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Fully Depleted Ti-Nb-Ta-Zr-O Nanotubes: Interfacial Charge Dynamics and Solar Hydrogen Production.
Chiu, Yi-Hsuan; Lai, Ting-Hsuan; Chen, Chun-Yi; Hsieh, Ping-Yen; Ozasa, Kazunari; Niinomi, Mitsuo; Okada, Kiyoshi; Chang, Tso-Fu Mark; Matsushita, Nobuhiro; Sone, Masato; Hsu, Yung-Jung.
Afiliación
  • Chiu YH; Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan.
  • Lai TH; Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan.
  • Chen CY; Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan.
  • Hsieh PY; Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan.
  • Ozasa K; CREST, Japan Science and Technology Agency , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan.
  • Niinomi M; Department of Materials Science and Engineering , National Chiao Tung University , Hsinchu 30010 , Taiwan.
  • Okada K; Bioengineering Lab, RIKEN , 2-1 Hirosawa , Wako, Saitama 351-0198 , Japan.
  • Chang TM; Institute for Materials Research , Tohoku University , 2-1-1 Katahira , Aoba-ku, Sendai 980-8577 , Japan.
  • Matsushita N; Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan.
  • Sone M; Institute of Innovative Research , Tokyo Institute of Technology , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan.
  • Hsu YJ; CREST, Japan Science and Technology Agency , 4259 Nagatsuta-cho , Midori-ku, Yokohama 226-8503 , Japan.
ACS Appl Mater Interfaces ; 10(27): 22997-23008, 2018 Jul 11.
Article en En | MEDLINE | ID: mdl-29664283
ABSTRACT
Poor kinetics of hole transportation at the electrode/electrolyte interface is regarded as a primary cause for the mediocre performance of n-type TiO2 photoelectrodes. By adopting nanotubes as the electrode backbone, light absorption and carrier collection can be spatially decoupled, allowing n-type TiO2, with its short hole diffusion length, to maximize the use of the available photoexcited charge carriers during operation in photoelectrochemical (PEC) water splitting. Here, we presented a delicate electrochemical anodization process for the preparation of quaternary Ti-Nb-Ta-Zr-O mixed-oxide (denoted as TNTZO) nanotube arrays and demonstrated their utility in PEC water splitting. The charge-transfer dynamics for the electrodes was investigated using time-resolved photoluminescence, electrochemical impedance spectroscopy, and the decay of open-circuit voltage analysis. Data reveal that the superior photoactivity of TNTZO over pristine TiO2 originated from the introduction of Nd, Ta, and Zr elements, which enhanced the amount of accessible charge carriers, modified the electronic structure, and improved the hole injection kinetics for expediting water splitting. By modulating the water content of the electrolyte employed in the anodization process, the wall thickness of the grown TNTZO nanotubes can be reduced to a size smaller than that of the depletion layer thickness, realizing a fully depleted state for charge carriers to further advance the PEC performance. Hydrogen evolution tests demonstrate the practical efficacy of TNTZO for realizing solar hydrogen production. Furthermore, with the composition complexity and fully depleted band structure, the present TNTZO nanotube arrays may offer a feasible and universal platform for the loading of other semiconductors to construct a sophisticated heterostructure photoelectrode paradigm, in which the photoexcited charge carriers can be entirely utilized for efficient solar-to-fuel conversion.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Asunto de la revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Año: 2018 Tipo del documento: Article País de afiliación: Taiwán

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Asunto de la revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Año: 2018 Tipo del documento: Article País de afiliación: Taiwán
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