Ba3-xKxHx(PO4)2: Synthesis and properties of a new class of solid state proton conductors

Calum R I Chisholm; Sossina M. Haile

Ba_3-xK_xH_x(PO₄)₂: Synthesis and properties of a new class of solid state proton conductors

Calum R I Chisholm^*, Sossina M. Haile

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

Abstract

Compounds with the general formula (M⁺¹₃H(XO₄), M = Cs, Rb, NH₄ and X = S, Se undergo superprotonic transitions to trigonal structures with very high protonic conductivity (∼ 10^-2/ω-cm), making them very appealing as solid state electrolytes in fuel cell. These compounds are reduced when used as fuel cell electrolytes. Phosphate analogs exist, with general formula M⁺²³(PO₄)₂), which exhibit nearly identical trigonal structures. Moreover, the superprotonic phosphate CsH₂PO₄ had been stable under fuel cell operational conditions. Compounds with stoichiometry Ba⁺²_3-xK^+1xH_x(PO ₄)₂, x = 0-1, were synthesized to combine the trigonal structure and chemical stablity of Ba₃(PO₄)₂ with the superprotonic conductivity of the M⁺¹₃H(XO₄) compounds. The protonic conductivity of the Ba⁺²_3-xK^+1xH_x(PO ₄)₂ compounds increased by 1000 times compared to that of Ba₃(PO₄). However, the level of conductivity was still 100 times less than that expected for a superprotonic phase due to local order within the structure. This is an abstract of a paper presented at the 229th ACS National Meeting (San Diego, CA 3/13-17/2005).

Original language	English (US)
Pages (from-to)	INOR-451
Journal	ACS National Meeting Book of Abstracts
Volume	229
Issue number	1
State	Published - Aug 3 2005
Event	229th ACS National Meeting - San Diego, CA., United States Duration: Mar 13 2005 → Mar 17 2005

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

Cite this

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title = "Ba3-xKxHx(PO4)2: Synthesis and properties of a new class of solid state proton conductors",

abstract = "Compounds with the general formula (M+13H(XO4), M = Cs, Rb, NH4 and X = S, Se undergo superprotonic transitions to trigonal structures with very high protonic conductivity (∼ 10-2/ω-cm), making them very appealing as solid state electrolytes in fuel cell. These compounds are reduced when used as fuel cell electrolytes. Phosphate analogs exist, with general formula M+23(PO4)2), which exhibit nearly identical trigonal structures. Moreover, the superprotonic phosphate CsH2PO4 had been stable under fuel cell operational conditions. Compounds with stoichiometry Ba+23-xK+1xHx(PO 4)2, x = 0-1, were synthesized to combine the trigonal structure and chemical stablity of Ba3(PO4)2 with the superprotonic conductivity of the M+13H(XO4) compounds. The protonic conductivity of the Ba+23-xK+1xHx(PO 4)2 compounds increased by 1000 times compared to that of Ba3(PO4). However, the level of conductivity was still 100 times less than that expected for a superprotonic phase due to local order within the structure. This is an abstract of a paper presented at the 229th ACS National Meeting (San Diego, CA 3/13-17/2005).",

author = "Chisholm, {Calum R I} and Haile, {Sossina M.}",

year = "2005",

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language = "English (US)",

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N2 - Compounds with the general formula (M+13H(XO4), M = Cs, Rb, NH4 and X = S, Se undergo superprotonic transitions to trigonal structures with very high protonic conductivity (∼ 10-2/ω-cm), making them very appealing as solid state electrolytes in fuel cell. These compounds are reduced when used as fuel cell electrolytes. Phosphate analogs exist, with general formula M+23(PO4)2), which exhibit nearly identical trigonal structures. Moreover, the superprotonic phosphate CsH2PO4 had been stable under fuel cell operational conditions. Compounds with stoichiometry Ba+23-xK+1xHx(PO 4)2, x = 0-1, were synthesized to combine the trigonal structure and chemical stablity of Ba3(PO4)2 with the superprotonic conductivity of the M+13H(XO4) compounds. The protonic conductivity of the Ba+23-xK+1xHx(PO 4)2 compounds increased by 1000 times compared to that of Ba3(PO4). However, the level of conductivity was still 100 times less than that expected for a superprotonic phase due to local order within the structure. This is an abstract of a paper presented at the 229th ACS National Meeting (San Diego, CA 3/13-17/2005).

AB - Compounds with the general formula (M+13H(XO4), M = Cs, Rb, NH4 and X = S, Se undergo superprotonic transitions to trigonal structures with very high protonic conductivity (∼ 10-2/ω-cm), making them very appealing as solid state electrolytes in fuel cell. These compounds are reduced when used as fuel cell electrolytes. Phosphate analogs exist, with general formula M+23(PO4)2), which exhibit nearly identical trigonal structures. Moreover, the superprotonic phosphate CsH2PO4 had been stable under fuel cell operational conditions. Compounds with stoichiometry Ba+23-xK+1xHx(PO 4)2, x = 0-1, were synthesized to combine the trigonal structure and chemical stablity of Ba3(PO4)2 with the superprotonic conductivity of the M+13H(XO4) compounds. The protonic conductivity of the Ba+23-xK+1xHx(PO 4)2 compounds increased by 1000 times compared to that of Ba3(PO4). However, the level of conductivity was still 100 times less than that expected for a superprotonic phase due to local order within the structure. This is an abstract of a paper presented at the 229th ACS National Meeting (San Diego, CA 3/13-17/2005).

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Ba_3-xK_xH_x(PO₄)₂: Synthesis and properties of a new class of solid state proton conductors

Abstract

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