Co-Precipitation Synthesized Ag-Doped Ceria Redox Material (ACRM) for the Thermochemical Conversion of CO<sub>2</sub> into Solar Fuels
In this investigation, an effort was made to introduce Ag into the CeO<sub>2</sub> fluorite crystal lattice to form Ce<sub>0.99</sub>Ag<sub>0.01</sub>O<sub>2-δ</sub> (ACRM) using an ammonium hydroxide-assisted co-precipitation method. The resulting pow...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-09-01
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| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/14/18/8272 |
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| Summary: | In this investigation, an effort was made to introduce Ag into the CeO<sub>2</sub> fluorite crystal lattice to form Ce<sub>0.99</sub>Ag<sub>0.01</sub>O<sub>2-δ</sub> (ACRM) using an ammonium hydroxide-assisted co-precipitation method. The resulting powder obtained after the co-precipitation reaction, filtration, and drying was annealed at 800 °C in a muffle furnace to obtain crystalline ACRM. The phase composition and microstructure of the synthesized ACRM were analyzed using a powder X-ray diffractometer (PXRD) and a scanning electron microscope (SEM). The characterized ACRM powder was then subjected to multiple thermochemical thermal reduction (TR) and CO<sub>2</sub> splitting (CDS) cycles using a high-temperature thermogravimetric analyzer (TGA). The TR step was conducted using Ar gas as an inert atmosphere, maintaining the temperature at 1400 °C for 60 min. Subsequently, the same powder was subjected to the CDS step by treating it with a gaseous mixture of 50% CO<sub>2</sub> and Ar gas at 1000 °C for 30 min. ACRM displayed stable redox reactivity towards thermochemical CDS cycles by generating an average of 50.9 μmol of O<sub>2</sub>/g·cycle and 101.6 μmol of CO/g·cycle, respectively, over 10 thermochemical cycles. |
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| ISSN: | 2076-3417 |