Synergistic effect of microwave heating and hydrothermal methods on synthesized Ni2CoS4/GO for ultrahigh capacity supercapacitors

Zhen Tang; Shuihua Tang; Qiang Li; Zewei Wei; Tianli Zhou

doi:10.1016/j.jcis.2020.08.042

Synergistic effect of microwave heating and hydrothermal methods on synthesized Ni₂CoS₄/GO for ultrahigh capacity supercapacitors

J Colloid Interface Sci. 2021 Jan 15;582(Pt A):312-321. doi: 10.1016/j.jcis.2020.08.042. Epub 2020 Aug 14.

Authors

Zhen Tang¹, Shuihua Tang², Qiang Li¹, Zewei Wei¹, Tianli Zhou¹

Affiliations

¹ State Key Lab of Oil and Gas Reservoir Geology & Exploitation, Southwest Petroleum University, Chengdu 610500, PR China; School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, PR China.
² State Key Lab of Oil and Gas Reservoir Geology & Exploitation, Southwest Petroleum University, Chengdu 610500, PR China; School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, PR China. Electronic address: spraytang@hotmail.com.

PMID: 32827956
DOI: 10.1016/j.jcis.2020.08.042

Abstract

A simple and efficient strategy that takes advantages of the synergistic effect of microwave heating method and hydrothermal method is used to synthesize Ni₂CoS₄/graphene oxide (MH-Ni₂CoS₄/GO). Firstly, Ni₂CoS₄ nanoparticles are observed to grow uniformly on the surface of GO. Then the obtained MH-Ni₂CoS₄/GO electrode is tested and it demonstrates ultrahigh specific capacitance of 2675.0 F g^-1 at the current densities of 2 A g^-1, fantastic stability of 95.0% even after 2000 cycles at 30 A g^-1 and excellent rate capability of 89.7% with current density increasing from 2 A g^-1 to 30 A g^-1. Moreover, the assembled AC//MH-Ni₂CoS₄/GO asymmetric supercapacitor also delivers a good specific capacitance of 126.5 F g^-1 at 0.5 A g^-1, outstanding stability of 97.0% after 2000 cycles at 5.0 A g^-1, and an ultrahigh energy density of 59.6 Wh kg^-1 at power density of 497.6 W kg^-1. This work provides an approach to synthesize electrode materials with superior excellent performances and it can be easily scaled up for practical applications in supercapacitors.

Keywords: Graphene oxide; Microwave heating-hydrothermal method; Ni(2)CoS(4)/GO; Supercapacitors.