Visible Light-Responsive CeO<sub>2</sub>/MoS<sub>2</sub> Composite for Photocatalytic Hydrogen Production
Semiconductor-based photocatalyst materials play an important role in solar hydrogen production. In the present work, we achieved the successful synthesis of a CeO<sub>2</sub>/MoS<sub>2</sub> composite using a facile hydrothermal method. For the preparation of the CeO<sub&...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-10-01
|
| Series: | Catalysts |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4344/12/10/1185 |
| _version_ | 1797474458122846208 |
|---|---|
| author | Anuja A. Yadav Yuvaraj M. Hunge Seok-Won Kang |
| author_facet | Anuja A. Yadav Yuvaraj M. Hunge Seok-Won Kang |
| author_sort | Anuja A. Yadav |
| collection | DOAJ |
| description | Semiconductor-based photocatalyst materials play an important role in solar hydrogen production. In the present work, we achieved the successful synthesis of a CeO<sub>2</sub>/MoS<sub>2</sub> composite using a facile hydrothermal method. For the preparation of the CeO<sub>2</sub>/MoS<sub>2</sub> composite, the hydrothermal process was carried out at a temperature of 120 °C for 24 h, and its performance in hydrogen production was tested. The CeO<sub>2</sub>/MoS<sub>2</sub> composite was characterized using XRD, XPS, Raman spectroscopy, SEM, and optical investigation. The optical study showed that after forming a composite with MoS<sub>2</sub>, the absorption edge of CeO<sub>2</sub> is shifted from the ultraviolet to the visible light region. Bandgap values decreased from 2.93 for CeO<sub>2</sub> to 2.34 eV for the CeO<sub>2</sub>/MoS<sub>2</sub> composite. In photocatalytic hydrogen production, Na<sub>2</sub>SO<sub>3</sub>–Na<sub>2</sub>S was used as a sacrificial agent. The CeO<sub>2</sub>/MoS<sub>2</sub> composite exhibited superior photocatalytic hydrogen production performance compared to CeO<sub>2</sub> and MoS<sub>2</sub>. The CeO<sub>2</sub>/MoS<sub>2</sub> composite achieved higher charge separation efficiency, faster charge transfer, more active sites available for redox reactions, and greater affinity towards the reactant ions due to such properties its hydrogen evolution rate has reached 112.5 μmol/h. The photostability of the CeO<sub>2</sub>/MoS<sub>2</sub> composite was tested in up to four cycles, with each cycle being four hours. |
| first_indexed | 2024-03-09T20:30:22Z |
| format | Article |
| id | doaj.art-ac8f5071cfe94c6fabd7ab21b78eabcf |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T20:30:22Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-ac8f5071cfe94c6fabd7ab21b78eabcf2023-11-23T23:25:04ZengMDPI AGCatalysts2073-43442022-10-011210118510.3390/catal12101185Visible Light-Responsive CeO<sub>2</sub>/MoS<sub>2</sub> Composite for Photocatalytic Hydrogen ProductionAnuja A. Yadav0Yuvaraj M. Hunge1Seok-Won Kang2Department of Automotive Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan 38541, KoreaDivision of Biotechnology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, KoreaDepartment of Automotive Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan 38541, KoreaSemiconductor-based photocatalyst materials play an important role in solar hydrogen production. In the present work, we achieved the successful synthesis of a CeO<sub>2</sub>/MoS<sub>2</sub> composite using a facile hydrothermal method. For the preparation of the CeO<sub>2</sub>/MoS<sub>2</sub> composite, the hydrothermal process was carried out at a temperature of 120 °C for 24 h, and its performance in hydrogen production was tested. The CeO<sub>2</sub>/MoS<sub>2</sub> composite was characterized using XRD, XPS, Raman spectroscopy, SEM, and optical investigation. The optical study showed that after forming a composite with MoS<sub>2</sub>, the absorption edge of CeO<sub>2</sub> is shifted from the ultraviolet to the visible light region. Bandgap values decreased from 2.93 for CeO<sub>2</sub> to 2.34 eV for the CeO<sub>2</sub>/MoS<sub>2</sub> composite. In photocatalytic hydrogen production, Na<sub>2</sub>SO<sub>3</sub>–Na<sub>2</sub>S was used as a sacrificial agent. The CeO<sub>2</sub>/MoS<sub>2</sub> composite exhibited superior photocatalytic hydrogen production performance compared to CeO<sub>2</sub> and MoS<sub>2</sub>. The CeO<sub>2</sub>/MoS<sub>2</sub> composite achieved higher charge separation efficiency, faster charge transfer, more active sites available for redox reactions, and greater affinity towards the reactant ions due to such properties its hydrogen evolution rate has reached 112.5 μmol/h. The photostability of the CeO<sub>2</sub>/MoS<sub>2</sub> composite was tested in up to four cycles, with each cycle being four hours.https://www.mdpi.com/2073-4344/12/10/1185hydrogen productionhydrothermal methodcomposite |
| spellingShingle | Anuja A. Yadav Yuvaraj M. Hunge Seok-Won Kang Visible Light-Responsive CeO<sub>2</sub>/MoS<sub>2</sub> Composite for Photocatalytic Hydrogen Production Catalysts hydrogen production hydrothermal method composite |
| title | Visible Light-Responsive CeO<sub>2</sub>/MoS<sub>2</sub> Composite for Photocatalytic Hydrogen Production |
| title_full | Visible Light-Responsive CeO<sub>2</sub>/MoS<sub>2</sub> Composite for Photocatalytic Hydrogen Production |
| title_fullStr | Visible Light-Responsive CeO<sub>2</sub>/MoS<sub>2</sub> Composite for Photocatalytic Hydrogen Production |
| title_full_unstemmed | Visible Light-Responsive CeO<sub>2</sub>/MoS<sub>2</sub> Composite for Photocatalytic Hydrogen Production |
| title_short | Visible Light-Responsive CeO<sub>2</sub>/MoS<sub>2</sub> Composite for Photocatalytic Hydrogen Production |
| title_sort | visible light responsive ceo sub 2 sub mos sub 2 sub composite for photocatalytic hydrogen production |
| topic | hydrogen production hydrothermal method composite |
| url | https://www.mdpi.com/2073-4344/12/10/1185 |
| work_keys_str_mv | AT anujaayadav visiblelightresponsiveceosub2submossub2subcompositeforphotocatalytichydrogenproduction AT yuvarajmhunge visiblelightresponsiveceosub2submossub2subcompositeforphotocatalytichydrogenproduction AT seokwonkang visiblelightresponsiveceosub2submossub2subcompositeforphotocatalytichydrogenproduction |