Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/99261
Title: Correlation between proton conductivity, thermal stability and structural symmetries in novel HPW-meso-silica nanocomposite membranes and their performance in direct methanol fuel cells
Authors: Zeng, Jie
Shen, Pei Kong
Lu, Shanfu
Xiang, Yan
Li, Lin
De Marco, Roland
Jiang, San Ping
Keywords: DRNTU::Engineering::Mechanical engineering
Issue Date: 2012
Source: Zeng, J., Shen, P. K., Lu, S., Xiang, Y., Li, L., De Marco, R., & Jiang, S. P. (2012). Correlation between proton conductivity, thermal stability and structural symmetries in novel HPW-meso-silica nanocomposite membranes and their performance in direct methanol fuel cells. Journal of membrane science, 397-398, 92-101.
Series/Report no.: Journal of membrane science
Abstract: The intrinsic relationship between proton conductivity, thermal stability and structural symmetries of phosphotungstic acid (HPW)-functionalized mesoporous silica (HPW-meso-silica) membrane was investigated with mesoporous silica from 2D hexagonal p6mm, 3D face-centered cubic (View the MathML source), body-centered View the MathML source, to cubic bicontinuous View the MathML source symmetries. HPW-meso-silica nanocomposites with 3D mesostructures display a significantly higher proton conductivity and higher stability as a function of relative humidity in comparison to 2D mesostructures. The best result was obtained with body-centered cubic (View the MathML source)-HPW-meso-silica, showing proton conductivities of 0.061 S cm−1 at 25 °C and 0.14 S cm−1 at 150 °C, respectively, and an activation energy of 10.0 kJ mol−1. At 150 °C, the cell employing a HPW-meso-silica membrane produced a maximum power output of 237 mW cm−2 in a methanol fuel without external humidification. The high proton conductivity and excellent performance of the new methanol fuel cells demonstrate the promise of HPW-meso-silica nanocomposites with 3D mesostructures as a new class of inorganic proton exchange membranes for use in direct methanol fuel cells (DMFCs).
URI: https://hdl.handle.net/10356/99261
http://hdl.handle.net/10220/13627
DOI: 10.1016/j.memsci.2012.01.018
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MAE Journal Articles

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