Defect-induced ordered mesoporous titania molecular sieves: a enique and highly efficient hetero-phase photocatalyst for solar hydrogen generation

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dc.contributor.authorGupta, Sen_AU
dc.contributor.authorVatti, SKen_AU
dc.contributor.authorGu, QFen_AU
dc.contributor.authorWagh, Den_AU
dc.contributor.authorManyar, Hen_AU
dc.contributor.authorSelvam, Pen_AU
dc.date.accessioned2025-07-18T03:53:31Zen_AU
dc.date.available2025-07-18T03:53:31Zen_AU
dc.date.issued2023-08-25en_AU
dc.date.statistics2025-07-18en_AU
dc.description.abstractThe conversion of solar energy into fuel has gained significant interest, particularly in photocatalytic water splitting, and the materials that efficiently generate hydrogen from water or aqueous solution using solar irradiation are highly desired for the hydrogen economy. Photocatalysts made of N‐doped TiO2 are frequently utilized for breaking of water molecules in the process of generating hydrogen. To achieve this target, a unique defect‐induced nitrogen‐doped highly organized 2D‐hexagonal periodic mesoporous titania, TiO2‐xNy with a well‐crystallized framework is synthesized in a reproducible way using structure‐directing agents, e. g., F108, F127, P123, and CTAB. The nitrogen is incorporated into these samples through a facile method involving the calcination of templated materials in an air. A systematic characterization of the resulting ordered mesoporous titania employing a battery of experimental techniques indicates the presence of considerable amounts of intrinsic defects, viz., trapped electrons in oxygen vacancy and/or Ti3+ centres via nitrogen‐doping in the titania matrix. These defects in turn promote the charge separation of photogenerated excitons, and therefore exhibit excellent photocatalytic activity for the hydrogen evolution reaction as compared to commercial titania such as Aeroxide®P‐25. The superior activity of the N‐doped mesoporous TiO2 is attributed to the synergistic effect of facile charge migration with high carrier density, unique phase composition (bronze and anatase), slow recombination of photo‐induced excitons, and enhanced absorbance from ultra‐violet to the visible region. © 1999-2025 John Wiley & Sons, Inc or related companiesen_AU
dc.description.sponsorshipThe authors thank the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), New Delhi for funding NCCR, IIT-Madras under grant No. IR/S1/CU-01/2002; Professor B. Viswanathan, Professor Shinya Hayami and Professor Dionisios Vlachos for their encouragement and support. Dr. R. Pavul Raj is gratefully acknowledged for his help in the electrochemical measurements, analysis, and fruitful discussion. We are also grateful to Professor Yusuke Yamauchi and Professor Yusuke Asakura for the careful reading of the manuscript and valuable suggestions. This work is supported by the grant-in-aid for scientific research on priority areas under the technology systems development programme – solar hydrogen (DST/TSG/SH/2011/106-G), and industrial research and development projects in the framework of the Indian-Hungarian Science and Technology Cooperation Programme under grant No. DST/INT/HUN/P-13/2017. PS and HM gratefully acknowledge Queen's University Belfast for providing the agility grant.en_AU
dc.identifier.articlenumbere202300319en_AU
dc.identifier.citationGupta, S., Vatti, S. K., Gu, Q., Wagh, D., Manyar, H., & Selvam, P. (2023). Defect-induced ordered mesoporous titania molecular sieves: a enique and highly efficient hetero-phase photocatalyst for solar hydrogen generation. ChemNanoMat, 9(12), e202300319. doi:10.1002/cnma.202300319en_AU
dc.identifier.issn2199-692Xen_AU
dc.identifier.issue12en_AU
dc.identifier.journaltitleChemNanoMaten_AU
dc.identifier.urihttps://doi.org/10.1002/cnma.202300319en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16308en_AU
dc.identifier.volume9en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherWileyen_AU
dc.subjectDefectsen_AU
dc.subjectPorous materialsen_AU
dc.subjectSolar energyen_AU
dc.subjectPhotocatalysisen_AU
dc.subjectDoped materialsen_AU
dc.subjectElectronsen_AU
dc.subjectOxygenen_AU
dc.subjectNitrogenen_AU
dc.subjectTitanium oxidesen_AU
dc.subjectHydrogenen_AU
dc.subjectVisible spectraen_AU
dc.titleDefect-induced ordered mesoporous titania molecular sieves: a enique and highly efficient hetero-phase photocatalyst for solar hydrogen generationen_AU
dc.typeJournal Articleen_AU
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