Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors

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...

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Main Authors: Zhang, Chunyan, Cai, Xiaoyi, Qian, Yao, Jiang, Haifeng, Zhou, Lijun, Li, Baosheng, Lai, Linfei, Shen, Zexiang, Huang, Wei
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2018
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Online Access:https://hdl.handle.net/10356/87773
http://hdl.handle.net/10220/45508
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-877732023-02-28T19:35:00Z Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors Zhang, Chunyan Cai, Xiaoyi Qian, Yao Jiang, Haifeng Zhou, Lijun Li, Baosheng Lai, Linfei Shen, Zexiang Huang, Wei School of Physical and Mathematical Sciences Asymmetric Supercapacitors Electrochemical Deposition 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. Published version 2018-08-07T05:49:13Z 2019-12-06T16:49:12Z 2018-08-07T05:49:13Z 2019-12-06T16:49:12Z 2018 Journal Article 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-. https://hdl.handle.net/10356/87773 http://hdl.handle.net/10220/45508 10.1002/advs.201700375 en Advanced Science © 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. 12 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Asymmetric Supercapacitors
Electrochemical Deposition
spellingShingle Asymmetric Supercapacitors
Electrochemical Deposition
Zhang, Chunyan
Cai, Xiaoyi
Qian, Yao
Jiang, Haifeng
Zhou, Lijun
Li, Baosheng
Lai, Linfei
Shen, Zexiang
Huang, Wei
Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors
description 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Zhang, Chunyan
Cai, Xiaoyi
Qian, Yao
Jiang, Haifeng
Zhou, Lijun
Li, Baosheng
Lai, Linfei
Shen, Zexiang
Huang, Wei
format Article
author Zhang, Chunyan
Cai, Xiaoyi
Qian, Yao
Jiang, Haifeng
Zhou, Lijun
Li, Baosheng
Lai, Linfei
Shen, Zexiang
Huang, Wei
author_sort Zhang, Chunyan
title Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors
title_short Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors
title_full Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors
title_fullStr Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors
title_full_unstemmed Electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors
title_sort electrochemically synthesis of nickel cobalt sulfide for high-performance flexible asymmetric supercapacitors
publishDate 2018
url https://hdl.handle.net/10356/87773
http://hdl.handle.net/10220/45508
_version_ 1759856626084347904