Cargando…
In-situ growth of MnO(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance
Growing MnO(2) nanocrystals in the bulk of porous carbon nanofibers is conducted in a KMnO(4) aqueous solution aimed to enhance the electrochemical performance of MnO(2). The rate of redox reaction between KMnO(4) and carbon was controlled by the concentration of KMnO(4) in a neutral solution. The M...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5116767/ https://www.ncbi.nlm.nih.gov/pubmed/27869184 http://dx.doi.org/10.1038/srep37368 |
_version_ | 1782468713740500992 |
---|---|
author | Le, TrungHieu Yang, Ying Yu, Liu Huang, Zheng-hong Kang, Feiyu |
author_facet | Le, TrungHieu Yang, Ying Yu, Liu Huang, Zheng-hong Kang, Feiyu |
author_sort | Le, TrungHieu |
collection | PubMed |
description | Growing MnO(2) nanocrystals in the bulk of porous carbon nanofibers is conducted in a KMnO(4) aqueous solution aimed to enhance the electrochemical performance of MnO(2). The rate of redox reaction between KMnO(4) and carbon was controlled by the concentration of KMnO(4) in a neutral solution. The MnO(2) nanoparticles grow along with (211) crystal faces when the redox reaction happens on the surface of fibers under 1D constraint, while the nanoparticles grow along with (200) crystal faces when the redox reaction happens in the bulk of fibers under 3D constraint. The composite, where MnO(2) nanoparticles are formed in the bulk under a constraint, yields an electrode material for supercapacitors showing good electron transport, rapid ion penetration, fast and reversible Faradaic reaction, and excellent rate performance. The capacitance of the composite electrode could be 1282 F g(−1) under a current density of 0.2 A g(−1) in 1 M Na(2)SO(4) electrolyte. A symmetric supercapacitor delivers energy density of 36 Wh kg(−1) with power density of 39 W kg(−1), and can maintain 7.5 Wh kg(−1) at 10.3 kW kg(−1). It exhibits an excellent electrochemical cycling stability with 101% initial capacitance and 95% columbic efficiency even after 1000 cycles of charge/discharge. |
format | Online Article Text |
id | pubmed-5116767 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-51167672016-11-28 In-situ growth of MnO(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance Le, TrungHieu Yang, Ying Yu, Liu Huang, Zheng-hong Kang, Feiyu Sci Rep Article Growing MnO(2) nanocrystals in the bulk of porous carbon nanofibers is conducted in a KMnO(4) aqueous solution aimed to enhance the electrochemical performance of MnO(2). The rate of redox reaction between KMnO(4) and carbon was controlled by the concentration of KMnO(4) in a neutral solution. The MnO(2) nanoparticles grow along with (211) crystal faces when the redox reaction happens on the surface of fibers under 1D constraint, while the nanoparticles grow along with (200) crystal faces when the redox reaction happens in the bulk of fibers under 3D constraint. The composite, where MnO(2) nanoparticles are formed in the bulk under a constraint, yields an electrode material for supercapacitors showing good electron transport, rapid ion penetration, fast and reversible Faradaic reaction, and excellent rate performance. The capacitance of the composite electrode could be 1282 F g(−1) under a current density of 0.2 A g(−1) in 1 M Na(2)SO(4) electrolyte. A symmetric supercapacitor delivers energy density of 36 Wh kg(−1) with power density of 39 W kg(−1), and can maintain 7.5 Wh kg(−1) at 10.3 kW kg(−1). It exhibits an excellent electrochemical cycling stability with 101% initial capacitance and 95% columbic efficiency even after 1000 cycles of charge/discharge. Nature Publishing Group 2016-11-21 /pmc/articles/PMC5116767/ /pubmed/27869184 http://dx.doi.org/10.1038/srep37368 Text en Copyright © 2016, The Author(s) 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 Le, TrungHieu Yang, Ying Yu, Liu Huang, Zheng-hong Kang, Feiyu In-situ growth of MnO(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance |
title | In-situ growth of MnO(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance |
title_full | In-situ growth of MnO(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance |
title_fullStr | In-situ growth of MnO(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance |
title_full_unstemmed | In-situ growth of MnO(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance |
title_short | In-situ growth of MnO(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance |
title_sort | in-situ growth of mno(2) crystals under nanopore-constraint in carbon nanofibers and their electrochemical performance |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5116767/ https://www.ncbi.nlm.nih.gov/pubmed/27869184 http://dx.doi.org/10.1038/srep37368 |
work_keys_str_mv | AT letrunghieu insitugrowthofmno2crystalsundernanoporeconstraintincarbonnanofibersandtheirelectrochemicalperformance AT yangying insitugrowthofmno2crystalsundernanoporeconstraintincarbonnanofibersandtheirelectrochemicalperformance AT yuliu insitugrowthofmno2crystalsundernanoporeconstraintincarbonnanofibersandtheirelectrochemicalperformance AT huangzhenghong insitugrowthofmno2crystalsundernanoporeconstraintincarbonnanofibersandtheirelectrochemicalperformance AT kangfeiyu insitugrowthofmno2crystalsundernanoporeconstraintincarbonnanofibersandtheirelectrochemicalperformance |