Effects of tin phosphate nanosheet addition on proton-conducting properties of sulfonated poly(ether sulfone) membranes

Shoichi Sugata; Shinya Suzuki; Masaru Miyayama; Enrico Traversa; Silvia Licoccia

doi:10.1016/j.ssi.2012.08.024

Effects of tin phosphate nanosheet addition on proton-conducting properties of sulfonated poly(ether sulfone) membranes

Shoichi Sugata^*, Shinya Suzuki, Masaru Miyayama, Enrico Traversa, Silvia Licoccia

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Organic/inorganic composite membranes were prepared by dispersing nanosheets of layered tin phosphate hydrate [Sn(HPO₄) ₂·nH₂O (SnP)] in sulfonated poly(ether sulfone) (SPES) at SnP contents of 0-40 vol.%. The stabilities and proton conductivities of SPES/SnP nanosheet (SnP-NS) composite membranes were investigated and compared with those of SPES/SnP particle (SnP-P) composite membranes. The chemical stabilities as evaluated by thermogravimetry, differential thermal analysis, and diffuse reflectance Fourier-transform infrared spectroscopy were improved in both composite membranes. The improvement in the structural stability of SPES/SnP-NS composite membranes was more evident than that in SPES/SnP-P. The results suggest that exfoliation of SnP increases the area of the SPES-SnP interface and extends the connectivity of the network of hydrogen bonds. A composite membrane containing 10 vol.% SnP-NS (SPES/SnP-NS10vol.%) showed a high conductivity of 5.9 × 10^{- 2} S cm^{- 1} at 150 °C under saturated water vapor pressure. Although less water was present in SPES/SnP-NS10vol.% than in SPES/SnP-P10vol.% or pure SPES, the conductivity of SnP-NS10vol.% was the highest among these samples at 130 °C under a high relative humidity (RH). However at a low RH, the proton-conducting property was not improved by changing the composition of the SnP-NS. These results suggest that the hydrogen-bond network operates effectively for proton conduction at a high RH, but at a low RH, the network fails to conduct as a result of a decrease in water content accompanied by structural stabilization.

Original language	English (US)
Pages (from-to)	8-13
Number of pages	6
Journal	Solid State Ionics
Volume	228
DOIs	https://doi.org/10.1016/j.ssi.2012.08.024
State	Published - Nov 30 2012
Externally published	Yes

Bibliographical note

Funding Information:
The authors are grateful to Toyota Motor Corporation for support of this research through the entrusted research project.

Keywords

Fuel cell
Organic/inorganic nanocomposite
Proton conductivity
Tin phosphate nanosheet

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1016/j.ssi.2012.08.024

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@article{ca76cbef71604b028eac916c47a36429,

title = "Effects of tin phosphate nanosheet addition on proton-conducting properties of sulfonated poly(ether sulfone) membranes",

abstract = "Organic/inorganic composite membranes were prepared by dispersing nanosheets of layered tin phosphate hydrate [Sn(HPO4) 2·nH2O (SnP)] in sulfonated poly(ether sulfone) (SPES) at SnP contents of 0-40 vol.%. The stabilities and proton conductivities of SPES/SnP nanosheet (SnP-NS) composite membranes were investigated and compared with those of SPES/SnP particle (SnP-P) composite membranes. The chemical stabilities as evaluated by thermogravimetry, differential thermal analysis, and diffuse reflectance Fourier-transform infrared spectroscopy were improved in both composite membranes. The improvement in the structural stability of SPES/SnP-NS composite membranes was more evident than that in SPES/SnP-P. The results suggest that exfoliation of SnP increases the area of the SPES-SnP interface and extends the connectivity of the network of hydrogen bonds. A composite membrane containing 10 vol.% SnP-NS (SPES/SnP-NS10vol.%) showed a high conductivity of 5.9 × 10- 2 S cm- 1 at 150 °C under saturated water vapor pressure. Although less water was present in SPES/SnP-NS10vol.% than in SPES/SnP-P10vol.% or pure SPES, the conductivity of SnP-NS10vol.% was the highest among these samples at 130 °C under a high relative humidity (RH). However at a low RH, the proton-conducting property was not improved by changing the composition of the SnP-NS. These results suggest that the hydrogen-bond network operates effectively for proton conduction at a high RH, but at a low RH, the network fails to conduct as a result of a decrease in water content accompanied by structural stabilization.",

keywords = "Fuel cell, Organic/inorganic nanocomposite, Proton conductivity, Tin phosphate nanosheet",

author = "Shoichi Sugata and Shinya Suzuki and Masaru Miyayama and Enrico Traversa and Silvia Licoccia",

note = "Funding Information: The authors are grateful to Toyota Motor Corporation for support of this research through the entrusted research project.",

year = "2012",

month = nov,

day = "30",

doi = "10.1016/j.ssi.2012.08.024",

language = "English (US)",

volume = "228",

pages = "8--13",

journal = "Solid State Ionics",

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TY - JOUR

T1 - Effects of tin phosphate nanosheet addition on proton-conducting properties of sulfonated poly(ether sulfone) membranes

AU - Sugata, Shoichi

AU - Suzuki, Shinya

AU - Miyayama, Masaru

AU - Traversa, Enrico

AU - Licoccia, Silvia

N1 - Funding Information: The authors are grateful to Toyota Motor Corporation for support of this research through the entrusted research project.

PY - 2012/11/30

Y1 - 2012/11/30

N2 - Organic/inorganic composite membranes were prepared by dispersing nanosheets of layered tin phosphate hydrate [Sn(HPO4) 2·nH2O (SnP)] in sulfonated poly(ether sulfone) (SPES) at SnP contents of 0-40 vol.%. The stabilities and proton conductivities of SPES/SnP nanosheet (SnP-NS) composite membranes were investigated and compared with those of SPES/SnP particle (SnP-P) composite membranes. The chemical stabilities as evaluated by thermogravimetry, differential thermal analysis, and diffuse reflectance Fourier-transform infrared spectroscopy were improved in both composite membranes. The improvement in the structural stability of SPES/SnP-NS composite membranes was more evident than that in SPES/SnP-P. The results suggest that exfoliation of SnP increases the area of the SPES-SnP interface and extends the connectivity of the network of hydrogen bonds. A composite membrane containing 10 vol.% SnP-NS (SPES/SnP-NS10vol.%) showed a high conductivity of 5.9 × 10- 2 S cm- 1 at 150 °C under saturated water vapor pressure. Although less water was present in SPES/SnP-NS10vol.% than in SPES/SnP-P10vol.% or pure SPES, the conductivity of SnP-NS10vol.% was the highest among these samples at 130 °C under a high relative humidity (RH). However at a low RH, the proton-conducting property was not improved by changing the composition of the SnP-NS. These results suggest that the hydrogen-bond network operates effectively for proton conduction at a high RH, but at a low RH, the network fails to conduct as a result of a decrease in water content accompanied by structural stabilization.

AB - Organic/inorganic composite membranes were prepared by dispersing nanosheets of layered tin phosphate hydrate [Sn(HPO4) 2·nH2O (SnP)] in sulfonated poly(ether sulfone) (SPES) at SnP contents of 0-40 vol.%. The stabilities and proton conductivities of SPES/SnP nanosheet (SnP-NS) composite membranes were investigated and compared with those of SPES/SnP particle (SnP-P) composite membranes. The chemical stabilities as evaluated by thermogravimetry, differential thermal analysis, and diffuse reflectance Fourier-transform infrared spectroscopy were improved in both composite membranes. The improvement in the structural stability of SPES/SnP-NS composite membranes was more evident than that in SPES/SnP-P. The results suggest that exfoliation of SnP increases the area of the SPES-SnP interface and extends the connectivity of the network of hydrogen bonds. A composite membrane containing 10 vol.% SnP-NS (SPES/SnP-NS10vol.%) showed a high conductivity of 5.9 × 10- 2 S cm- 1 at 150 °C under saturated water vapor pressure. Although less water was present in SPES/SnP-NS10vol.% than in SPES/SnP-P10vol.% or pure SPES, the conductivity of SnP-NS10vol.% was the highest among these samples at 130 °C under a high relative humidity (RH). However at a low RH, the proton-conducting property was not improved by changing the composition of the SnP-NS. These results suggest that the hydrogen-bond network operates effectively for proton conduction at a high RH, but at a low RH, the network fails to conduct as a result of a decrease in water content accompanied by structural stabilization.

KW - Fuel cell

KW - Organic/inorganic nanocomposite

KW - Proton conductivity

KW - Tin phosphate nanosheet

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U2 - 10.1016/j.ssi.2012.08.024

DO - 10.1016/j.ssi.2012.08.024

M3 - Article

AN - SCOPUS:84869380360

SN - 0167-2738

VL - 228

SP - 8

EP - 13

JO - Solid State Ionics

JF - Solid State Ionics

ER -

Effects of tin phosphate nanosheet addition on proton-conducting properties of sulfonated poly(ether sulfone) membranes

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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