Jump to main content
Jump to site search

Issue 5, 2019
Previous Article Next Article

Enhanced light harvesting and charge separation over wormhole mesoporous TiO2−X nanocrystallites towards efficient hydrogen generation

Author affiliations

Abstract

Here meso-TiO2−X materials with combined visible light absorption, high surface area, an anatase–rutile heterojunction, and electrically interconnected nanocrystallites in a wormhole mesoporous framework are achieved. Meso-TiO2−X materials were prepared by solution combustion synthesis (SCS), followed by hydrogenation at higher temperatures. The materials are thoroughly characterised by various physicochemical techniques. A small band gap (2.8 eV), type IV-H2 mesoporosity with a biphasic heterojunction, and small pore depths (10 nm) in a wormhole mesoporous framework are observed with 35AP. Photocatalytic water splitting for hydrogen production and photocurrent generation were carried out with meso-TiO2−X materials under simulated sunlight. A six-fold increase in activity under AM 1.5G irradiation was observed, which is attributed to the generated mid-gap states which lead to band gap reduction, improved optical absorption in the visible and infrared light region resulting in higher charge carrier density. The presence of a biphasic heterojunction between the (1 0 1) anatase and (1 1 0) rutile facets assists in effective charge separation. A low charge diffusional constraint associated with wormhole mesoporosity helps in facile charge transport to the surface for improved charge utilisation in redox reactions.

Graphical abstract: Enhanced light harvesting and charge separation over wormhole mesoporous TiO2−X nanocrystallites towards efficient hydrogen generation

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Nov 2018, accepted on 28 Mar 2019 and first published on 29 Mar 2019


Article type: Paper
DOI: 10.1039/C8SE00580J
Citation: Sustainable Energy Fuels, 2019,3, 1191-1200

  •   Request permissions

    Enhanced light harvesting and charge separation over wormhole mesoporous TiO2−X nanocrystallites towards efficient hydrogen generation

    S. S. Negi, Sustainable Energy Fuels, 2019, 3, 1191
    DOI: 10.1039/C8SE00580J

Search articles by author

Spotlight

Advertisements