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Biotemplating pores with size and shape diversity for Li-oxygen Battery Cathodes

Synthetic porogens provide an easy way to create porous structures, but their usage is limited due to synthetic difficulties, process complexities and prohibitive costs. Here we investigate the use of bacteria, sustainable and naturally abundant materials, as a pore template. The bacteria require no...

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Autores principales: Oh, Dahyun, Ozgit-Akgun, Çagla, Akca, Esin, Thompson, Leslie E., Tadesse, Loza F., Kim, Ho-Cheol, Demirci, Gökhan, Miller, Robert D., Maune, Hareem
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5379672/
https://www.ncbi.nlm.nih.gov/pubmed/28374862
http://dx.doi.org/10.1038/srep45919
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author Oh, Dahyun
Ozgit-Akgun, Çagla
Akca, Esin
Thompson, Leslie E.
Tadesse, Loza F.
Kim, Ho-Cheol
Demirci, Gökhan
Miller, Robert D.
Maune, Hareem
author_facet Oh, Dahyun
Ozgit-Akgun, Çagla
Akca, Esin
Thompson, Leslie E.
Tadesse, Loza F.
Kim, Ho-Cheol
Demirci, Gökhan
Miller, Robert D.
Maune, Hareem
author_sort Oh, Dahyun
collection PubMed
description Synthetic porogens provide an easy way to create porous structures, but their usage is limited due to synthetic difficulties, process complexities and prohibitive costs. Here we investigate the use of bacteria, sustainable and naturally abundant materials, as a pore template. The bacteria require no chemical synthesis, come in variable sizes and shapes, degrade easier and are approximately a million times cheaper than conventional porogens. We fabricate free standing porous multiwalled carbon nanotube (MWCNT) films using cultured, harmless bacteria as porogens, and demonstrate substantial Li-oxygen battery performance improvement by porosity control. Pore volume as well as shape in the cathodes were easily tuned to improve oxygen evolution efficiency by 30% and double the full discharge capacity in repeated cycles compared to the compact MWCNT electrode films. The interconnected pores produced by the templates greatly improve the accessibility of reactants allowing the achievement of 4,942 W/kg (8,649 Wh/kg) at 2 A/g(e) (1.7 mA/cm(2)).
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spelling pubmed-53796722017-04-07 Biotemplating pores with size and shape diversity for Li-oxygen Battery Cathodes Oh, Dahyun Ozgit-Akgun, Çagla Akca, Esin Thompson, Leslie E. Tadesse, Loza F. Kim, Ho-Cheol Demirci, Gökhan Miller, Robert D. Maune, Hareem Sci Rep Article Synthetic porogens provide an easy way to create porous structures, but their usage is limited due to synthetic difficulties, process complexities and prohibitive costs. Here we investigate the use of bacteria, sustainable and naturally abundant materials, as a pore template. The bacteria require no chemical synthesis, come in variable sizes and shapes, degrade easier and are approximately a million times cheaper than conventional porogens. We fabricate free standing porous multiwalled carbon nanotube (MWCNT) films using cultured, harmless bacteria as porogens, and demonstrate substantial Li-oxygen battery performance improvement by porosity control. Pore volume as well as shape in the cathodes were easily tuned to improve oxygen evolution efficiency by 30% and double the full discharge capacity in repeated cycles compared to the compact MWCNT electrode films. The interconnected pores produced by the templates greatly improve the accessibility of reactants allowing the achievement of 4,942 W/kg (8,649 Wh/kg) at 2 A/g(e) (1.7 mA/cm(2)). Nature Publishing Group 2017-04-04 /pmc/articles/PMC5379672/ /pubmed/28374862 http://dx.doi.org/10.1038/srep45919 Text en Copyright © 2017, 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
Oh, Dahyun
Ozgit-Akgun, Çagla
Akca, Esin
Thompson, Leslie E.
Tadesse, Loza F.
Kim, Ho-Cheol
Demirci, Gökhan
Miller, Robert D.
Maune, Hareem
Biotemplating pores with size and shape diversity for Li-oxygen Battery Cathodes
title Biotemplating pores with size and shape diversity for Li-oxygen Battery Cathodes
title_full Biotemplating pores with size and shape diversity for Li-oxygen Battery Cathodes
title_fullStr Biotemplating pores with size and shape diversity for Li-oxygen Battery Cathodes
title_full_unstemmed Biotemplating pores with size and shape diversity for Li-oxygen Battery Cathodes
title_short Biotemplating pores with size and shape diversity for Li-oxygen Battery Cathodes
title_sort biotemplating pores with size and shape diversity for li-oxygen battery cathodes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5379672/
https://www.ncbi.nlm.nih.gov/pubmed/28374862
http://dx.doi.org/10.1038/srep45919
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