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Oxygen vacancy-mediated photothermal CO2 methanation over Ni/Ce-Zr solid solution catalysts
Di Gao1, Jian-Zhi Yang1, Heng-Yu Wei1
1State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, School of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; Yunnan Key Laboratory of Clean Energy and Energy Storage Technology, Kunming University of Science and Technology, Kunming, 650093, China.
Engineered Ni/Ce-Zr catalysts with oxygen vacancies boost solar-driven carbon dioxide (CO2) hydrogenation for efficient methane production. This approach enhances catalyst activity and stability for solar-fuel applications.
Area of Science:
- Catalysis
- Materials Science
- Renewable Energy
Background:
- Photothermal carbon dioxide (CO2) hydrogenation is key for solar-fuel production.
- Current limitations include inefficient charge separation and low-temperature activity.
Purpose of the Study:
- To develop Ni/Ce-Zr solid solution catalysts with engineered oxygen vacancies.
- To improve CO2 conversion efficiency and low-temperature performance.
Main Methods:
- Synthesized Ni/Ce-Zr solid solutions with lattice distortion.
- Introduced oxygen vacancies to modify electronic structure.
- Utilized in situ DRIFTS for mechanistic studies.
Main Results:
- 20Ni/Ce0.75Zr0.25O2 achieved 79.02% CO2 conversion and >99% CH4 selectivity.
- Demonstrated high methanation rate and low apparent activation energy (16.23 kJ/mol).
- Catalyst remained stable for over 180 hours.
Conclusions:
- Oxygen vacancy engineering effectively enhances photothermal CO2 methanation.
- This strategy improves charge separation, CO2 activation, and catalyst stability.
- Provides a pathway for designing efficient solar-driven CO2 conversion catalysts.
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