激光刻蚀缺陷增强Pt/TiO_(2)光催化还原CO_(2)性能的实验研究  

Experimental Study on Laser-Etching-Induced Defects in Pt/TiO_(2)for Enhanced Photocatalytic Reduction of CO_(2)

作　　者：张文斐 张元 周屈兰[1] 李娜[1] 刘东霞 ZHANG Wenfei;ZHANG Yuan;ZHOU Qulan;LI Na;LIU Dongxia(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Department of Chemical and Biomolecular Engineering,University of Maryland,College Park 20742,USA)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]马里兰大学化学与生物分子工程系,20742,美国大学公园市

出　　处：《西安交通大学学报》2024年第10期199-211,共13页Journal of Xi'an Jiaotong University

基　　金：陕西省科技计划资助项目(2020JM-081);美国能源部科学办公室能源创新催化中心资助项目(DESC0001004)。

摘　　要：针对二氧化钛(TiO_(2))在光催化反应中光响应能力差、光生载流子易复合等问题,采用激光刻蚀方法对锐钛矿TiO_(2)进行改性,并对其由于激光刻蚀造成的结构和性质变化,以及Pt负载后的金属-载体相互作用特征进行研究。实验结果表明:激光刻蚀导致锐钛矿TiO_(2)的晶粒尺寸增大,形成金红石相,并在TiO_(2)中产生了氧空位(O_(v))和Ti^(3+)缺陷,导致其带隙缩小以及对可见光的响应增强;与原始TiO_(2)中存在的缺陷相比,激光刻蚀诱导的缺陷更稳定,还原性更强,因而以缺陷型TiO_(2)作为载体制备的缺陷型Pt/TiO_(2)催化剂中的金属-载体相互作用也更剧烈,具有更强的电子转移能力和载流子分离性能,在光催化还原二氧化碳(CO_(2))过程中表现出极佳的反应活性和产物选择性。该结果可为激光刻蚀催化剂载体及催化剂在光催化中的材料特性和催化应用研究提供理论支持。To address the issues of poor light responsiveness and easy recombination of photogenerated carriers in titanium dioxide(TiO_(2))during photocatalytic reactions,laser etching is employed to modify TiO_(2).The study investigates the resulting structural and property changes induced by laser etching,as well as the characteristics of metal-support interactions after Pt loading.The experimental results demonstrate that laser etching leads to an increase in grain size of TiO_(2)and the formation of a rutile phase.Additionally,it causes oxygen vacancies(O_(v))and Ti^(3+)defects,leading to a reduced band gap and enhanced visible light response of TiO_(2).In comparison to the defects present in the original TiO_(2),the defects induced by laser etching exhibit greater stability and stronger reducibility.Consequently,the metal-support interaction in defective Pt/TiO_(2)catalysts,prepared using defective TiO_(2)as the support,is more pronounced,showcasing superior electron transfer capability and carrier separation performance.These catalysts demonstrate excellent reactivity and selectivity in the photocatalytic reduction of carbon dioxide(CO_(2)).The findings of this study provide theoretical support for understanding the material characteristics and catalytic applications of laser-etching-induced catalyst supports and catalysts in the field of photocatalysis.

关 键 词：激光刻蚀 二氧化钛 载体缺陷 金属-载体相互作用 二氧化碳 光催化 

分 类 号：TQ134.11[化学工程—无机化工] TB333[一般工业技术—材料科学与工程]