Proton conductive inorganic materials for temperatures up to 120° C and relative humidity down to 5%

Chunmei Wang, Elena Chalkova, Christopher D. Lute, Mark Valentinovich Fedkin, Sridhar Komarneni, Tze-chiang Chung, Serguei Lvov

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Abstract

The proton conductivities of inorganic conductors in a temperature range of 25-120°C and relative humidity (RH) from 1 to 100% were studied. A conductivity cell was designed and built. A conductivity measurement method was developed including inorganic sample preparation, a reliable condition-controlled experimental system, conductivity measurement protocol, and an electrochemical impedance spectroscopy equivalent circuits. Alpha zirconium phosphate was used as a reference material to test the designed experimental approach based on literature study and laboratory measurements. Solid acid materials, such as sulfated zirconia (S-ZrO2), phosphosilicate gels (P-SiO2), and sulfonic-functionalized silica (SBA-15) were synthesized, characterized, and their conductivities were measured. The impedance characteristics and transport mechanisms were discussed. Under a fully hydrated condition at 120°C, S-ZrO2 presented a proton conductivity of 10 mS cm-1. P-SiO2 was found to be a pure proton conductor. The materials with a P:Si ratio of 1.5 reached a high proton conductivity of 100 mS cm-1, which was higher than that of Nafion at 120°C and 70% RH. In the study, SBA-15 appeared to be a partially electron-conductive material.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume157
Issue number11
DOIs
StatePublished - Oct 13 2010

Fingerprint

inorganic materials
Proton conductivity
Protons
humidity
Atmospheric humidity
conductivity
protons
Conductive materials
Electrochemical impedance spectroscopy
Polysilicon
Zirconium
Equivalent circuits
Silicon Dioxide
Zirconia
Temperature
temperature
Phosphates
Gels
Silica
conductors

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

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title = "Proton conductive inorganic materials for temperatures up to 120° C and relative humidity down to 5{\%}",
abstract = "The proton conductivities of inorganic conductors in a temperature range of 25-120°C and relative humidity (RH) from 1 to 100{\%} were studied. A conductivity cell was designed and built. A conductivity measurement method was developed including inorganic sample preparation, a reliable condition-controlled experimental system, conductivity measurement protocol, and an electrochemical impedance spectroscopy equivalent circuits. Alpha zirconium phosphate was used as a reference material to test the designed experimental approach based on literature study and laboratory measurements. Solid acid materials, such as sulfated zirconia (S-ZrO2), phosphosilicate gels (P-SiO2), and sulfonic-functionalized silica (SBA-15) were synthesized, characterized, and their conductivities were measured. The impedance characteristics and transport mechanisms were discussed. Under a fully hydrated condition at 120°C, S-ZrO2 presented a proton conductivity of 10 mS cm-1. P-SiO2 was found to be a pure proton conductor. The materials with a P:Si ratio of 1.5 reached a high proton conductivity of 100 mS cm-1, which was higher than that of Nafion at 120°C and 70{\%} RH. In the study, SBA-15 appeared to be a partially electron-conductive material.",
author = "Chunmei Wang and Elena Chalkova and Lute, {Christopher D.} and Fedkin, {Mark Valentinovich} and Sridhar Komarneni and Tze-chiang Chung and Serguei Lvov",
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T1 - Proton conductive inorganic materials for temperatures up to 120° C and relative humidity down to 5%

AU - Wang, Chunmei

AU - Chalkova, Elena

AU - Lute, Christopher D.

AU - Fedkin, Mark Valentinovich

AU - Komarneni, Sridhar

AU - Chung, Tze-chiang

AU - Lvov, Serguei

PY - 2010/10/13

Y1 - 2010/10/13

N2 - The proton conductivities of inorganic conductors in a temperature range of 25-120°C and relative humidity (RH) from 1 to 100% were studied. A conductivity cell was designed and built. A conductivity measurement method was developed including inorganic sample preparation, a reliable condition-controlled experimental system, conductivity measurement protocol, and an electrochemical impedance spectroscopy equivalent circuits. Alpha zirconium phosphate was used as a reference material to test the designed experimental approach based on literature study and laboratory measurements. Solid acid materials, such as sulfated zirconia (S-ZrO2), phosphosilicate gels (P-SiO2), and sulfonic-functionalized silica (SBA-15) were synthesized, characterized, and their conductivities were measured. The impedance characteristics and transport mechanisms were discussed. Under a fully hydrated condition at 120°C, S-ZrO2 presented a proton conductivity of 10 mS cm-1. P-SiO2 was found to be a pure proton conductor. The materials with a P:Si ratio of 1.5 reached a high proton conductivity of 100 mS cm-1, which was higher than that of Nafion at 120°C and 70% RH. In the study, SBA-15 appeared to be a partially electron-conductive material.

AB - The proton conductivities of inorganic conductors in a temperature range of 25-120°C and relative humidity (RH) from 1 to 100% were studied. A conductivity cell was designed and built. A conductivity measurement method was developed including inorganic sample preparation, a reliable condition-controlled experimental system, conductivity measurement protocol, and an electrochemical impedance spectroscopy equivalent circuits. Alpha zirconium phosphate was used as a reference material to test the designed experimental approach based on literature study and laboratory measurements. Solid acid materials, such as sulfated zirconia (S-ZrO2), phosphosilicate gels (P-SiO2), and sulfonic-functionalized silica (SBA-15) were synthesized, characterized, and their conductivities were measured. The impedance characteristics and transport mechanisms were discussed. Under a fully hydrated condition at 120°C, S-ZrO2 presented a proton conductivity of 10 mS cm-1. P-SiO2 was found to be a pure proton conductor. The materials with a P:Si ratio of 1.5 reached a high proton conductivity of 100 mS cm-1, which was higher than that of Nafion at 120°C and 70% RH. In the study, SBA-15 appeared to be a partially electron-conductive material.

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