Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5437850 | Ceramics International | 2017 | 26 Pages |
Abstract
Photocatalytic hydrogen production attracts great attention due to its clean energy conversion and renewable usage. In order to achieve efficient charge separations in photocatalysts, pseudo-microspherical ZnO/CdS core-shell structures were fabricated by precipitation method. ZnO pseudo-microspheres of about 2 µm diameter were uniformly synthesized, and they were used as core materials covered with various amounts of CdS shell nanoparticles. The highest hydrogen production rate from as-prepared photocatalysts was 146 μmol gâ1 hâ1 at 63 wt% CdS content under one sun irradiation condition. After thermal treatments, it was much improved to 241.2 μmol gâ1 hâ1 at the same CdS content possibly due to the increased crystallinity and efficient charge flows with an aid of additional CdO component. Reproducibility of hydrogen production revealed stable mode of operation for three consecutive runs. Therefore, ZnO/CdS/CdO ternary photocatalyst systems provide efficient charge separations and electron flows for improving solar hydrogen production by suppressing electron-hole recombinations.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Daegil Bak, Jung Hyeun Kim,