Flower-like CoAl layered double hydroxides modified with CeO2 and RGO as efficient photocatalyst towards CO2 reduction
| Autor: | Qiu Wang, Yang Li, Zhi Liu, Zhao Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Oxide 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Catalysis law.invention chemistry.chemical_compound law Materials Chemistry Ultraviolet light business.industry Graphene Mechanical Engineering Metals and Alloys Layered double hydroxides 021001 nanoscience & nanotechnology 0104 chemical sciences Semiconductor chemistry Chemical engineering Mechanics of Materials Reagent Photocatalysis engineering 0210 nano-technology business |
| Zdroj: | Journal of Alloys and Compounds. 881:160650 |
| ISSN: | 0925-8388 |
| Popis: | In this article, a simple yet effective in situ hydrothermal method has been developed to synthesize a series of CeO2 and reduced graphene oxide (RGO) stepwise-doped CoAl-LDH (CACR) composites with CoAl-LDH/CeO2 (CAC) as the intermediate. The smart design well integrates the photo-electrochemical merits of CoAl-LDHs and CeO2 with conductive RGO to form an optimized formula with high light-harvesting ability, efficient charge separation, and rapid electron transfer. Owing to these features, the sample of CAC-5-R-10 containing 5 wt% CeO2 and 10 wt% RGO, is found to be the most efficient one as the catalyst for CO2 photoreduction with a high average CO evolution rate of 5.5 μmol·g−1·h−1 at 25 °C without sacrifice reagent or extra photosensitizer under ultraviolet light, which surpasses those of the single CeO2, CoAl-LDHs, the intermediate of CAC, and many reported LDH-based counterparts. With the assistance of Mott–Schottky curves, the Z-scheme mechanism is proposed for the significantly enhanced photo-activity of the CAC-5-R-10. The present work provides a good sample for integrating LDHs with a second semiconductor and conductive RGO for collaborative optimization of photoelectric characteristics towards enhanced CO2 photoreduction. |
| Databáze: | OpenAIRE |
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