双金属粒子在光-氢转换中的作用分析  

The Role of Bimetallic Nanoparticles in Solar Hydrogen Production

作　　者：雷蕾[1] 桑丽霞[1] LEI Lei;SANG Lixia(Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Ministry of Education,Key Laboratory of Heat Transfer and Energy Conservation,Beijing Municipality,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学,传热强化与过程节能教育部重点实验室,传热与能源利用北京市重点实验室,北京100124

出　　处：《工程热物理学报》2023年第3期600-607,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376013,No.51776009)。

摘　　要：本文采用两步阳极氧化法在TiO_(2)纳米环/管阵列表面负载Ag、Cu纳米粒子,与单金属修饰样品对比分析得到双金属对TiO_(2)光电响应和电极/电解液界面性质的影响。同时,XPS、UV-Vis和U-t测试表明AgCu-TiO_(2)光阳极金属抗氧化性强、可见光吸收好、光生电子寿命长,光电流密度达0.76 mA·cm^(-2),对应产氢速率376μL·h^(-1)·cm^(-2)。对AgCu-TiO_(2)/H_(2)O、Ag-TiO_(2)/H_(2)O和Cu-TiO_(2)/H_(2)O体系进行分子动力学模拟计算,双金属体系相对较宽的耗尽层可促进光生电子-空穴分离、转移。最终结合热力学、动力学分析得到双金属修饰TiO_(2)光阳极的电子传输路径。The plasmonic AgCu-decorated TiO_(2) nanoring/nanotube arrays photoanode was synthesized by using two-step anodization,and the effect of bimetallc AgCu on the photoelectrochemical response of TiO_(2) and the interface properties were obtained by comparing with monometallic Ag,Cu decorated TiO_(2).With greater visible light absorption,longer carriers’lifetime and stronger chemical stability,AgCu-TiO_(2) photoanode shows the photocurrent density of 0.76 mA cm^(-2) and stable H_(2) production rate of 376μL·h^(-1)·cm^(-2).Thereafter,the electrostatic properties of the AgCu-TiO_(2)/H_(2)O,Ag-TiO_(2)/H_(2)O and Cu-TiO_(2)/H_(2)O systems were simulated by using molecular dynamics simulations.It is found that the bimetallic AgCu-TiO_(2)/H_(2)O system has a wider depletion layer,which helps to the separation and transfer of photogenerated electrons and holes.Based on the thermodynamic and kinetic analyses,the carriers’transport pathways were obtained.

关 键 词：光解水 TiO_(2)纳米环/管阵列 双金属AgCu 界面静电特性 耗尽层 

分 类 号：TK91[动力工程及工程热物理]