Roles of oxygen vacancies in surface plasmon resonance photoelectrocatalytic water oxidation

被引：5

作者：

Li, Hao ^{[1
,2
]}

Wang, Shengyang ^{[1
]}

Tang, Jianbo ^{[2
,3
]}

Xie, Huichen ^{[1
,2
]}

Ma, Jiangping ^{[1
,4
,5
,6
]}

Chi, Haibo ^{[1
,7
]}

Li, Can ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian Natl Lab Clean Energy, 457 Zhongshan Rd, Dalian 116023, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, State Key Lab Mol React Dynam, 457 Zhongshan Rd, Dalian 116023, Peoples R China

[4] Chinese Acad Sci, Dalian Inst Chem Phys, Dynam Res Ctr Energy & Environm Mat, 457 Zhongshan Rd, Dalian 116023, Peoples R China

[5] Key Lab Adv Catalysis, Lanzhou 730000, Gansu, Peoples R China

[6] Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou 730000, Peoples R China

[7] Univ Sci & Technol China, Sch Chem & Mat Sci, Hefei 230026, Anhui, Peoples R China

来源：

CELL REPORTS PHYSICAL SCIENCE | 2023年 / 4卷 / 05期

基金：

中国国家自然科学基金;

关键词：

SOLAR; DYNAMICS; ENHANCEMENT; ARRAYS;

D O I：

10.1016/j.xcrp.2023.101386

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The extremely short lifetime of plasmon-induced charges is a huge chal-lenge 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 elec-trons 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 syn-chronous functions in hole capture and water molecule adsorption enable VO to be efficient catalytic sites for plasmon-induced water oxidation.

引用

页数：15