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Title: Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors
Authors: Zhang, Chunyan
Cai, Xiaoyi
Qian, Yao
Jiang, Haifeng
Zhou, Lijun
Li, Baosheng
Lai, Linfei
Shen, Zexiang
Huang, Wei
Keywords: Asymmetric Supercapacitors
Electrochemical Deposition
Issue Date: 2018
Source: Zhang, C., Cai, X., Qian, Y., Jiang, H., Zhou, L., Li, B., et al. (2018). Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors. Advanced Science, 5(2), 1700375-.
Series/Report no.: Advanced Science
Abstract: A lightweight, flexible, and highly efficient energy management strategy is highly desirable for flexible electronic devices to meet a rapidly growing demand. Herein, Ni–Co–S nanosheet array is successfully deposited on graphene foam (Ni–Co–S/GF) by a one‐step electrochemical method. The Ni–Co–S/GF composed of Ni–Co–S nanosheet array which is vertically aligned to GF and provides a large interfacial area for redox reactions with optimum interstitials facilitates the ions diffusion. The Ni–Co–S/GF electrodes have high specific capacitance values of 2918 and 2364 F g−1 at current densities of 1 and 20 A g−1, respectively. Using such hierarchical Ni–Co–S/GF as the cathode, a flexible asymmetric supercapacitor (ASC) is further fabricated with polypyrrple(PPy)/GF as the anode. The flexible asymmetric supercapacitors have maximum operation potential window of 1.65 V, and energy densities of 79.3 and 37.7 Wh kg−1 when the power densities are 825.0 and 16100 W kg−1, respectively. It's worth nothing that the ASC cells have robust flexibility with performance well maintained when the devices were bent to different angles from 180° to 15° at a duration of 5 min. The efficient electrochemical deposition method of Ni–Co–S with a preferred orientation of nanosheet arrays is applicable for the flexible energy storage devices.
DOI: 10.1002/advs.201700375
Rights: © 2017 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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