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Graphene-Co(3)O(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction

Graphene-Co(3)O(4) composite with a unique sandwich-architecture was successfully synthesized and applied as an efficient electrocatalyst for oxygen evolution reaction. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses confirmed that Co(3)O(4) na...

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Autores principales: Zhao, Yufei, Chen, Shuangqiang, Sun, Bing, Su, Dawei, Huang, Xiaodan, Liu, Hao, Yan, Yiming, Sun, Kening, Wang, Guoxiu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284504/
https://www.ncbi.nlm.nih.gov/pubmed/25559459
http://dx.doi.org/10.1038/srep07629
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author Zhao, Yufei
Chen, Shuangqiang
Sun, Bing
Su, Dawei
Huang, Xiaodan
Liu, Hao
Yan, Yiming
Sun, Kening
Wang, Guoxiu
author_facet Zhao, Yufei
Chen, Shuangqiang
Sun, Bing
Su, Dawei
Huang, Xiaodan
Liu, Hao
Yan, Yiming
Sun, Kening
Wang, Guoxiu
author_sort Zhao, Yufei
collection PubMed
description Graphene-Co(3)O(4) composite with a unique sandwich-architecture was successfully synthesized and applied as an efficient electrocatalyst for oxygen evolution reaction. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses confirmed that Co(3)O(4) nanocrystals were homogeneously distributed on both sides of graphene nanosheets. The obtained composite shows enhanced catalytic activities in both alkaline and neutral electrolytes. The onset potential towards the oxygen evolution reaction is 0.406 V (vs. Ag/AgCl) in 1 M KOH solution, and 0.858 V (vs. Ag/AgCl) in neutral phosphate buffer solution (PBS), respectively. The current density of 10 mA/cm(2) has been achieved at the overpotential of 313 mV in 1 M KOH and 498 mV in PBS. The graphene-Co(3)O(4) composite also exhibited an excellent stability in both alkaline and neutral electrolytes. In particular, no obvious current density decay was observed after 10 hours testing in alkaline solution and the morphology of the material was well maintained, which could be ascribed to the synergistic effect of combining Co(3)O(4) and graphene.
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spelling pubmed-42845042015-01-09 Graphene-Co(3)O(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction Zhao, Yufei Chen, Shuangqiang Sun, Bing Su, Dawei Huang, Xiaodan Liu, Hao Yan, Yiming Sun, Kening Wang, Guoxiu Sci Rep Article Graphene-Co(3)O(4) composite with a unique sandwich-architecture was successfully synthesized and applied as an efficient electrocatalyst for oxygen evolution reaction. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses confirmed that Co(3)O(4) nanocrystals were homogeneously distributed on both sides of graphene nanosheets. The obtained composite shows enhanced catalytic activities in both alkaline and neutral electrolytes. The onset potential towards the oxygen evolution reaction is 0.406 V (vs. Ag/AgCl) in 1 M KOH solution, and 0.858 V (vs. Ag/AgCl) in neutral phosphate buffer solution (PBS), respectively. The current density of 10 mA/cm(2) has been achieved at the overpotential of 313 mV in 1 M KOH and 498 mV in PBS. The graphene-Co(3)O(4) composite also exhibited an excellent stability in both alkaline and neutral electrolytes. In particular, no obvious current density decay was observed after 10 hours testing in alkaline solution and the morphology of the material was well maintained, which could be ascribed to the synergistic effect of combining Co(3)O(4) and graphene. Nature Publishing Group 2015-01-06 /pmc/articles/PMC4284504/ /pubmed/25559459 http://dx.doi.org/10.1038/srep07629 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-sa/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 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 in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/
spellingShingle Article
Zhao, Yufei
Chen, Shuangqiang
Sun, Bing
Su, Dawei
Huang, Xiaodan
Liu, Hao
Yan, Yiming
Sun, Kening
Wang, Guoxiu
Graphene-Co(3)O(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction
title Graphene-Co(3)O(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction
title_full Graphene-Co(3)O(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction
title_fullStr Graphene-Co(3)O(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction
title_full_unstemmed Graphene-Co(3)O(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction
title_short Graphene-Co(3)O(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction
title_sort graphene-co(3)o(4) nanocomposite as electrocatalyst with high performance for oxygen evolution reaction
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284504/
https://www.ncbi.nlm.nih.gov/pubmed/25559459
http://dx.doi.org/10.1038/srep07629
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