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Transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density

Fiber shaped supercapacitors are promising candidates for wearable electronics because they are flexible and light-weight. However, a critical challenge of the widespread application of these energy storage devices is their low cell voltages and low energy densities, resulting in limited run-time of...

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Autores principales: Cai, Weihua, Lai, Ting, Lai, Jianwei, Xie, Haoting, Ouyang, Liuzhang, Ye, Jianshan, Yu, Chengzhong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4888745/
https://www.ncbi.nlm.nih.gov/pubmed/27248510
http://dx.doi.org/10.1038/srep26890
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author Cai, Weihua
Lai, Ting
Lai, Jianwei
Xie, Haoting
Ouyang, Liuzhang
Ye, Jianshan
Yu, Chengzhong
author_facet Cai, Weihua
Lai, Ting
Lai, Jianwei
Xie, Haoting
Ouyang, Liuzhang
Ye, Jianshan
Yu, Chengzhong
author_sort Cai, Weihua
collection PubMed
description Fiber shaped supercapacitors are promising candidates for wearable electronics because they are flexible and light-weight. However, a critical challenge of the widespread application of these energy storage devices is their low cell voltages and low energy densities, resulting in limited run-time of the electronics. Here, we demonstrate a 1.5 V high cell voltage and high volumetric energy density asymmetric fiber supercapacitor in aqueous electrolyte. The lightweight (0.24 g cm(−3)), highly conductive (39 S cm(−1)), and mechanically robust (221 MPa) graphene fibers were firstly fabricated and then coated by NiCo(2)S(4) nanoparticles (GF/NiCo(2)S(4)) via the solvothermal deposition method. The GF/NiCo(2)S(4) display high volumetric capacitance up to 388 F cm(−3) at 2 mV s(−1) in a three-electrode cell and 300 F cm(−3) at 175.7 mA cm(−3) (568 mF cm(−2) at 0.5 mA cm(−2)) in a two-electrode cell. The electrochemical characterizations show 1000% higher capacitance of the GF/NiCo(2)S(4) as compared to that of neat graphene fibers. The fabricated device achieves high energy density up to 12.3 mWh cm(−3) with a maximum power density of 1600 mW cm(−3), outperforming the thin-film lithium battery. Therefore, these supercapacitors are promising for the next generation flexible and wearable electronic devices.
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spelling pubmed-48887452016-06-09 Transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density Cai, Weihua Lai, Ting Lai, Jianwei Xie, Haoting Ouyang, Liuzhang Ye, Jianshan Yu, Chengzhong Sci Rep Article Fiber shaped supercapacitors are promising candidates for wearable electronics because they are flexible and light-weight. However, a critical challenge of the widespread application of these energy storage devices is their low cell voltages and low energy densities, resulting in limited run-time of the electronics. Here, we demonstrate a 1.5 V high cell voltage and high volumetric energy density asymmetric fiber supercapacitor in aqueous electrolyte. The lightweight (0.24 g cm(−3)), highly conductive (39 S cm(−1)), and mechanically robust (221 MPa) graphene fibers were firstly fabricated and then coated by NiCo(2)S(4) nanoparticles (GF/NiCo(2)S(4)) via the solvothermal deposition method. The GF/NiCo(2)S(4) display high volumetric capacitance up to 388 F cm(−3) at 2 mV s(−1) in a three-electrode cell and 300 F cm(−3) at 175.7 mA cm(−3) (568 mF cm(−2) at 0.5 mA cm(−2)) in a two-electrode cell. The electrochemical characterizations show 1000% higher capacitance of the GF/NiCo(2)S(4) as compared to that of neat graphene fibers. The fabricated device achieves high energy density up to 12.3 mWh cm(−3) with a maximum power density of 1600 mW cm(−3), outperforming the thin-film lithium battery. Therefore, these supercapacitors are promising for the next generation flexible and wearable electronic devices. Nature Publishing Group 2016-06-01 /pmc/articles/PMC4888745/ /pubmed/27248510 http://dx.doi.org/10.1038/srep26890 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Cai, Weihua
Lai, Ting
Lai, Jianwei
Xie, Haoting
Ouyang, Liuzhang
Ye, Jianshan
Yu, Chengzhong
Transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density
title Transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density
title_full Transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density
title_fullStr Transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density
title_full_unstemmed Transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density
title_short Transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density
title_sort transition metal sulfides grown on graphene fibers for wearable asymmetric supercapacitors with high volumetric capacitance and high energy density
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4888745/
https://www.ncbi.nlm.nih.gov/pubmed/27248510
http://dx.doi.org/10.1038/srep26890
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