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Photocatalytic H_2 production on trititanate nanotubes coupled with CdS and platinum nanoparticles under visible light: revisiting H_2 production and material durability

Park, Hyunwoong and Ou, Hsin-Hung and Kim, Minju and Kang, Unseock and Han, Dong Suk and Hoffmann, Michael R. (2017) Photocatalytic H_2 production on trititanate nanotubes coupled with CdS and platinum nanoparticles under visible light: revisiting H_2 production and material durability. Faraday Discussions, 198 . pp. 419-431. ISSN 1359-6640. https://resolver.caltech.edu/CaltechAUTHORS:20170308-085316538

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Abstract

The photocatalytic production of molecular hydrogen (H_2) on ternary composites of Pt, CdS, and sodium trititanate nanotubes (Na_xH_(2−x)Ti_3O_7, TNTs) is examined in an aqueous 2-propanol (IPA) solution (typically 5 vol%) at a circum-neutral pH under visible light (λ > 420 nm). The H2 production rates are dependent on the Pt-loading level, and the optimum production rate in the Pt/CdS/TNTs is approximately six times higher than that in Pt/CdS/TiO_2. A D2O solution containing 5 vol% IPA leads only to the production of D_2 molecules, whereas increasing the IPA amount to 30 vol% leads to the production of DH molecules. This indicates that the Pt/CdS/TNTs composites enable H_2 production via true water splitting under our typical experimental conditions. X-ray photoelectron spectroscopy (XPS) analyses of the as-synthesized Pt/CdS/TNTs and those used for 6 and 12 h show that metallic Pt on the CdS/TNTs is less susceptible to oxidation than Pt on CdS/TiO_2. In addition, photocorrosion of CdS (i.e., sulfate formation) is significantly inhibited during the photocatalytic H_2 production reactions in the Pt/CdS/TNTs because of the efficient charge transfer via the TNTs framework. The Pt/CdS/TNTs samples are thermally more stable than Pt/CdS/TiO_2 and CdS/TNTs, effectively inhibiting the formation of CdO during the thermal synthesis. Detailed surface characterizations of the as-synthesized ternary composites are performed using X-ray diffraction, transmission electron microscopy, energy dispersive spectroscopy, and XPS.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c6fd00192kDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2017/FD/C6FD00192KPublisherArticle
ORCID:
AuthorORCID
Park, Hyunwoong0000-0002-4938-6907
Han, Dong Suk0000-0002-4804-5369
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2017 The Royal Society of Chemistry. Received 19 Sep 2016, Accepted 07 Nov 2016, First published online 07 Nov 2016. This research was supported by the Global Research Network Program (2014S1A2A2027802), the Basic Science Research Program (2016R1A2B4007366), and the Nano Material Technology Development Program (2016M3A7B4908169) through the National Research Foundation, Korea. In addition, we are grateful to the Korea CCS R&D Center (KCRC) (No. 2014M1A8A1049354) for financial support. This publication was made possible by a grant from the Qatar National Research Fund under its National Priorities Research Program (NPRP 9-052-2-020).
Funders:
Funding AgencyGrant Number
National Research Foundation of Korea2014S1A2A2027802
National Research Foundation of Korea2016R1A2B4007366
National Research Foundation of Korea2016M3A7B4908169
Korea CCS R&D Center (KCRC)2014M1A8A1049354
Qatar National Research FundNPRP 9-052-2-020
Record Number:CaltechAUTHORS:20170308-085316538
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170308-085316538
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74886
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 Mar 2017 17:28
Last Modified:09 Mar 2020 13:19

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