NiCo2O4 nanowire-supported NiCoMnS4 nanosheets on carbon cloth as a flexible cathode for high-performance aqueous supercapacitors. (1st December 2021)

• Record Type: Journal Article
• Authors: Yang, Mingzhe; Wang, Xiao; Chen, Yue; Du, Yihe; Zou, Situo; Emin, Adil; Song, Xiaoqiang; Fu, Yujun; Li, Yali; Li, Junshuai; He, Deyan
• Is Part Of: Electrochimica acta. Volume 398(2021)
• Publication Date: 2021-12-01
• Subjects: Aqueous asymmetric supercapacitors -- High energy density -- Transition metal sulfides/oxides -- Self-supported flexible electrodes; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2021.139324
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: A high-performance self-supporting flexible cathode of NiCo2 O4 @NiCoMnS4 on CC is developed. 4836.2 mF cm –2 at 1 mA cm –2, and excellent rate and cycle performance are delivered. The 1.7 V aqueous asymmetric supercapacitors deliver 0.399 mWh cm –2 at 0.85 mW cm –2 and good cycle performance. Abstract: In this paper, we report a self-supported flexible electrode consisting of NiCoMnS4 nanosheets on NiCo2 O4 nanowires, denoted as NiCo2 O4 @NiCoMnS4 (NCO@NCMS) prepared by the hydrothermal growth (NiCo2 O4 ) and the following electrodeposition (NiCoMnS4 ) on a carbon cloth (CC) substrate. The electrode delivers a high specific capacity of 4836 mF cm –2 at 1 mA cm –2 and excellent rate performance, i.e., 3820 mF cm –2 at 10 mA cm –2 and 2820 mF cm –2 even at 60 mA cm –2 . An aqueous asymmetric supercapacitor (AASC) assembled using NCO@NCMS on CC as the cathode, activated carbon on CC as the anode and 2 M KOH as the electrolyte delivers a high energy density of 0.399 mWh cm –2 at 0.85 mW cm –2 and excellent cycle stability with ∼81.2% capacity retention after 20000 cycles at a high current density of 20 mA cm –2 . In view of the excellent performance and facile preparation, this study is believed to provide a valuable exploration of developing high-performance electrodes and AASCs.