Microwave-assisted self-doping of TiO2 photonic crystals for efficient photoelectrochemical water splitting

Handle URI:
http://hdl.handle.net/10754/563333
Title:
Microwave-assisted self-doping of TiO2 photonic crystals for efficient photoelectrochemical water splitting
Authors:
Zhang, Zhonghai; Yang, Xiulin; Hedhili, Mohamed N. ( 0000-0002-3624-036X ) ; Ahmed, Elaf S.; Shi, Le; Wang, Peng
Abstract:
In this article, we report that the combination of microwave heating and ethylene glycol, a mild reducing agent, can induce Ti3+ self-doping in TiO2. A hierarchical TiO2 nanotube array with the top layer serving as TiO2 photonic crystals (TiO2 NTPCs) was selected as the base photoelectrode. The self-doped TiO2 NTPCs demonstrated a 10-fold increase in visible-light photocurrent density compared to the nondoped one, and the optimized saturation photocurrent density under simulated AM 1.5G illumination was identified to be 2.5 mA cm-2 at 1.23 V versus reversible hydrogen electrode, which is comparable to the highest values ever reported for TiO2-based photoelectrodes. The significant enhancement of photoelectrochemical performance can be ascribed to the rational coupling of morphological and electronic features of the self-doped TiO 2 NTPCs: (1) the periodically morphological structure of the photonic crystal layer traps broadband visible light, (2) the electronic interband state induced from self-doping of Ti3+ can be excited in the visible-light region, and (3) the captured light by the photonic crystal layer is absorbed by the self-doped interbands. © 2013 American Chemical Society.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC); Advanced Nanofabrication, Imaging and Characterization Core Lab; Core Labs
Publisher:
American Chemical Society (ACS)
Journal:
ACS Applied Materials & Interfaces
Issue Date:
8-Jan-2014
DOI:
10.1021/am404848n
Type:
Article
ISSN:
19448244
Sponsors:
This work was supported by KAUST baseline fund. Z.Z. is thankful for a SABIC Postdoctoral Fellowship.
Appears in Collections:
Articles; Environmental Science and Engineering Program; Advanced Nanofabrication, Imaging and Characterization Core Lab; 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.authorYang, Xiulinen
dc.contributor.authorHedhili, Mohamed N.en
dc.contributor.authorAhmed, Elaf S.en
dc.contributor.authorShi, Leen
dc.contributor.authorWang, Pengen
dc.date.accessioned2015-08-03T11:45:59Zen
dc.date.available2015-08-03T11:45:59Zen
dc.date.issued2014-01-08en
dc.identifier.issn19448244en
dc.identifier.doi10.1021/am404848nen
dc.identifier.urihttp://hdl.handle.net/10754/563333en
dc.description.abstractIn this article, we report that the combination of microwave heating and ethylene glycol, a mild reducing agent, can induce Ti3+ self-doping in TiO2. A hierarchical TiO2 nanotube array with the top layer serving as TiO2 photonic crystals (TiO2 NTPCs) was selected as the base photoelectrode. The self-doped TiO2 NTPCs demonstrated a 10-fold increase in visible-light photocurrent density compared to the nondoped one, and the optimized saturation photocurrent density under simulated AM 1.5G illumination was identified to be 2.5 mA cm-2 at 1.23 V versus reversible hydrogen electrode, which is comparable to the highest values ever reported for TiO2-based photoelectrodes. The significant enhancement of photoelectrochemical performance can be ascribed to the rational coupling of morphological and electronic features of the self-doped TiO 2 NTPCs: (1) the periodically morphological structure of the photonic crystal layer traps broadband visible light, (2) the electronic interband state induced from self-doping of Ti3+ can be excited in the visible-light region, and (3) the captured light by the photonic crystal layer is absorbed by the self-doped interbands. © 2013 American Chemical Society.en
dc.description.sponsorshipThis work was supported by KAUST baseline fund. Z.Z. is thankful for a SABIC Postdoctoral Fellowship.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectphotoelectrochemicalen
dc.subjectphotonic crystalen
dc.subjectself-dopingen
dc.subjectTiO2 nanotubeen
dc.subjectwater splittingen
dc.titleMicrowave-assisted self-doping of TiO2 photonic crystals for efficient photoelectrochemical water splittingen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentCore Labsen
dc.identifier.journalACS Applied Materials & Interfacesen
kaust.authorHedhili, Mohamed N.en
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