One-Dimensional CdS/SrTiO3/Carbon Fiber Core–Shell Photocatalysts for Enhanced Photocatalytic Hydrogen Evolution

Abstract

The photocatalytic hydrogen production efficiency of a single SrTiO3 photocatalytic catalyst is often low, which is mainly due to the serious combination of electrons and holes produced by photocatalysis as well as the mismatch of the redox capacity and light absorption range. Construction of semiconductor heterojunctions can solve these problems. CdS has a narrow band gap, which can effectively utilize visible light, and it has a band structure matched with that of SrTiO3. Therefore, CdS is considered as an ideal candidate for constructing heterojunctions with SrTiO3. In this paper, bamboo pulp fibers were used as the substrate, and SrTiO3 was coated on the substrate through the solvothermal process. CF/SrTiO3 rich in oxygen vacancies was formed by high temperature carbonization, and heterojunctions were formed by loading CdS on the surface of the CF/SrTiO3 composite material through the hydrothermal method, thus obtaining one-dimensional CF/SrTiO3/CdS core–shell photocatalysts. The structure and photocatalytic hydrogen production performance of the CF/SrTiO3/CdS core–shell photocatalysts were mainly studied. The photocatalytic hydrogen production experiment showed that the hydrogen production rate of the CF/SrTiO3/CdS-2 sample under the optimized process was as high as 577.39 μmol/g·h, which was about 11 times that of the CF/SrTiO3 sample. In this composite photocatalytic material system, the loading of the CdS nanospheres could enhance the visible light absorption capacity of the composite catalyst, promote the rapid separation and high-speed migration of photocarriers, and significantly improve the photocatalytic activity.

Facile Fabrication of SrTiO3/In2O3 on Carbon Fibers via a Self-Assembly Strategy for Enhanced Photocatalytic Hydrogen Production

“…The CF/SrTiO 3 composite fiber, featuring a core-shell heterojunction structure, was prepared using the method outlined in previous studies [10,11]. Generally, this involves coating a SrTiO 3 nanolayer onto Tencel fibers via the solvothermal method at 180 • C for 7 h, followed by carbonizing the fibers at 800 • C for 2 h under nitrogen to form CF/SrTiO 3 .…”

“…Na 2 S and Na 2 SO 3 served as sacrificial agents, and the reaction took place in 100 mL of aqueous solution. A 300 W xenon lamp (PLS-SE300C, Beijing perfectlight Co., Ltd., Beijing, China) was utilized to simulate sunlight [10,11].…”

“…In addition, its excellent conductivity enhances the rapid transfer of photogenerated electrons, improving photocatalytic performance. In previous studies, we successfully synthesized CF/SrTiO 3 composite fiber materials and demonstrated that doping with Mn or incorporating CdS enhances light absorption and photogenerated electron transport, thereby improving the photocatalytic performance and facilitating the recyclability of the composite [10,11]. In this work, CF/SrTiO 3 composite fiber material was employed as a substrate for the initial deposition of In seeds.…”