Insights into the interfacial nanostructuring of NiCo 2 S 4 and their electrochemical activity for ultra-high capacity all-solid-state flexible asymmetric supercapacitors.

Autor: Kumbhar VS; School of Chemical Engineering, Chonnam National University, Gwangju 500-757, South Korea; School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, Sangju, Gyeongbuk, South Korea., Chodankar NR; Department of Energy and Materials Engineering, Dongguk University, Seoul 04620, South Korea., Lee K; School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, Sangju, Gyeongbuk, South Korea., Kim DH; School of Chemical Engineering, Chonnam National University, Gwangju 500-757, South Korea. Electronic address: kdhh@chonnam.ac.kr.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2019 Dec 01; Vol. 557, pp. 423-437. Date of Electronic Publication: 2019 Aug 29.
DOI: 10.1016/j.jcis.2019.08.096
Abstrakt: Ternary metal sulfide based nanostructured materials are promising for commercialization of the electrochemical energy storage devices. Herein, three different NiCo 2 S 4 nanostructures (nanoflakes, nanosheets, and nanoparticles) were fabricated by electrodeposition. Of these, nanosheets consisting of interconnected nanoparticles formed a highly porous network for supercapacitive energy storage. The electrochemical properties of each electrode were studied in detail and it was observed that the self-supported NiCo 2 S 4 nanosheets possess a highest specific capacity of 590 mA h g -1 (2655 F g -1 ) at 0.25 A g -1 current density and cycling stability of 88.7% after 5000 charge-discharge cycles. This excellent behavior is attributed to several factors of the electrode such as high electrochemical active sites and ability of a nanostructure to withstand under high strain and accommodate large number of electrolyte ions during charge-discharge. The electrochemical storage properties of the NiCo 2 S 4 nanosheets were further explored by fabricating battery-like solid-state asymmetric supercapacitor with activated carbon that delivered an ultra-high specific energy and power of 69.7 Wh kg -1 and 8 kW kg -1 , respectively. These outcomes indicate that the novel nanostructured NiCo 2 S 4 network has great potential for the development of energy storage devices.
(Copyright © 2019 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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