二氧化钛表面缺陷调控并负载微量铂用于光催化析氢
Regulation of Surface Defects and Loading of Trace Platinum over Titanium Dioxide for Photocatalytic Hydrogen Evolution
李三羊 1陈桂林 1陈明军 1闫俊青1
作者信息
- 1. 陕西师范大学材料科学与工程学院,西安 710062
- 折叠
摘要
通过调控表面缺陷、负载助催化剂可以有效提升TiO2的光催化性能.作者在氩氢混合气(5％H2)气氛下对TiO2进行煅烧操作,更改温度条件以进行表面缺陷调控.在此基础上,采用光沉积技术,以上述TiO2为基底负载微量Pt,得到高效光催化剂.经光催化分解水析氢测试,煅烧温度为300 ℃时,所得催化剂光催化性能最佳.煅烧温度上升一方面使TiO2表面缺陷增加,光生载流子的复合受到抑制,另一方面使其粒径增加,催化剂的比表面积下降.两种因素共同作用使样品的光催化性能呈现先上升后下降的趋势.在氙灯(AM1.5G)照射下,TiO2-H2-300的析氢速率达到1 607.84 μmol·g-1·h-1.
Abstract
Enhancing TiO2's photocatalytic performance is achievable through regulating surface defects and loading cocatalysts.This paper detailed the calcination process of TiO2 in the argon/hydrogen mixed atmosphere(5％H2),altering the temperature parameter to regulate surface defects.The mentioned TiO2 was loaded with trace Pt using photo-deposition technique to achieve efficient photocatalysts.The obtained catalysts were applied to the photocatalytic hydrogen evolution reaction.The results showed that the catalysts exhibited optimal photocatalytic efficiency when the calcination temperature was 300 ℃.Elevated calcination temperature led to more surface defects,restrained the recombination of photogenerated charge carriers,and,conversely,disrupted the initial bulk structure of TiO2.The simultaneous influence of the two factors led to a fluctuating trend in the photocatalytic efficiency of the samples,initially rising and subsequently falling.When exposed to a xenon lamp(AMI.5 G),the hydrogen evolution rate attained 1 607.84 pamol·g-1·h-1.
关键词
析氢反应/光催化分解水/表面缺陷/光沉积/二氧化钛Key words
hydrogen evolution reaction/photocatalytic water splitting/surface defect/photo-deposition/titanium dioxide引用本文复制引用
出版年
2024
NETL
NSTL
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