Trimetallic Mn-Ni-Co-O@Ni-Mn-S core-shell nanoneedle/nanosheet arrays for supercapacitors

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Abstract To meet the needs of supercapacitors for high-performance electrode materials, a combination of hydrothermal and electrodeposition methods was used to synthesize the transition metal oxide and sulfide composite pseudocapacitance electrode material Mn-Ni-Co-O@Ni-Mn-S (MNCO@NMS) with a unique three-dimensional (3D) core-shell structure nanoneedle/nanosheet core-shell array (3D NDNSA) on nickel foam. The SEM and TEM analysis showed that the one-dimensional MNCO nanoneedle as core and the two-dimensional NMS nanosheet as shell were well interconnected and intertwined to form hierarchical 3D core-shell MNCO@NMS nanostructure. Due to the synergistic effects of transition metal oxides and sulfides and the increased conductivity and active sites resulting from the 3D core-shell structure, the prepared 3D MNCO@NMS exhibited excellent electrochemical properties. In the 3 mol·L^-1 KOH three-electrode electrochemical testing system, the MNCO@NMS electrode processed an excellent capacitance of 2 574.2 F·g^-1 at the current density of 1 A·g^-1; After 5 000 cycles at a current density of 10 A·g^-1, it exhibited a Coulombic efficiency close to 100% and a specific capacitance retention rate of 83.4%. Furthermore, the hybrid supercapacitors (HSCs) with MNCO@NMS as the positive electrode and activated carbon as the negative electrode exhibited a high energy density of 54.4 Wh·kg^-1 at the power density of 799 W·kg^-1; Coulombic efficiency was close to 100% and maintained of 81.7% initial capacitance after 4 000 cycles at 5 A·g^-1. These electrochemical properties indicate that the prepared core-shell MNCO@NMS can be one of the choices for the high-performance electrode of supercapacitors.

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	REN Jianwei
	WANG Yan
	CAI Wangfeng

Keywords： core-shell structure Mn-Ni-Co-O Ni-Mn-S nanosheets supercapacitors

Received 2022-01-05;

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REN Jianwei, WANG Yan, CAI Wangfeng.Trimetallic Mn-Ni-Co-O@Ni-Mn-S core-shell nanoneedle/nanosheet arrays for supercapacitors[J] Chemcial Industry and Engineering, 2022,V39(5): 78-89

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