Roles of oxygen vacancies in surface plasmon resonance photoelectrocatalytic water oxidation

The extremely short lifetime of plasmon-induced charges is a huge challenge to surface plasmon resonance photocatalytic water oxidation. Here, we report that increasing oxygen vacancies (VO) in Au/TiO2-x can greatly enhance the external quantum efficiency of plasmon-induced water oxidation from 0.03...

Full description

Saved in:
Bibliographic Details
Published in:Cell reports physical science 2023-05, Vol.4 (5), p.101386, Article 101386
Main Authors: Li, Hao, Wang, Shengyang, Tang, Jianbo, Xie, Huichen, Ma, Jiangping, Chi, Haibo, Li, Can
Format: Article
Language:English
Subjects:
oxygen vacancies
photoelectrocatalysis
surface plasmon resonance
water oxidation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The extremely short lifetime of plasmon-induced charges is a huge challenge to surface plasmon resonance photocatalytic water oxidation. Here, we report that increasing oxygen vacancies (VO) in Au/TiO2-x can greatly enhance the external quantum efficiency of plasmon-induced water oxidation from 0.03% to 1.52% at 520 nm. The increased VO can achieve efficient transportation of plasmonic electrons in the conduction band of TiO2-x with enhanced conductivity and can boost the oxygen evolution kinetics of Au/TiO2-x. The dynamics of plasmonic electrons derived from interband transition reveal that holes in the d-band of Au nanoparticles (NPs) can transfer to the defect states near the valence band of TiO2-x, which originate from VO at the interface of Au/TiO2-x. This process could enrich holes at the interface, making it possible to collect multiple holes for water oxidation. The synchronous functions in hole capture and water molecule adsorption enable VO to be efficient catalytic sites for plasmon-induced water oxidation. [Display omitted] •1.52% quantum efficiency of SPR-induced water oxidation achieved by Au/TiO2-x•Enhanced interface plasmonic charge separation and surface oxygen evolution kinetics•Synchronous functions of oxygen vacancies in hole capture and water adsorption Li et al. report that oxygen vacancies (VO) in Au/TiO2 enhance SPR photoelectrocatalytic water oxidation efficiency from 0.03% to 1.52%. In addition to promoting interfacial charge separation, VO could work as efficient catalytic sites for plasmon-induced water oxidation owing to synchronous functions in hole capture and water adsorption.
ISSN:2666-3864
2666-3864
DOI:10.1016/j.xcrp.2023.101386