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Electrochemistry; capacitance; energy density; ZIF-67; nanomaterial

Here reports a hollow cube NiCo₂S₄ nanomaterial, which was prepared via facile hydroxylation and sulfuration steps using the self-prepared ZIF-67 as a precursor. This kind of NiCo₂S₄ as an electrode material for supercapacitor presents a specific capacitance high up to 1350 F g^-1 at 1 A g^-1 due to the contribution of pseudocapacitance. Particularly, the hybrid supercapacitor PC//NiCo₂S₄, assembled using the NiCo₂S₄ as the positive electrode material and the PC as the negative electrode material, delivers a high energy density of 33 Wh kg^-1 at the power density of 800 W kg^-1. Meanwhile, it presents a good cyclic stability with 67% capacitance retention after 10,000 cycles of charge–discharge at the current density of 5 A g^-1. However, the rate capability is not good enough because of the polarization effect of NiCo₂S₄ as a battery-type electrode material. Therefore, this research provides a reference for enhancing capacitance performance of an electrode material. For instance, reversibility in redox reaction and stability in structure are more important than the capacity in many cases.

XIAOSHAN LI¹ YOU FU¹ HANG MA¹ XILONG LIU² LINA LI¹ JIAN MA¹ CONGJIE LIANG¹ MENG JIN¹ YINGJIE HUA¹ CHONGTAI WANG¹

1. Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, School of Chemistry and Chemical Engineering, Hainan Normal University, Haikou South Longkun Rd., Haikou 571158, People’s Republic of China
2. Chemical college of Jilin University, Changchun 130000, People’s Republic of China

Published

9 August 2020

Manuscript received

6 February 2020

Manuscript revised

15 April 2020

Accepted

15 April 2020