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Electrochemical hydrogenation of mixed-phase TiO₂ nanotube arrays enables remarkably enhanced photoelectrochemical water splitting performance

Liu, Jiaqin; Dai, Mengjia; Wu, Jian; Hu, Ying; Zhang, Qi; Cui, Jiewu; Wang, Yan; Tan, Hark Hoe; Wu, Yucheng

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We first report that photoelectrochemical (PEC) performance of electrochemically hydrogenated TiO2 nanotube arrays (TNTAs) as high-efficiency photoanodes for solar water splitting could be well tuned by designing and adjusting the phase structure and composition of TNTAs. Among various TNTAs annealed at different temperature ranging from 300 to 700 °C, well-crystallized single anatase (A) phase TNTAs-400 photoanode shows the best photoresponse properties and PEC performance due to the favorable...[Show more]

dc.contributor.authorLiu, Jiaqin
dc.contributor.authorDai, Mengjia
dc.contributor.authorWu, Jian
dc.contributor.authorHu, Ying
dc.contributor.authorZhang, Qi
dc.contributor.authorCui, Jiewu
dc.contributor.authorWang, Yan
dc.contributor.authorTan, Hark Hoe
dc.contributor.authorWu, Yucheng
dc.date.accessioned2018-01-22T03:46:16Z
dc.identifier.issn2095-9273
dc.identifier.urihttp://hdl.handle.net/1885/139538
dc.description.abstractWe first report that photoelectrochemical (PEC) performance of electrochemically hydrogenated TiO2 nanotube arrays (TNTAs) as high-efficiency photoanodes for solar water splitting could be well tuned by designing and adjusting the phase structure and composition of TNTAs. Among various TNTAs annealed at different temperature ranging from 300 to 700 °C, well-crystallized single anatase (A) phase TNTAs-400 photoanode shows the best photoresponse properties and PEC performance due to the favorable crystallinity, grain size and tubular structures. After electrochemical hydrogenation (EH), anatase-rutile (A-R) mixed phase EH-TNTAs-600 photoanode exhibits the highest photoactivity and PEC performance for solar water splitting. Under simulated solar illumination, EH-TNTAs-600 achieves the best photoconversion efficiency of up to 1.52% and maximum H2 generation rate of 40.4 µmol h−1 cm−2, outstripping other EH-TNTAs photoanodes. Systematic studies reveal that the signigicantly enhanced PEC performance for A-R mixed phaes EH-TNTAs-600 photoanode could be attributed to the synergy of A-R mixed phases and intentionally introduced Ti3+ (oxygen vacancies) which enhances the photoactivity over both UV and visible-light regions, and boosts both charge separation and transfer efficiencies. These findings provide new insight and guidelines for the construction of highly efficient TiO2-based devices for the application of solar water splitting.
dc.description.sponsorshipThis work was supported by the National Natural Science Foundation of China (51402078, 21702041, and 11674354), the National Basic Research Program of China (2014CB660815), and the Fundamental Research Funds for the Central Universities (JZ2016HGTB0711, JZ2016HGTB0719, and JZ2017HGPA0167).
dc.format.mimetypeapplication/pdf
dc.publisherElsevier
dc.rights© 2017 Elsevier.
dc.sourceScience Bulletin
dc.titleElectrochemical hydrogenation of mixed-phase TiO₂ nanotube arrays enables remarkably enhanced photoelectrochemical water splitting performance
dc.typeJournal article
dc.date.issued2017
local.publisher.urlhttps://www.elsevier.com/
local.type.statusAccepted Version
local.contributor.affiliationTan, H. H., Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University
local.identifier.doi10.1016/j.scib.2017.12.023
dcterms.accessRightsOpen Access
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/2095-9273/..."Author's post-print on open access repository after an embargo period of between 12 months and 48 months" from SHERPA/RoMEO site (as at 22/01/18).
CollectionsANU Research Publications

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