Issue 42, 2018, Issue in Progress

Flowery nickel–cobalt hydroxide via a solid–liquid sulphur ion grafting route and its application in hybrid supercapacitive storage

Abstract

In our research, a two-step solid–liquid route was employed to fabricate flowery nickel–cobalt hydroxide with sulphur ion grafting (Ni1Co2–S). The utilization of NaOH/agar and Na2S/agar could efficiently retard the release rates of OH or S2− ions at the solid–liquid interface due to strong bonding between agar hydrogel and these anions. Ni1Co2–S generally displays ultrathin flowery micro-frame, ultrathin internal nanosheets and expanded pore size. Besides, the introduction of suitable sulphide species into nickel–cobalt hydroxide could improve its conductivity due to the lower band gap of Ni–Co sulphide. The supercapacitive electrode Ni1Co2–S presented capacitance of 1317.8 F g−1 (at 1 A g−1) and suitable rate performance (77.9% at 10 A g−1 and 59.3% at 20 A g−1). Furthermore, a hybrid supercapacitor (HSC) was developed utilizing positive Ni1Co2–S and negative activated carbon electrodes. As expected, the HSC device exhibited excellent specific capacitance (117.1 F g−1 at 1 A g−1), considerable energy densities (46.7 W h kg−1 at 0.845 kW kg−1 and 27.5 W h kg−1 even at 9 kW kg−1) and suitable cycling performance, which further illuminated the high energy storage capacity of Ni1Co2–S.

Graphical abstract: Flowery nickel–cobalt hydroxide via a solid–liquid sulphur ion grafting route and its application in hybrid supercapacitive storage

Supplementary files

Article information

Article type
Paper
Submitted
31 Mar 2018
Accepted
06 Jun 2018
First published
29 Jun 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 23817-23824

Flowery nickel–cobalt hydroxide via a solid–liquid sulphur ion grafting route and its application in hybrid supercapacitive storage

L. Ye, Z. Bao, Y. Zhao and L. Zhao, RSC Adv., 2018, 8, 23817 DOI: 10.1039/C8RA02791A

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