Boosting photocatalytic water oxidation by surface plasmon resonance of AgxAu1-x alloy nanoparticles

被引：70

作者：

Haider, Rida Shahzadi ^{[1
,3
]}

Wang, Shengyang ^{[1
]}

Gao, Yuying ^{[1
,3
]}

Malik, Anum Shahid ^{[1
,3
]}

Ta, Na ^{[1
]}

Li, Hao ^{[1
,3
]}

Zeng, Bin ^{[1
,3
]}

Dupuis, Michel ^{[1
,2
]}

Fan, Fengtao ^{[1
]}

Li, Can ^{[1
,3
]}

机构：

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

[2] Univ Buffalo State Univ New York, Dept Chem & Biol Engn, Buffalo, NY 14260 USA

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

来源：

NANO ENERGY | 2021年 / 87卷

基金：

中国国家自然科学基金;

关键词：

Plasmonic-photocatalyst; Metal alloy; Water oxidation; CORE-SHELL NANOPARTICLES; SILVER NANOPARTICLES; HOT-CARRIER; ENERGY-TRANSFER; AG; AU; GOLD; METAL; TIO2; GENERATION;

D O I：

10.1016/j.nanoen.2021.106189

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Surface plasmon resonance (SPR) induced photocatalysis with multi-metallic nanoparticles stays indistinct, especially in photo-induced water oxidation reaction. Herein, we report a strategy of engineering band structure by noble metal alloying (AgxAu1-x). The modulated composition of AgAu alloy nanoparticles loaded on rutile TiO2 to selectively tune SPR wavelengths and d-band position. We found that SPR-induced water oxidation activity varies as a function of the ratio of Au and Ag in AgxAu1-x/TiO2 photocatalysts, exhibiting"volcano-like" relationship between the oxygen evolution production rate and the metal-composition. The Ag0.6Au0.4/TiO2 photocatalyst shows superior water oxidation performance about 3-folds of individual Ag and Au. Photoemission spectra (PES) of alloy are in correlation with density of states, revealing the sensitivity of d-band onset energies and SPR excitation wavelengths. Furthermore, surface-photovoltage (SPV) response of alloy signifies the superiority of alloy in interfacial charge separation of hot carriers. Density functional theory (DFT) calculations validate the experimental results by revealing complex AgAu alloy-semiconductor (Ti-O-Au-Ag) for oxygen evolution along with electrodynamic simulations to trace distribution of electric-field components. This work demonstrates critical role of d-band tuning across alloy composition for boosting catalytic fraction through the integrated effects of light absorption, Schottky barrier height and d-band position of the plasmonic photocatalysts.

引用

页数：10

共 56 条

[1] Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag-Au/polytetrafluoroethylene nanocomposites [J].