| 초록 |
Transition metal (Mn, Co, Ni-etc.) oxides attract attention in the field of energy storage/conversion not only because of their mechanical, structural, or electronic properties but also their high pseudo capacitance ascribed to their multiple valence state changes. Also they are non–expensive and eco-friendly than noble TMOs such as RuO2, IrO2. Hierarchically mesoporous MnCo2O4 microspheres have been synthesized by urea-assisted co-precipitation method followed by post-annealing treatment. Stoichiometric amount of urea serves as a self-template to favor the self-assembly of hierarchically well-organized, 3D interconnected microspheres under optimized reaction conditions. The electrode of micro/nano-architecture MnCo2O4 delivers the excellent multi-functional electrochemical performance in supercapacitor with high specific capacitance of 1857 F/g at 5mV/s with 97% capacitance retention over 5000 cycles & maintained the optimum current density up to 95 A/g for methanol electro-oxidation. This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF 2016R1D1A1B03930855). |
