中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 8 August 2023 |
（1. Institute for Advanced Interdisciplinary Research (iAIR), University of Jinan, Jinan 250022, China;
2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China;
3. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China）
Abstract:Hollow MnCoSex/MnO nanospheres wrapped with nitrogen-doped carbon shell (MnCoSex/MnO@N-C) were prepared via a simple solvothermal and selenization strategy followed by the carbon coating procedure. Benefitting from the multiple interfaces coupling between MnCoSex and MnO and unique hollow core-shell architecture, MnCoSex/MnO@N-C composites possess high specific capacitance and superior rate capability, even at a high current density of 5 A/g, the MnCoSex/MnO@N-C can operate steadily for 20000 cycles with 84.6% of initial specific capacitance maintained. An asymmetric supercapacitor device assembled by MnCoSex/MnO@N-C and active carbon depicts a high energy density of 11.2 W·h/kg at a power density of 810 W/kg and a long cycle life with 84.0% of the initial specific capacitance retained after 20000 cycles.
Key words: selenides; hollow nanospheres; nitrogen-doped carbon; cathode; supercapacitor; electrochemical properties
