二氧化钛表面缺陷调控并负载微量铂用于光催化析氢

DOI: 10.16597/j.cnki.issn.1002-154x.2024.06.003

作者： 李三羊，陈桂林，陈明军，闫俊青

单位： 陕西师范大学材料科学与工程学院，西安 710062

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1607.84 μmol·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

Authors: LI Sanyang, CHEN Guilin, CHEN Mingjun, YAN Junqing

Affiliation: School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, China

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 the 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 (AM1.5G), the hydrogen evolution rate attained 1607.84 μmol·g⁻¹·h⁻¹.

Keywords: hydrogen evolution reaction, photocatalytic water splitting, surface defect, photo-deposition, titanium dioxide