Hierarchical top-porous/bottom-tubular TiO 2 nanostructures decorated with Pd nanoparticles for efficient photoelectrocatalytic decomposition of synergistic pollutants

Handle URI:
http://hdl.handle.net/10754/562098
Title:
Hierarchical top-porous/bottom-tubular TiO 2 nanostructures decorated with Pd nanoparticles for efficient photoelectrocatalytic decomposition of synergistic pollutants
Authors:
Zhang, Zhonghai; Yu, Yanjie; Wang, Peng ( 0000-0003-0856-0865 )
Abstract:
In this paper, top-porous and bottom-tubular TiO 2 nanotubes (TiO 2 NTs) loaded with palladium nanoparticles (Pd/TiO 2 NTs) were fabricated as an electrode for an enhanced photoelectrocatalytic (PEC) activity toward organic dye decomposition. TiO 2 NTs with a unique hierarchical top-porous and bottom-tubular structure were prepared by a facile two-step anodization method and Pd nanoparticles were decorated onto the TiO 2 NTs via a photoreduction process. The PEC activity of Pd/TiO 2 NTs was investigated by decomposition of methylene blue (MB) and Rhodamine B (RhB). Because of formation Schottky junctions between TiO 2 and Pd, which significantly promoted the electron transfer and reduced the recombination of photogenerated electrons and holes, the Pd/TiO 2 NT electrode showed significantly higher PEC activities than TiO 2 NTs. Interestingly, an obvious synergy between two dyes was observed and corresponding mechanism based on facilitated transfer of electrons and holes as a result of a suitable energy level alignment was suggested. The findings of this work provide a fundamental insight not only into the fabrication but also utility of Schottky junctions for enhanced environmental remediation processes. © 2012 American Chemical Society.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Water Desalination and Reuse Research Center (WDRC); Environmental Science and Engineering Program; Water Desalination & Reuse Research Cntr; Environmental Nanotechnology Lab
Publisher:
American Chemical Society
Journal:
ACS Applied Materials and Interfaces
Issue Date:
22-Feb-2012
DOI:
10.1021/am201630s
Type:
Article
ISSN:
19448244
Sponsors:
This work was supported by KAUST baseline fund. We thank Dr. Lan Zhao, Dr. Bei Zhang, and Dr. Mohamed Nejib Hedhili from King Abdullah University of Science and Technology (KAUST) for their help with SEM, XRD, and XPS, respectively. Z.Z acknowledges a Sabic Postdoctoral Fellowship.
Appears in Collections:
Articles; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Zhonghaien
dc.contributor.authorYu, Yanjieen
dc.contributor.authorWang, Pengen
dc.date.accessioned2015-08-03T09:44:44Zen
dc.date.available2015-08-03T09:44:44Zen
dc.date.issued2012-02-22en
dc.identifier.issn19448244en
dc.identifier.doi10.1021/am201630sen
dc.identifier.urihttp://hdl.handle.net/10754/562098en
dc.description.abstractIn this paper, top-porous and bottom-tubular TiO 2 nanotubes (TiO 2 NTs) loaded with palladium nanoparticles (Pd/TiO 2 NTs) were fabricated as an electrode for an enhanced photoelectrocatalytic (PEC) activity toward organic dye decomposition. TiO 2 NTs with a unique hierarchical top-porous and bottom-tubular structure were prepared by a facile two-step anodization method and Pd nanoparticles were decorated onto the TiO 2 NTs via a photoreduction process. The PEC activity of Pd/TiO 2 NTs was investigated by decomposition of methylene blue (MB) and Rhodamine B (RhB). Because of formation Schottky junctions between TiO 2 and Pd, which significantly promoted the electron transfer and reduced the recombination of photogenerated electrons and holes, the Pd/TiO 2 NT electrode showed significantly higher PEC activities than TiO 2 NTs. Interestingly, an obvious synergy between two dyes was observed and corresponding mechanism based on facilitated transfer of electrons and holes as a result of a suitable energy level alignment was suggested. The findings of this work provide a fundamental insight not only into the fabrication but also utility of Schottky junctions for enhanced environmental remediation processes. © 2012 American Chemical Society.en
dc.description.sponsorshipThis work was supported by KAUST baseline fund. We thank Dr. Lan Zhao, Dr. Bei Zhang, and Dr. Mohamed Nejib Hedhili from King Abdullah University of Science and Technology (KAUST) for their help with SEM, XRD, and XPS, respectively. Z.Z acknowledges a Sabic Postdoctoral Fellowship.en
dc.publisherAmerican Chemical Societyen
dc.subjectPd nanoparticlesen
dc.subjectphotoelectrocatalysisen
dc.subjectSchottsky junctionen
dc.subjectTiO 2 nanotubeen
dc.titleHierarchical top-porous/bottom-tubular TiO 2 nanostructures decorated with Pd nanoparticles for efficient photoelectrocatalytic decomposition of synergistic pollutantsen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentWater Desalination & Reuse Research Cntren
dc.contributor.departmentEnvironmental Nanotechnology Laben
dc.identifier.journalACS Applied Materials and Interfacesen
kaust.authorZhang, Zhonghaien
kaust.authorYu, Yanjieen
kaust.authorWang, Pengen
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