Kim, Moonsu ORCID: 0000-0002-2395-9308, Lee, Jaewon, Je, Minyeong, Heo, Bumgi, Yoo, Hyeonseok, Choi, Heechae ORCID: 0000-0002-9390-6607, Choi, Jinsub ORCID: 0000-0003-1675-7318 and Lee, Kiyoung ORCID: 0000-0003-2432-6614 (2021). Electric field-driven one-step formation of vertical p-n junction TiO2 nanotubes exhibiting strong photocatalytic hydrogen production. J. Mater. Chem. A, 9 (4). S. 2239 - 2248. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2050-7496

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Abstract

In this study, vertically aligned p-n junction TiO2 nanotubes can be formed by anodization of the Ti substrate following the addition of a high electric field in a Pd precursor-containing electrolyte. The bottom region of the TiO2 nanotubes with a high concentration of Pd because of the high electric field which was induced to be p-type. In contrast, the region with a low Pd concentration (top of the TiO2 nanotubes) was determined to be n-type, similar to the pristine TiO2. The concentration profile of the dopant in TiO2 nanotubes was investigated via TOF-SIMS and XPS. Defect formation energies in TiO2 nanotubes were estimated using density-functional theory calculation to understand the p-n junction formation. The p-n junction TiO2 nanotubes showed a high photocatalytic hydrogen production rate of 25.2 mu L cm(-2) h(-1) under solar light irradiation as a result of the enhancement of visible light photoactivity.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Kim, MoonsuUNSPECIFIEDorcid.org/0000-0002-2395-9308UNSPECIFIED
Lee, JaewonUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Je, MinyeongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heo, BumgiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yoo, HyeonseokUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Choi, HeechaeUNSPECIFIEDorcid.org/0000-0002-9390-6607UNSPECIFIED
Choi, JinsubUNSPECIFIEDorcid.org/0000-0003-1675-7318UNSPECIFIED
Lee, KiyoungUNSPECIFIEDorcid.org/0000-0003-2432-6614UNSPECIFIED
URN: urn:nbn:de:hbz:38-583070
DOI: 10.1039/d0ta10062e
Journal or Publication Title: J. Mater. Chem. A
Volume: 9
Number: 4
Page Range: S. 2239 - 2248
Date: 2021
Publisher: ROYAL SOC CHEMISTRY
Place of Publication: CAMBRIDGE
ISSN: 2050-7496
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
INTRINSIC AU-DECORATION; THIN-FILMS; HETEROJUNCTION; ANODIZATION; PERFORMANCE; FABRICATION; STABILITY; EVOLUTION; CATALYST; OXIDEMultiple languages
Chemistry, Physical; Energy & Fuels; Materials Science, MultidisciplinaryMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/58307

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