Ag与Ag2O协同增强TiO2光催化制氢性能的研究  

Synergistic Effect of Ag and Ag2O on Photocatalytic H2-evolution Performance of TiO2

作　　者：王苹 李心宇 时占领 李海涛 WANG Ping;LI Xinyu;SHI Zhanling;LI Haitao(School of Chemistry,Chemical Engineering and Life Science,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学化学化工与生命科学学院,武汉430070

出　　处：《无机材料学报》2020年第7期781-788,共8页Journal of Inorganic Materials

基　　金：国家自然科学基金(51872221);国家级大学生创新创业训练计划项目(20181049715025)。

摘　　要：本研究采用两步法制备了电子助剂Ag和界面活性位点Ag2O共修饰的高效TiO2光催化剂(TiO2/Ag-Ag2O):首先用光沉积法将Ag负载在TiO2表面(TiO2/Ag),再经过低温煅烧法使部分Ag原位生成Ag2O。紫外光照射TiO2时,激发产生的电子被助剂Ag捕获后快速传输到Ag2O上,电子把Ag2O界面产氢活性位点从溶液中所捕获的氢离子还原成氢气, Ag和Ag2O的协同作用加快了TiO2上光生电子的转移和界面产氢反应,从而提高了TiO2/Ag-Ag2O制氢性能。在300℃煅烧温度下制备的TiO2/Ag-Ag2O光催化剂制氢速率最高,达到75.20μmol/h,分别是TiO2(3.59μmol/h)和TiO2/Ag(41.13μmol/h)的21.0倍和1.8倍。本研究为光催化制氢材料的设计和制备提供了有益的参考。Highly efficient TiO2 photocatalysts(TiO2/Ag-Ag2O)co-modified by Ag as electron cocatalysts and Ag2O as interfacial catalytic active sites were synthesized via a two-step process including the initial photoinduced deposition of metallic Ag nanoparticles on the TiO2 surface(TiO2/Ag)and the following in situ oxidation of partial Ag into Ag2O by low-temperature calcination.Ag nanoparticles function as effective electron cocatalysts for the steady capture and rapid transportation of photogenerated electrons from TiO2 surface to Ag2O,while the adsorbed H+ions from solution to Ag2O as the interfacial catalytic active sites are reduced into H2.The synergistic effect of Ag and Ag2O can accelerate the electrons transfer and promote the rapid H2-evolution reaction for enhanced photocatalytic H2-evolution performance of TiO2/Ag-Ag2O.The highest H2-evolution rate of the resultant TiO2/Ag-Ag2O calcinated at 300℃reached 75.20μmol/h,which was higher than those of the TiO2(3.59μmol/h)and TiO2/Ag(41.13μmol/h)by 21.0 and 1.8 times,respectively.This study provides a new strategy for the design and synthesis of highly efficient photocatalytic H2-evolution materials.

关 键 词：TIO2 电子助剂 界面活性位点 协同作用 光催化制氢 

分 类 号：O643[理学—物理化学]