Science Foundation of China under grant no. 11332013, the Grant-in-Aid for Young Scientists (A) (grant no. 24686069), JGC-S Foundation, and Kurata Memorial Hitachi Science and Technology Foundation.
PublisherRoyal Society of Chemistry (RSC)