Micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles
Ordered microporous carbons containing dispersed platinum nanoparticles were fabricated and chosen as suitable models to investigate micro-structure development and hydrogen transport properties of zeolite-templated carbons. X-ray photoelectron spectroscopy analysis revealed that the enhanced heat o...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Journal Article |
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Pergamon
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/31207 |
| _version_ | 1848753313159315456 |
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| author | Yang, Y. Brown, C. Zhao, C. Chaffee, A. Nick, B. Zhao, D. Webley, P. Schalch, J. Simmons, J. Liu, Y. her, J. Buckley, Craig Sheppard, Drew |
| author_facet | Yang, Y. Brown, C. Zhao, C. Chaffee, A. Nick, B. Zhao, D. Webley, P. Schalch, J. Simmons, J. Liu, Y. her, J. Buckley, Craig Sheppard, Drew |
| author_sort | Yang, Y. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Ordered microporous carbons containing dispersed platinum nanoparticles were fabricated and chosen as suitable models to investigate micro-structure development and hydrogen transport properties of zeolite-templated carbons. X-ray photoelectron spectroscopy analysis revealed that the enhanced heat of adsorption is related to the narrow micro-channels templated from the zeolite and the presence of certain Csingle bondO groups on the carbon. The lack of a well-defined and intense rotational transition line and the persistent broad H2 recoil spectrum in neutron scattering results suggests a distribution of binding sites. Most interestingly, hydrogen diffusion occurs on two time scales, consisting of a fast liquid-like jump diffusion on the timescale of picoseconds along with an even faster bulk-like diffusion. The liquid-like motion is characterized by a diffusion constant of (2.1 ± 0.3) × 10−8 m2/s with an activation energy of ca. 77 K; both values indicate somewhat lower mobility than similar dynamics of H2 on nanotubes, activated carbon XC-72, or Grafoil, yet greater mobility than that of bulk liquid. These unusual characteristics for hydrogen in carbons are believed to arise from the network of narrow pores in this zeolite-templated image of the zeolite. In fact, the diffusion constants of the templated carbons are extremely similar to those measured for zeolite 13X. |
| first_indexed | 2025-11-14T08:22:32Z |
| format | Journal Article |
| id | curtin-20.500.11937-31207 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:22:32Z |
| publishDate | 2011 |
| publisher | Pergamon |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-312072017-09-13T15:13:58Z Micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles Yang, Y. Brown, C. Zhao, C. Chaffee, A. Nick, B. Zhao, D. Webley, P. Schalch, J. Simmons, J. Liu, Y. her, J. Buckley, Craig Sheppard, Drew Ordered microporous carbons containing dispersed platinum nanoparticles were fabricated and chosen as suitable models to investigate micro-structure development and hydrogen transport properties of zeolite-templated carbons. X-ray photoelectron spectroscopy analysis revealed that the enhanced heat of adsorption is related to the narrow micro-channels templated from the zeolite and the presence of certain Csingle bondO groups on the carbon. The lack of a well-defined and intense rotational transition line and the persistent broad H2 recoil spectrum in neutron scattering results suggests a distribution of binding sites. Most interestingly, hydrogen diffusion occurs on two time scales, consisting of a fast liquid-like jump diffusion on the timescale of picoseconds along with an even faster bulk-like diffusion. The liquid-like motion is characterized by a diffusion constant of (2.1 ± 0.3) × 10−8 m2/s with an activation energy of ca. 77 K; both values indicate somewhat lower mobility than similar dynamics of H2 on nanotubes, activated carbon XC-72, or Grafoil, yet greater mobility than that of bulk liquid. These unusual characteristics for hydrogen in carbons are believed to arise from the network of narrow pores in this zeolite-templated image of the zeolite. In fact, the diffusion constants of the templated carbons are extremely similar to those measured for zeolite 13X. 2011 Journal Article http://hdl.handle.net/20.500.11937/31207 10.1016/j.carbon.2010.11.050 Pergamon restricted |
| spellingShingle | Yang, Y. Brown, C. Zhao, C. Chaffee, A. Nick, B. Zhao, D. Webley, P. Schalch, J. Simmons, J. Liu, Y. her, J. Buckley, Craig Sheppard, Drew Micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles |
| title | Micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles |
| title_full | Micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles |
| title_fullStr | Micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles |
| title_full_unstemmed | Micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles |
| title_short | Micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles |
| title_sort | micro-channel development and hydrogen adsorption properties in templated microporous carbons containing platinum nanoparticles |
| url | http://hdl.handle.net/20.500.11937/31207 |