Vapor pressure and specific electrical conductivity in the solid and molten H2O-CsH2PO4-CsPO3 system—a novel electrolyte for water electrolysis at ~ 225–400 °C

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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Vapor pressure and specific electrical conductivity in the solid and molten H2O-CsH2PO4-CsPO3 system—a novel electrolyte for water electrolysis at ~ 225–400 °C. / Nikiforov, Aleksey Valerievich; Berg, Rolf W.; Bjerrum, Niels J.

In: Ionics, Vol. 24, No. 9, 2018, p. 2761-2782.

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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@article{0c9b2a48df7b458db7d99b2c62325c33,
title = "Vapor pressure and specific electrical conductivity in the solid and molten H2O-CsH2PO4-CsPO3 system—a novel electrolyte for water electrolysis at ~ 225–400 °C",
abstract = "Cesium dihydrogen phosphate, CsH2PO4 (CDP) was studied for water electrolysis at ~ 225–400 °C. In the presence of sufficient humidity, CDP is structurally disordered and super-protonic conducting with conductivities reaching 0.2–0.25 S cm−1, when determined in suitable H-shaped sealed conductivity cells. Freshly prepared 99.7 ± 0.3{\%} gravimetric pure CDP with correct X-ray diffraction and DSC diagram melted at ~ 345 °C. The vapor pressures, above CDP alone and mixed with 20–50 mol{\%} CsPO3 or 13 mol{\%} H2O, were determined in sealed ampoules up to 355 °C by means of Raman spectroscopy based on internal reference gases. Pressures up to ~ 49 bar were estimated, much higher than previously expected. Conductivities were given as polynomials and plotted in solid and liquid states. Water splitting electrolysis 2H2O → 2H2 + O2 was demonstrated by Raman at ~ 355 °C under a water pressure of ~ 23 bar in a quartz cell with platinum electrodes, showing molten CDP to have significant potential for water electrolysis.",
keywords = "CDP, Ionic conductivity, H + conductor, Phosphate-based electrolyte, Elevated temperature pressure electrolysis",
author = "Nikiforov, {Aleksey Valerievich} and Berg, {Rolf W.} and Bjerrum, {Niels J.}",
year = "2018",
doi = "10.1007/s11581-017-2420-3",
language = "English",
volume = "24",
pages = "2761--2782",
journal = "Ionics",
issn = "0947-7047",
publisher = "Springer",
number = "9",

}

RIS

TY - JOUR

T1 - Vapor pressure and specific electrical conductivity in the solid and molten H2O-CsH2PO4-CsPO3 system—a novel electrolyte for water electrolysis at ~ 225–400 °C

AU - Nikiforov, Aleksey Valerievich

AU - Berg, Rolf W.

AU - Bjerrum, Niels J.

PY - 2018

Y1 - 2018

N2 - Cesium dihydrogen phosphate, CsH2PO4 (CDP) was studied for water electrolysis at ~ 225–400 °C. In the presence of sufficient humidity, CDP is structurally disordered and super-protonic conducting with conductivities reaching 0.2–0.25 S cm−1, when determined in suitable H-shaped sealed conductivity cells. Freshly prepared 99.7 ± 0.3% gravimetric pure CDP with correct X-ray diffraction and DSC diagram melted at ~ 345 °C. The vapor pressures, above CDP alone and mixed with 20–50 mol% CsPO3 or 13 mol% H2O, were determined in sealed ampoules up to 355 °C by means of Raman spectroscopy based on internal reference gases. Pressures up to ~ 49 bar were estimated, much higher than previously expected. Conductivities were given as polynomials and plotted in solid and liquid states. Water splitting electrolysis 2H2O → 2H2 + O2 was demonstrated by Raman at ~ 355 °C under a water pressure of ~ 23 bar in a quartz cell with platinum electrodes, showing molten CDP to have significant potential for water electrolysis.

AB - Cesium dihydrogen phosphate, CsH2PO4 (CDP) was studied for water electrolysis at ~ 225–400 °C. In the presence of sufficient humidity, CDP is structurally disordered and super-protonic conducting with conductivities reaching 0.2–0.25 S cm−1, when determined in suitable H-shaped sealed conductivity cells. Freshly prepared 99.7 ± 0.3% gravimetric pure CDP with correct X-ray diffraction and DSC diagram melted at ~ 345 °C. The vapor pressures, above CDP alone and mixed with 20–50 mol% CsPO3 or 13 mol% H2O, were determined in sealed ampoules up to 355 °C by means of Raman spectroscopy based on internal reference gases. Pressures up to ~ 49 bar were estimated, much higher than previously expected. Conductivities were given as polynomials and plotted in solid and liquid states. Water splitting electrolysis 2H2O → 2H2 + O2 was demonstrated by Raman at ~ 355 °C under a water pressure of ~ 23 bar in a quartz cell with platinum electrodes, showing molten CDP to have significant potential for water electrolysis.

KW - CDP

KW - Ionic conductivity

KW - H + conductor

KW - Phosphate-based electrolyte

KW - Elevated temperature pressure electrolysis

U2 - 10.1007/s11581-017-2420-3

DO - 10.1007/s11581-017-2420-3

M3 - Journal article

VL - 24

SP - 2761

EP - 2782

JO - Ionics

JF - Ionics

SN - 0947-7047

IS - 9

ER -