Assessment of Ce_xZr_yHf_zO₂ based oxides as potential solar thermochemical CO₂ splitting materials

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• 作者：Rahul R. Bhosale^a ; ^{rahul.bhosale@qu.edu.qa" class="auth_mail" title="E-mail the corresponding author} ; ^{solar.chemical.engineering@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Anand Kumar^a ; Fares AlMomani^a ; Ujjal Ghosh^a ; Shaheen Al-Muhtaseb^a ; Ram Gupta^b ; Ivo Alxneit^c
• 关键词：CexZryHfzO2 ; Thermochemical cycles ; Solar fuels ; Co-precipitation ; CO2 splitting
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：9354-9362
• 全文大小：2169 K

文摘

In this paper, we report the synthesis, characterization, and assessment of Ce_xZr_yHf_zO₂ (CZH) materials for solar thermochemical splitting of CO₂ in up to 20 consecutive thermochemical cycles. CZH materials with different stoichiometries were synthesized by using the co-precipitation of hydroxides method. CZH materials acquired after calcination were characterized using powder X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, and BET surface area. The thermochemical CO₂ splitting ability of the derived CZH materials was assessed by performing multiple thermochemical cycles using a thermogravimetric analyzer. All CZH materials studied exhibit a higher activity than ceria modified with Hf or Zr alone. Thus a synergistic effect seems to be present. Among the different CZH materials examined, Ce_0.895Zr_0.046Hf_0.053O_1.988 (CZH5) was observed to be the most active exhibiting a sustained redox activity in terms of CO production/O₂ release in the temperature range of 1000–1400 °C. Moreover, CZH5 was subjected to 20 consecutive thermochemical cycles during which no degradation could be observed. The results obtained indicate that CZH5 is a promising candidate for solar thermochemical conversion of CO₂ as it is capable of producing stable amounts of O₂ and CO in multiple thermochemical cycles.