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Single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity
When the dimensionality of layered materials is reduced to the physical limit, an ultimate two-dimensional (2D) anisotropy and/or confinement effect may bring about extraordinary physical and chemical properties. Layered double hydroxides (LDHs), bearing abundant hydroxyl groups covalently bonded wi...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5392023/ https://www.ncbi.nlm.nih.gov/pubmed/28439551 http://dx.doi.org/10.1126/sciadv.1602629 |
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author | Sun, Pengzhan Ma, Renzhi Bai, Xueyin Wang, Kunlin Zhu, Hongwei Sasaki, Takayoshi |
author_facet | Sun, Pengzhan Ma, Renzhi Bai, Xueyin Wang, Kunlin Zhu, Hongwei Sasaki, Takayoshi |
author_sort | Sun, Pengzhan |
collection | PubMed |
description | When the dimensionality of layered materials is reduced to the physical limit, an ultimate two-dimensional (2D) anisotropy and/or confinement effect may bring about extraordinary physical and chemical properties. Layered double hydroxides (LDHs), bearing abundant hydroxyl groups covalently bonded within 2D host layers, have been proposed as inorganic anion conductors. However, typical hydroxyl ion conductivities for bulk or lamellar LDHs, generally up to 10(−3) S cm(−1), are considered not high enough for practical applications. We show that single-layer LDH nanosheets exhibited exceptionally high in-plane conductivities approaching 10(−1) S cm(−1), which were the highest among anion conductors and comparable to proton conductivities in commercial proton exchange membranes (for example, Nafion). The in-plane conductivities were four to five orders of magnitude higher than the cross-plane or cross-membrane values of restacked LDH nanosheets. This 2D superionic transport characteristic might have great promises in a variety of applications including alkaline fuel cells and water electrolysis. |
format | Online Article Text |
id | pubmed-5392023 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-53920232017-04-24 Single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity Sun, Pengzhan Ma, Renzhi Bai, Xueyin Wang, Kunlin Zhu, Hongwei Sasaki, Takayoshi Sci Adv Research Articles When the dimensionality of layered materials is reduced to the physical limit, an ultimate two-dimensional (2D) anisotropy and/or confinement effect may bring about extraordinary physical and chemical properties. Layered double hydroxides (LDHs), bearing abundant hydroxyl groups covalently bonded within 2D host layers, have been proposed as inorganic anion conductors. However, typical hydroxyl ion conductivities for bulk or lamellar LDHs, generally up to 10(−3) S cm(−1), are considered not high enough for practical applications. We show that single-layer LDH nanosheets exhibited exceptionally high in-plane conductivities approaching 10(−1) S cm(−1), which were the highest among anion conductors and comparable to proton conductivities in commercial proton exchange membranes (for example, Nafion). The in-plane conductivities were four to five orders of magnitude higher than the cross-plane or cross-membrane values of restacked LDH nanosheets. This 2D superionic transport characteristic might have great promises in a variety of applications including alkaline fuel cells and water electrolysis. American Association for the Advancement of Science 2017-04-14 /pmc/articles/PMC5392023/ /pubmed/28439551 http://dx.doi.org/10.1126/sciadv.1602629 Text en Copyright © 2017, The Authors http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Sun, Pengzhan Ma, Renzhi Bai, Xueyin Wang, Kunlin Zhu, Hongwei Sasaki, Takayoshi Single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity |
title | Single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity |
title_full | Single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity |
title_fullStr | Single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity |
title_full_unstemmed | Single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity |
title_short | Single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity |
title_sort | single-layer nanosheets with exceptionally high and anisotropic hydroxyl ion conductivity |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5392023/ https://www.ncbi.nlm.nih.gov/pubmed/28439551 http://dx.doi.org/10.1126/sciadv.1602629 |
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