One‐Pot Synthesis of Tunable Crystalline Ni3S4@Amorphous MoS2 Core/Shell Nanospheres for High‐Performance Supercapacitors |
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Authors: | Yu Zhang Wenping Sun Xianhong Rui Bing Li Hui Teng Tan Guilue Guo Srinivasan Madhavi Yun Zong Qingyu Yan |
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Affiliation: | 1. School of Materials Science and Engineering, Nanyang Technological University, Singapore;2. Energy Research Institute (ERI@N), Interdisciplinary Graduate School, Nanyang Technological University, Singapore;3. Institute of Materials Research and Engineering, A*STAR (Agency for Science Technology and Research), Singapore, Republic of Singapore |
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Abstract: | Transition metal sulfides gain much attention as electrode materials for supercapacitors due to their rich redox chemistry and high electrical conductivity. Designing hierarchical nanostructures is an efficient approach to fully utilize merits of each component. In this work, amorphous MoS2 is firstly demonstrated to show specific capacitance 1.6 times as that of the crystalline counterpart. Then, crystalline core@amorphous shell (Ni3S4@MoS2) is prepared by a facile one‐pot process. The diameter of the core and the thickness of the shell can be independently tuned. Taking advantages of flexible protection of amorphous shell and high capacitance of the conductive core, Ni3S4@amorphous MoS2 nanospheres are tested as supercapacitor electrodes, which exhibit high specific capacitance of 1440.9 F g?1 at 2 A g?1 and a good capacitance retention of 90.7% after 3000 cycles at 10 A g?1. This design of crystalline core@amorphous shell architecture may open up new strategies for synthesizing promising electrode materials for supercapacitors. |
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Keywords: | crystalline core/amorphous shell core/shell structures energy storage Ni3S4@ MoS2 supercapacitors |
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