Solid State Ionics, volume 306, pages 13-19

Acid-base chemistry and proton conductivity of CsHSO4, CsH2PO4 and their mixtures with N-heterocycles

David Aili ¹

Ying Gao ¹

Junyoung Han ¹

Qingfeng Li ¹

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Department of Energy Conversion and Storage

Publication type: Journal Article

Publication date: 2017-08-01

Elsevier

Journal: Solid State Ionics

Quartile SCImago

Quartile WOS

Impact factor: 3.2

ISSN: 01672738

DOI: 10.1016/j.ssi.2017.03.012

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General Chemistry

Condensed Matter Physics

General Materials Science

Abstract

Caesium hydrogen sulfate (CsHSO 4 ) and caesium dihydrogen phosphate (CsH 2 PO 4 ) are solid acids that undergo superprotonic phase-transitions at about 140 and 230 °C, respectively. As a result, the proton conductivity is increased by several orders of magnitude. However, the practical operational temperature range is narrow due to decomposition of the high-conductivity phases. For CsHSO 4 , it is known that this window can be extended to lower temperatures by addition of carefully selected N -heterocycles. The present work investigates if the same approach can be used to extend the practical operating temperature range of CsH 2 PO 4 as well. Binary mixtures of CsH 2 PO 4 with 1,2,4-triazole, benzimidazole or imidazole were prepared by means of mechanochemical synthesis. Mixtures based on CsHSO 4 were prepared as a basis for a comparative discussion. It was found that CsHSO 4 formed organic-inorganic salts, while CsH 2 PO 4 formed heterogeneous mixtures with the N -heterocycles due to its weaker acidity. At a N -heterocycle content of 30 mol%, enhanced proton conductivity was observed for both solid acids at temperatures below their superprotonic phase transitions.

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Aili D. et al. Acid-base chemistry and proton conductivity of CsHSO4, CsH2PO4 and their mixtures with N-heterocycles // Solid State Ionics. 2017. Vol. 306. pp. 13-19.

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Aili D., Gao Y., Han J., Li Q. Acid-base chemistry and proton conductivity of CsHSO4, CsH2PO4 and their mixtures with N-heterocycles // Solid State Ionics. 2017. Vol. 306. pp. 13-19.

RIS |

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RIS Copy

TY - JOUR

DO - 10.1016/j.ssi.2017.03.012

UR - https://doi.org/10.1016/j.ssi.2017.03.012

TI - Acid-base chemistry and proton conductivity of CsHSO4, CsH2PO4 and their mixtures with N-heterocycles

T2 - Solid State Ionics

AU - Aili, David

AU - Gao, Ying

AU - Han, Junyoung

AU - Li, Qingfeng

PY - 2017

DA - 2017/08/01 00:00:00

PB - Elsevier

SP - 13-19

VL - 306

SN - 0167-2738

ER -

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BibTex Copy

@article{2017_Aili,

author = {David Aili and Ying Gao and Junyoung Han and Qingfeng Li},

title = {Acid-base chemistry and proton conductivity of CsHSO4, CsH2PO4 and their mixtures with N-heterocycles},

journal = {Solid State Ionics},

year = {2017},

volume = {306},

publisher = {Elsevier},

month = {aug},

url = {https://doi.org/10.1016/j.ssi.2017.03.012},

pages = {13--19},

doi = {10.1016/j.ssi.2017.03.012}

}

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Publisher

Elsevier

Journal

Solid State Ionics

Quartile SCImago

Quartile WOS

Impact factor

3.2

ISSN

01672738 (Print)