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Tungsten Oxide-Based Z-Scheme for Visible Light-Driven Hydrogen Production from Water Splitting

Thangamuthu, Madasamy; Vankayala, Kiran; Xiong, Lunqiao; Conroy, Stuart; Zhang, Xiaolei; Tang, Junwang; (2023) Tungsten Oxide-Based Z-Scheme for Visible Light-Driven Hydrogen Production from Water Splitting. ACS Catalysis , 13 (13) pp. 9113-9124. 10.1021/acscatal.3c01312. Green open access

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Abstract

The stoichiometric water splitting using a solar-driven Z-scheme approach is an emerging field of interest to address the increasing renewable energy demand and environmental concerns. So far, the reported Z-scheme must comprise two populations of photocatalysts. In the present work, only tungsten oxides are used to construct a robust Z-scheme system for complete visible-driven water splitting in both neutral and alkaline solutions, where sodium tungsten oxide bronze (Na0.56WO3–x) is used as a H2 evolution photocatalyst and two-dimensional (2D) tungsten trioxide (WO3) nanosheets as an O2 evolution photocatalyst. This system efficiently produces H2 (14 μmol h–1) and O2 (6.9 μmol h–1) at an ideal molar ratio of 2:1 in an aqueous solution driven by light, resulting in a remarkably high apparent quantum yield of 6.06% at 420 nm under neutral conditions. This exceptional selective H2 and O2 production is due to the preferential adsorption of iodide (I–) on Na0.56WO3–x and iodate (IO3–) on WO3, which is evidenced by both experiments and density functional theory calculation. The present liquid Z-scheme in the presence of efficient shuttle molecules promises a separated H2 and O2 evolution by applying a dual-bed particle suspension system, thus a safe photochemical process.

Type: Article
Title: Tungsten Oxide-Based Z-Scheme for Visible Light-Driven Hydrogen Production from Water Splitting
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/acscatal.3c01312
Publisher version: https://doi.org/10.1021/acscatal.3c01312
Language: English
Additional information: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: green hydrogen, tungsten oxide, Z-scheme, visible photocatalysis, water splitting, DFT calculation
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10173119
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