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

Research output: Contribution to journalJournal article – Annual report year: 2017Researchpeer-review

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Acid-base chemistry and proton conductivity of CsHSO4, CsH2PO4 and their mixtures with N-heterocycles  . / Aili, David; Gao, Ying; Han, Junyoung; Li, Qingfeng.

In: Solid State Ionics, Vol. 306, 2017, p. 13-19.

Research output: Contribution to journalJournal article – Annual report year: 2017Researchpeer-review

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@article{9d203bdda1fe4cd4a93568669317f0dc,
title = "Acid-base chemistry and proton conductivity of CsHSO4, CsH2PO4 and their mixtures with N-heterocycles  ",
abstract = "Caesium hydrogen sulfate (CsHSO4) and caesium dihydrogen phosphate (CsH2PO4) 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 CsHSO4, 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 CsH2PO4 as well. Binary mixtures of CsH2PO4 with 1,2,4-triazole, benzimidazole or imidazole were prepared by means of mechanochemical synthesis. Mixtures based on CsHSO4 were prepared as a basis for a comparative discussion. It was found that CsHSO4 formed organic-inorganic salts, while CsH2PO4 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.",
keywords = "Solid acid, Caesium dihydrogen phosphate, Composite, Electrolyte, Conductivity",
author = "David Aili and Ying Gao and Junyoung Han and Qingfeng Li",
year = "2017",
doi = "10.1016/j.ssi.2017.03.012",
language = "English",
volume = "306",
pages = "13--19",
journal = "Solid State Ionics",
issn = "0167-2738",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Acid-base chemistry and proton conductivity of CsHSO4, CsH2PO4 and their mixtures with N-heterocycles  

AU - Aili, David

AU - Gao, Ying

AU - Han, Junyoung

AU - Li, Qingfeng

PY - 2017

Y1 - 2017

N2 - Caesium hydrogen sulfate (CsHSO4) and caesium dihydrogen phosphate (CsH2PO4) 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 CsHSO4, 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 CsH2PO4 as well. Binary mixtures of CsH2PO4 with 1,2,4-triazole, benzimidazole or imidazole were prepared by means of mechanochemical synthesis. Mixtures based on CsHSO4 were prepared as a basis for a comparative discussion. It was found that CsHSO4 formed organic-inorganic salts, while CsH2PO4 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.

AB - Caesium hydrogen sulfate (CsHSO4) and caesium dihydrogen phosphate (CsH2PO4) 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 CsHSO4, 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 CsH2PO4 as well. Binary mixtures of CsH2PO4 with 1,2,4-triazole, benzimidazole or imidazole were prepared by means of mechanochemical synthesis. Mixtures based on CsHSO4 were prepared as a basis for a comparative discussion. It was found that CsHSO4 formed organic-inorganic salts, while CsH2PO4 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.

KW - Solid acid

KW - Caesium dihydrogen phosphate

KW - Composite

KW - Electrolyte

KW - Conductivity

U2 - 10.1016/j.ssi.2017.03.012

DO - 10.1016/j.ssi.2017.03.012

M3 - Journal article

VL - 306

SP - 13

EP - 19

JO - Solid State Ionics

JF - Solid State Ionics

SN - 0167-2738

ER -