Self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells
A highly ordered inorganic electrolyte based on 12-tungstophosphoric acid (H3PW12O40, abbreviated as HPW or PWA)–silica mesoporous nanocomposite was synthesized through a facile one-step self-assembly between the positively charged silica precursor and negatively charged PW12O40 3- species. The self...
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| Format: | Journal Article |
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The Royal Society of Chemistry
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/43222 |
| _version_ | 1848756630736338944 |
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| author | Tang, H. Pan, M. Jiang, San ping |
| author_facet | Tang, H. Pan, M. Jiang, San ping |
| author_sort | Tang, H. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A highly ordered inorganic electrolyte based on 12-tungstophosphoric acid (H3PW12O40, abbreviated as HPW or PWA)–silica mesoporous nanocomposite was synthesized through a facile one-step self-assembly between the positively charged silica precursor and negatively charged PW12O40 3- species. The self-assembled HPW–silica nanocomposites were characterized by small-angle XRD, TEM, nitrogen adsorption–desorption isotherms, ion exchange capacity, proton conductivity and solid-state 31P NMR. The results show that highly ordered and uniform nanoarrays with long-range order are formed when the HPW content in the nanocomposites is equal to or lower than 25 wt%. The mesoporous structures/textures were clearly presented, with nanochannels of 3.2–3.5 nm in diameter. The 31P NMR results indicates that there are ( SiOH2 +)(H2PW12O40 -) species in the HPW–silica nanocomposites. A HPW–silica (25/75 w/o) nanocomposite gave an activation energy of 13.0 kJ mol-1 and proton conductivity of 0.076 S cm-1 at 100 ◦C and 100 RH%, and an activation energy of 26.1 kJ mol-1 and proton conductivity of 0.05 S cm-1 at 200 ◦C with no external humidification. A fuel cell based on a 165 mm thick HPW–silica nanocomposite membrane achieved a maximum power output of 128.5 and 112.0 mW cm-2 for methanol and ethanol fuels, respectively, at 200 ◦C. The high proton conductivity and good performance demonstrate the excellent water retention capability and great potential of the highly ordered HPW–silica mesoporous nanocomposites as high-temperature proton exchange membranes for direct alcohol fuel cells (DAFCs). |
| first_indexed | 2025-11-14T09:15:15Z |
| format | Journal Article |
| id | curtin-20.500.11937-43222 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:15:15Z |
| publishDate | 2011 |
| publisher | The Royal Society of Chemistry |
| recordtype | eprints |
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| spelling | curtin-20.500.11937-432222017-09-13T15:55:52Z Self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells Tang, H. Pan, M. Jiang, San ping A highly ordered inorganic electrolyte based on 12-tungstophosphoric acid (H3PW12O40, abbreviated as HPW or PWA)–silica mesoporous nanocomposite was synthesized through a facile one-step self-assembly between the positively charged silica precursor and negatively charged PW12O40 3- species. The self-assembled HPW–silica nanocomposites were characterized by small-angle XRD, TEM, nitrogen adsorption–desorption isotherms, ion exchange capacity, proton conductivity and solid-state 31P NMR. The results show that highly ordered and uniform nanoarrays with long-range order are formed when the HPW content in the nanocomposites is equal to or lower than 25 wt%. The mesoporous structures/textures were clearly presented, with nanochannels of 3.2–3.5 nm in diameter. The 31P NMR results indicates that there are ( SiOH2 +)(H2PW12O40 -) species in the HPW–silica nanocomposites. A HPW–silica (25/75 w/o) nanocomposite gave an activation energy of 13.0 kJ mol-1 and proton conductivity of 0.076 S cm-1 at 100 ◦C and 100 RH%, and an activation energy of 26.1 kJ mol-1 and proton conductivity of 0.05 S cm-1 at 200 ◦C with no external humidification. A fuel cell based on a 165 mm thick HPW–silica nanocomposite membrane achieved a maximum power output of 128.5 and 112.0 mW cm-2 for methanol and ethanol fuels, respectively, at 200 ◦C. The high proton conductivity and good performance demonstrate the excellent water retention capability and great potential of the highly ordered HPW–silica mesoporous nanocomposites as high-temperature proton exchange membranes for direct alcohol fuel cells (DAFCs). 2011 Journal Article http://hdl.handle.net/20.500.11937/43222 10.1039/c1dt10150a The Royal Society of Chemistry restricted |
| spellingShingle | Tang, H. Pan, M. Jiang, San ping Self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells |
| title | Self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells |
| title_full | Self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells |
| title_fullStr | Self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells |
| title_full_unstemmed | Self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells |
| title_short | Self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells |
| title_sort | self assembled 12-tungstophosphoric acid-silica mesoporous nanocomposites as proton exchange membranes for direct alcohol fuel cells |
| url | http://hdl.handle.net/20.500.11937/43222 |