Rational design of hierarchically porous birnessite-type manganese dioxides nanosheets on different one-dimensional titania-based nanowires for high performance supercapacitors
AuthorsZhang, Yu Xin
Hao, Xiao Dong
Guo, Xiao Long
Han, Gen Quan
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AbstractA facile and large-scale strategy of mesoporous birnessite-type manganese dioxide (MnO2) nanosheets on one-dimension (1D) H2Ti 3O7 and anatase/TiO2 (B) nanowires (NWs) is developed for high performance supercapacitors. The morphological characteristics of MnO2 nanoflakes on H2Ti 3O7 and anatase/TiO2 (B) NWs could be rationally designed with various characteristics (e.g., the sheet thickness, surface area). Interestingly, the MnO2/TiO2 NWs exhibit a more optimized electrochemical performance with specific capacitance of 120 F g-1 at current density of 0.1 A g-1 (based on MnO 2 + TiO2) than MnO2/H2Ti 3O7 NWs. An asymmetric supercapacitor of MnO 2/TiO2//activated graphene (AG) yields a better energy density of 29.8 Wh kg-1 than MnO2/H2Ti 3O7//AG asymmetric supercapacitor, while maintaining desirable cycling stability. Indeed, the pseudocapacitive difference is related to the substrates, unique structure and surface area. Especially, the anatase/TiO2 (B) mixed-phase system can provide good electronic conductivity and high utilization of MnO2 nanosheets. © 2014 Elsevier B.V. All rights reserved.
CitationZhang YX, Kuang M, Hao XD, Liu Y, Huang M, et al. (2014) Rational design of hierarchically porous birnessite-type manganese dioxides nanosheets on different one-dimensional titania-based nanowires for high performance supercapacitors. Journal of Power Sources 270: 675–683. Available: http://dx.doi.org/10.1016/j.jpowsour.2014.07.114.
SponsorsThe authors gratefully acknowledge the financial supports provided by National Natural Science Foundation of China (Grant no. 51104194 and 21103127), Doctoral Fund of Ministry of Education of China (20110191120014), No. 43 Scientific Research Foundation for the Returned Overseas Chinese Scholars, 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. 106112013CDJZR120017 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.
JournalJournal of Power Sources