Effect of pt loading order on photocatalytic activity of Pt/TiO2 nanofiber in generation of H2from neat ethanol

Feng Chieh Wang, Chun Hsuan Liu, Chih Wei Liu, Jiunn Hsing Chao, Chiu-Hsun Lin

Research output: Contribution to journalArticle

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Abstract

TiO2 nanofibers that are loaded with 1 wt % Pt metal that is introduced at different stages of the wet impregnation procedure have very different photocatalytic activities. Two photocatalysts prepared using different procedures were denoted as PtHTN and PtB catalysts. The former was prepared by impregnating hydrogen trititanate nanofibers (H2Ti3O 7, abbreviated as HTN) directly with H2PtCl6, before calcining between 573 and 873 K and then reducing at 423 K in flowing hydrogen. The latter was prepared by initially calcining HTN nanofiber between 573 and 873 K to yield TiO2 nanofiber, and then impregnating this TiO2 support with H2PtCl6; the support was then calcined and reduced as PtHTN to produce PtB catalysts. Although most of their physical properties such as surface area, pore volume, crystalline phase composition and crystallinity, capability to absorb UV light, and band gap energy are quite similar, the optimized H2 yield over PtB catalyst in the photocatalytic dehydrogenation of neat ethanol was 1.86 times that over PtHTN catalyst. XPS and subambient temperature temperature-programmed reduction indicated that the stronger photocatalytic activity of PtB was associated with its higher surface Pt concentration and better reducibility and electron conductivity. The specific Pt impregnation order generated in the PtHTN catalyst a strong interaction between the Pt nanoparticles and the TiO2 nanofiber surface that was not present in the PtB catalyst. This interaction was revealed by the particular microstructure at the Pt - nanofiber interface, as observed by HRTEM, which was responsible for the marked difference between the electronic properties and the photocatalytic activities of the two catalysts.

Original languageEnglish
Pages (from-to)13832-13840
Number of pages9
JournalJournal of Physical Chemistry C
Volume113
Issue number31
DOIs
Publication statusPublished - 2009 Aug 6

Fingerprint

Nanofibers
Ethanol
ethyl alcohol
catalysts
Catalysts
impregnating
Impregnation
Hydrogen
hydrogen
Dehydrogenation
Photocatalysts
dehydrogenation
Phase composition
Ultraviolet radiation
Electronic properties
crystallinity
Energy gap
Thermodynamic properties
X ray photoelectron spectroscopy
Physical properties

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Wang, Feng Chieh ; Liu, Chun Hsuan ; Liu, Chih Wei ; Chao, Jiunn Hsing ; Lin, Chiu-Hsun. / Effect of pt loading order on photocatalytic activity of Pt/TiO2 nanofiber in generation of H2from neat ethanol. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 31. pp. 13832-13840.
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abstract = "TiO2 nanofibers that are loaded with 1 wt {\%} Pt metal that is introduced at different stages of the wet impregnation procedure have very different photocatalytic activities. Two photocatalysts prepared using different procedures were denoted as PtHTN and PtB catalysts. The former was prepared by impregnating hydrogen trititanate nanofibers (H2Ti3O 7, abbreviated as HTN) directly with H2PtCl6, before calcining between 573 and 873 K and then reducing at 423 K in flowing hydrogen. The latter was prepared by initially calcining HTN nanofiber between 573 and 873 K to yield TiO2 nanofiber, and then impregnating this TiO2 support with H2PtCl6; the support was then calcined and reduced as PtHTN to produce PtB catalysts. Although most of their physical properties such as surface area, pore volume, crystalline phase composition and crystallinity, capability to absorb UV light, and band gap energy are quite similar, the optimized H2 yield over PtB catalyst in the photocatalytic dehydrogenation of neat ethanol was 1.86 times that over PtHTN catalyst. XPS and subambient temperature temperature-programmed reduction indicated that the stronger photocatalytic activity of PtB was associated with its higher surface Pt concentration and better reducibility and electron conductivity. The specific Pt impregnation order generated in the PtHTN catalyst a strong interaction between the Pt nanoparticles and the TiO2 nanofiber surface that was not present in the PtB catalyst. This interaction was revealed by the particular microstructure at the Pt - nanofiber interface, as observed by HRTEM, which was responsible for the marked difference between the electronic properties and the photocatalytic activities of the two catalysts.",
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Effect of pt loading order on photocatalytic activity of Pt/TiO2 nanofiber in generation of H2from neat ethanol. / Wang, Feng Chieh; Liu, Chun Hsuan; Liu, Chih Wei; Chao, Jiunn Hsing; Lin, Chiu-Hsun.

In: Journal of Physical Chemistry C, Vol. 113, No. 31, 06.08.2009, p. 13832-13840.

Research output: Contribution to journalArticle

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T1 - Effect of pt loading order on photocatalytic activity of Pt/TiO2 nanofiber in generation of H2from neat ethanol

AU - Wang, Feng Chieh

AU - Liu, Chun Hsuan

AU - Liu, Chih Wei

AU - Chao, Jiunn Hsing

AU - Lin, Chiu-Hsun

PY - 2009/8/6

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N2 - TiO2 nanofibers that are loaded with 1 wt % Pt metal that is introduced at different stages of the wet impregnation procedure have very different photocatalytic activities. Two photocatalysts prepared using different procedures were denoted as PtHTN and PtB catalysts. The former was prepared by impregnating hydrogen trititanate nanofibers (H2Ti3O 7, abbreviated as HTN) directly with H2PtCl6, before calcining between 573 and 873 K and then reducing at 423 K in flowing hydrogen. The latter was prepared by initially calcining HTN nanofiber between 573 and 873 K to yield TiO2 nanofiber, and then impregnating this TiO2 support with H2PtCl6; the support was then calcined and reduced as PtHTN to produce PtB catalysts. Although most of their physical properties such as surface area, pore volume, crystalline phase composition and crystallinity, capability to absorb UV light, and band gap energy are quite similar, the optimized H2 yield over PtB catalyst in the photocatalytic dehydrogenation of neat ethanol was 1.86 times that over PtHTN catalyst. XPS and subambient temperature temperature-programmed reduction indicated that the stronger photocatalytic activity of PtB was associated with its higher surface Pt concentration and better reducibility and electron conductivity. The specific Pt impregnation order generated in the PtHTN catalyst a strong interaction between the Pt nanoparticles and the TiO2 nanofiber surface that was not present in the PtB catalyst. This interaction was revealed by the particular microstructure at the Pt - nanofiber interface, as observed by HRTEM, which was responsible for the marked difference between the electronic properties and the photocatalytic activities of the two catalysts.

AB - TiO2 nanofibers that are loaded with 1 wt % Pt metal that is introduced at different stages of the wet impregnation procedure have very different photocatalytic activities. Two photocatalysts prepared using different procedures were denoted as PtHTN and PtB catalysts. The former was prepared by impregnating hydrogen trititanate nanofibers (H2Ti3O 7, abbreviated as HTN) directly with H2PtCl6, before calcining between 573 and 873 K and then reducing at 423 K in flowing hydrogen. The latter was prepared by initially calcining HTN nanofiber between 573 and 873 K to yield TiO2 nanofiber, and then impregnating this TiO2 support with H2PtCl6; the support was then calcined and reduced as PtHTN to produce PtB catalysts. Although most of their physical properties such as surface area, pore volume, crystalline phase composition and crystallinity, capability to absorb UV light, and band gap energy are quite similar, the optimized H2 yield over PtB catalyst in the photocatalytic dehydrogenation of neat ethanol was 1.86 times that over PtHTN catalyst. XPS and subambient temperature temperature-programmed reduction indicated that the stronger photocatalytic activity of PtB was associated with its higher surface Pt concentration and better reducibility and electron conductivity. The specific Pt impregnation order generated in the PtHTN catalyst a strong interaction between the Pt nanoparticles and the TiO2 nanofiber surface that was not present in the PtB catalyst. This interaction was revealed by the particular microstructure at the Pt - nanofiber interface, as observed by HRTEM, which was responsible for the marked difference between the electronic properties and the photocatalytic activities of the two catalysts.

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