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Ice-templated Self-assembly of VOPO(4)–Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes
A simple ice-templated self-assembly process is used to prepare a three-dimensional (3D) and vertically porous nanocomposite of layered vanadium phosphates (VOPO(4)) and graphene nanosheets with high surface area and high electrical conductivity. The resulting 3D VOPO(4)–graphene nanocomposite has a...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4558581/ https://www.ncbi.nlm.nih.gov/pubmed/26333591 http://dx.doi.org/10.1038/srep13696 |
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author | Lee, Kwang Hoon Lee, Young-Woo Lee, Seung Woo Ha, Jeong Sook Lee, Sang-Soo Son, Jeong Gon |
author_facet | Lee, Kwang Hoon Lee, Young-Woo Lee, Seung Woo Ha, Jeong Sook Lee, Sang-Soo Son, Jeong Gon |
author_sort | Lee, Kwang Hoon |
collection | PubMed |
description | A simple ice-templated self-assembly process is used to prepare a three-dimensional (3D) and vertically porous nanocomposite of layered vanadium phosphates (VOPO(4)) and graphene nanosheets with high surface area and high electrical conductivity. The resulting 3D VOPO(4)–graphene nanocomposite has a much higher capacitance of 527.9 F g(−1) at a current density of 0.5 A g(−1), compared with ~247 F g(−1) of simple 3D VOPO(4), with solid cycling stability. The enhanced pseudocapacitive behavior mainly originates from vertically porous structures from directionally grown ice crystals and simultaneously inducing radial segregation and forming inter-stacked structures of VOPO(4)–graphene nanosheets. This VOPO(4)–graphene nanocomposite electrode exhibits high surface area, vertically porous structure to the separator, structural stability from interstacked structure and high electrical conductivity, which would provide the short diffusion paths of electrolyte ions and fast transportation of charges within the conductive frameworks. In addition, an asymmetric supercapacitor (ASC) is fabricated by using vertically porous VOPO(4)–graphene as the positive electrode and vertically porous 3D graphene as the negative electrode; it exhibits a wide cell voltage of 1.6 V and a largely enhanced energy density of 108 Wh kg(−1). |
format | Online Article Text |
id | pubmed-4558581 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-45585812015-09-11 Ice-templated Self-assembly of VOPO(4)–Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes Lee, Kwang Hoon Lee, Young-Woo Lee, Seung Woo Ha, Jeong Sook Lee, Sang-Soo Son, Jeong Gon Sci Rep Article A simple ice-templated self-assembly process is used to prepare a three-dimensional (3D) and vertically porous nanocomposite of layered vanadium phosphates (VOPO(4)) and graphene nanosheets with high surface area and high electrical conductivity. The resulting 3D VOPO(4)–graphene nanocomposite has a much higher capacitance of 527.9 F g(−1) at a current density of 0.5 A g(−1), compared with ~247 F g(−1) of simple 3D VOPO(4), with solid cycling stability. The enhanced pseudocapacitive behavior mainly originates from vertically porous structures from directionally grown ice crystals and simultaneously inducing radial segregation and forming inter-stacked structures of VOPO(4)–graphene nanosheets. This VOPO(4)–graphene nanocomposite electrode exhibits high surface area, vertically porous structure to the separator, structural stability from interstacked structure and high electrical conductivity, which would provide the short diffusion paths of electrolyte ions and fast transportation of charges within the conductive frameworks. In addition, an asymmetric supercapacitor (ASC) is fabricated by using vertically porous VOPO(4)–graphene as the positive electrode and vertically porous 3D graphene as the negative electrode; it exhibits a wide cell voltage of 1.6 V and a largely enhanced energy density of 108 Wh kg(−1). Nature Publishing Group 2015-09-03 /pmc/articles/PMC4558581/ /pubmed/26333591 http://dx.doi.org/10.1038/srep13696 Text en Copyright © 2015, 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 Lee, Kwang Hoon Lee, Young-Woo Lee, Seung Woo Ha, Jeong Sook Lee, Sang-Soo Son, Jeong Gon Ice-templated Self-assembly of VOPO(4)–Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes |
title | Ice-templated Self-assembly of VOPO(4)–Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes |
title_full | Ice-templated Self-assembly of VOPO(4)–Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes |
title_fullStr | Ice-templated Self-assembly of VOPO(4)–Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes |
title_full_unstemmed | Ice-templated Self-assembly of VOPO(4)–Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes |
title_short | Ice-templated Self-assembly of VOPO(4)–Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes |
title_sort | ice-templated self-assembly of vopo(4)–graphene nanocomposites for vertically porous 3d supercapacitor electrodes |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4558581/ https://www.ncbi.nlm.nih.gov/pubmed/26333591 http://dx.doi.org/10.1038/srep13696 |
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