CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production
Composites consisting of carbon nanotubes (CNTs) grown directly on oxygen-deficient anatase TiO2 (TiO2−δ) were synthesized by a two-step chemical vapor deposition (CVD) method and applied in photocatalytic hydrogen production from aqueous methanol solutions using photodeposited Pt as the co-catalys...
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doaj-f7a1cdc1b0ae4d4a8478114ae5a0d44c2020-11-25T01:57:11ZengMDPI AGCatalysts2073-43442015-03-015127028510.3390/catal5010270catal5010270CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen ProductionPeirong Chen0Lidong Wang1Ping Wang2Aleksander Kostka3Michael Wark4Martin Muhler5Radim Beranek6Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätstrasse 150, 44780 Bochum, GermanyInorganic Chemistry, Ruhr-University Bochum, Universitätstrasse 150, 44780 Bochum, GermanyLaboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätstrasse 150, 44780 Bochum, GermanyDepartment of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Max-Planck-Strasse 1, 40237 Düsseldorf, GermanyLaboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätstrasse 150, 44780 Bochum, GermanyLaboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätstrasse 150, 44780 Bochum, GermanyInorganic Chemistry, Ruhr-University Bochum, Universitätstrasse 150, 44780 Bochum, GermanyComposites consisting of carbon nanotubes (CNTs) grown directly on oxygen-deficient anatase TiO2 (TiO2−δ) were synthesized by a two-step chemical vapor deposition (CVD) method and applied in photocatalytic hydrogen production from aqueous methanol solutions using photodeposited Pt as the co-catalyst. Thermogravimetry coupled with mass spectroscopy, X-ray diffraction, scanning electron microscopy, photocurrent analysis, X-ray photoelectron spectroscopy, and (scanning) transmission electron microscopy were performed to investigate the physical and (photo)chemical properties of the synthesized CNT-TiO2−δ composites before and after photocatalytic methanol reforming. The initial photocatalytic activity of TiO2 was found to be significantly improved in the presence of oxygen vacancies. An optimized amount (~7.2 wt%) of CNTs grown on the TiO2−δ surface led to a highly effective stabilization of the photocatalytic performance of TiO2−δ, which is attributed to the improved dispersion and stability of the photodeposited Pt co-catalyst nanoparticles and enhanced separation efficiency of photogenerated electron-hole pairs, rendering the photocatalysts less prone to deactivation.http://www.mdpi.com/2073-4344/5/1/270carbon nanotubesTiO2oxygen deficiencyphotocatalytic hydrogen productionplatinum co-catalyststability |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Peirong Chen Lidong Wang Ping Wang Aleksander Kostka Michael Wark Martin Muhler Radim Beranek |
spellingShingle |
Peirong Chen Lidong Wang Ping Wang Aleksander Kostka Michael Wark Martin Muhler Radim Beranek CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production Catalysts carbon nanotubes TiO2 oxygen deficiency photocatalytic hydrogen production platinum co-catalyst stability |
author_facet |
Peirong Chen Lidong Wang Ping Wang Aleksander Kostka Michael Wark Martin Muhler Radim Beranek |
author_sort |
Peirong Chen |
title |
CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production |
title_short |
CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production |
title_full |
CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production |
title_fullStr |
CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production |
title_full_unstemmed |
CNT-TiO2−δ Composites for Improved Co-Catalyst Dispersion and Stabilized Photocatalytic Hydrogen Production |
title_sort |
cnt-tio2−δ composites for improved co-catalyst dispersion and stabilized photocatalytic hydrogen production |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2015-03-01 |
description |
Composites consisting of carbon nanotubes (CNTs) grown directly on oxygen-deficient anatase TiO2 (TiO2−δ) were synthesized by a two-step chemical vapor deposition (CVD) method and applied in photocatalytic hydrogen production from aqueous methanol solutions using photodeposited Pt as the co-catalyst. Thermogravimetry coupled with mass spectroscopy, X-ray diffraction, scanning electron microscopy, photocurrent analysis, X-ray photoelectron spectroscopy, and (scanning) transmission electron microscopy were performed to investigate the physical and (photo)chemical properties of the synthesized CNT-TiO2−δ composites before and after photocatalytic methanol reforming. The initial photocatalytic activity of TiO2 was found to be significantly improved in the presence of oxygen vacancies. An optimized amount (~7.2 wt%) of CNTs grown on the TiO2−δ surface led to a highly effective stabilization of the photocatalytic performance of TiO2−δ, which is attributed to the improved dispersion and stability of the photodeposited Pt co-catalyst nanoparticles and enhanced separation efficiency of photogenerated electron-hole pairs, rendering the photocatalysts less prone to deactivation. |
topic |
carbon nanotubes TiO2 oxygen deficiency photocatalytic hydrogen production platinum co-catalyst stability |
url |
http://www.mdpi.com/2073-4344/5/1/270 |
work_keys_str_mv |
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