CsH5(PO4)2 doped glass membranes for intermediate temperature fuel cells

Geletu Qing; Ryuji Kikuchi; Atsushi Takagaki; Takashi Sugawara; Shigeo Ted Oyama

doi:10.1016/j.jpowsour.2014.09.025

CsH₅(PO₄)₂ doped glass membranes for intermediate temperature fuel cells

Geletu Qing, Ryuji Kikuchi, Atsushi Takagaki, Takashi Sugawara, Shigeo Ted Oyama

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

11 Citations (Scopus)

Abstract

This study reports the preparation of glass membranes doped with CsH₅(PO₄)₂ by an optimized sol - gel method using phosphoric acid as a catalyst for tetraethylorthosilicate (TEOS) hydrolysis and the application of these membranes in intermediate temperature fuel cells (ITFCs). Infrared spectroscopy shows the formation of Si - O - P bonds and scanning electron microscopy shows that the glass membranes have smooth cross-sectional structures. Domains of CsH₅(PO₄)₂ with sizes of 5-12 nm are uniformly distributed over the membrane cross section. The melting point of CsH₅(PO₄)₂ in the glass membrane is lower by 20-40°C than that for pure CsH₅(PO₄)₂. For a glass membrane with a molar ratio of SiO₂:CsH₅(PO₄)₂:H₃PO₄ = 4:1:0.36, 62% of the pore volume is filled with CsH₅(PO₄)₂ and shows the best electrochemical performance. The glass membrane shows high conductivity of 22 mS cm^-1 at 219°C. The membrane is novel because the silica support forms an interconnected matrix that provides stability, as shown by continuous operation at 210°C for at least 50 h. A fuel cell assembled with the glass membrane exhibits an open circuit voltage of 0.94 V and a peak power density of 85 mW cm^-2. The fuel cell produces a stable output voltage of 0.53 V for at least 50 h under a current density of 100 mA cm^-2.

Original language	English
Pages (from-to)	1018-1029
Number of pages	12
Journal	Journal of Power Sources
Volume	272
DOIs	https://doi.org/10.1016/j.jpowsour.2014.09.025
Publication status	Published - Dec 25 2014
Externally published	Yes

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.jpowsour.2014.09.025

Cite this

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title = "CsH5(PO4)2 doped glass membranes for intermediate temperature fuel cells",

abstract = "This study reports the preparation of glass membranes doped with CsH5(PO4)2 by an optimized sol - gel method using phosphoric acid as a catalyst for tetraethylorthosilicate (TEOS) hydrolysis and the application of these membranes in intermediate temperature fuel cells (ITFCs). Infrared spectroscopy shows the formation of Si - O - P bonds and scanning electron microscopy shows that the glass membranes have smooth cross-sectional structures. Domains of CsH5(PO4)2 with sizes of 5-12 nm are uniformly distributed over the membrane cross section. The melting point of CsH5(PO4)2 in the glass membrane is lower by 20-40°C than that for pure CsH5(PO4)2. For a glass membrane with a molar ratio of SiO2:CsH5(PO4)2:H3PO4 = 4:1:0.36, 62% of the pore volume is filled with CsH5(PO4)2 and shows the best electrochemical performance. The glass membrane shows high conductivity of 22 mS cm-1 at 219°C. The membrane is novel because the silica support forms an interconnected matrix that provides stability, as shown by continuous operation at 210°C for at least 50 h. A fuel cell assembled with the glass membrane exhibits an open circuit voltage of 0.94 V and a peak power density of 85 mW cm-2. The fuel cell produces a stable output voltage of 0.53 V for at least 50 h under a current density of 100 mA cm-2.",

author = "Geletu Qing and Ryuji Kikuchi and Atsushi Takagaki and Takashi Sugawara and Oyama, {Shigeo Ted}",

year = "2014",

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T1 - CsH5(PO4)2 doped glass membranes for intermediate temperature fuel cells

AU - Qing, Geletu

AU - Kikuchi, Ryuji

AU - Takagaki, Atsushi

AU - Sugawara, Takashi

AU - Oyama, Shigeo Ted

PY - 2014/12/25

Y1 - 2014/12/25

N2 - This study reports the preparation of glass membranes doped with CsH5(PO4)2 by an optimized sol - gel method using phosphoric acid as a catalyst for tetraethylorthosilicate (TEOS) hydrolysis and the application of these membranes in intermediate temperature fuel cells (ITFCs). Infrared spectroscopy shows the formation of Si - O - P bonds and scanning electron microscopy shows that the glass membranes have smooth cross-sectional structures. Domains of CsH5(PO4)2 with sizes of 5-12 nm are uniformly distributed over the membrane cross section. The melting point of CsH5(PO4)2 in the glass membrane is lower by 20-40°C than that for pure CsH5(PO4)2. For a glass membrane with a molar ratio of SiO2:CsH5(PO4)2:H3PO4 = 4:1:0.36, 62% of the pore volume is filled with CsH5(PO4)2 and shows the best electrochemical performance. The glass membrane shows high conductivity of 22 mS cm-1 at 219°C. The membrane is novel because the silica support forms an interconnected matrix that provides stability, as shown by continuous operation at 210°C for at least 50 h. A fuel cell assembled with the glass membrane exhibits an open circuit voltage of 0.94 V and a peak power density of 85 mW cm-2. The fuel cell produces a stable output voltage of 0.53 V for at least 50 h under a current density of 100 mA cm-2.

AB - This study reports the preparation of glass membranes doped with CsH5(PO4)2 by an optimized sol - gel method using phosphoric acid as a catalyst for tetraethylorthosilicate (TEOS) hydrolysis and the application of these membranes in intermediate temperature fuel cells (ITFCs). Infrared spectroscopy shows the formation of Si - O - P bonds and scanning electron microscopy shows that the glass membranes have smooth cross-sectional structures. Domains of CsH5(PO4)2 with sizes of 5-12 nm are uniformly distributed over the membrane cross section. The melting point of CsH5(PO4)2 in the glass membrane is lower by 20-40°C than that for pure CsH5(PO4)2. For a glass membrane with a molar ratio of SiO2:CsH5(PO4)2:H3PO4 = 4:1:0.36, 62% of the pore volume is filled with CsH5(PO4)2 and shows the best electrochemical performance. The glass membrane shows high conductivity of 22 mS cm-1 at 219°C. The membrane is novel because the silica support forms an interconnected matrix that provides stability, as shown by continuous operation at 210°C for at least 50 h. A fuel cell assembled with the glass membrane exhibits an open circuit voltage of 0.94 V and a peak power density of 85 mW cm-2. The fuel cell produces a stable output voltage of 0.53 V for at least 50 h under a current density of 100 mA cm-2.

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