Direct solar thermochemical CO2 splitting based on Ca- and Al- doped SmMnO3 perovskites: Ultrahigh CO yield within small temperature swing

Ke Gao, Xianglei Liu, Zhixing Jiang, Hangbin Zheng, Chao Song, Xinrui Wang, Cheng Tian, Chunzhuo Dang, Nan Sun and Yimin Xuan

Renewable Energy, 2022, vol. 194, issue C, 482-494

Abstract: Solar thermochemical CO2 splitting is a promising route to reduce environment pollution and mitigate energy crisis. However, traditional redox materials are limited by low CO production, slow reaction kinetics, and poor cycling stability, which results in low solar-to-fuel efficiency. Here, Ca- and Al- doped SmMnO3 perovskites are proposed for high-performance solar thermochemical CO2 splitting. The average CO yield of Sm0.6Ca0.4Mn0.8Al0.2O3 reaches a record-high value of 595.56 μmol g−1 when swinging between 1350 °C and 1100 °C. The CO yield is about 4.22 times as high as that of undoped SmMnO3 (140.97 μmol g−1) under the same conditions, and remains stable over multiple cycling. The ultrahigh CO yield can be attributed to the transformation of reaction mechanism from solid-state surface reaction (F2) to bulk diffusion model (D2). Besides, Ca- and Al- doped SmMnO3 perovskites possess high solar absorptance over 86.5% (in stark contrast to 12.1% of CeO2), so that only solar concentration ratio of 898 (Sm0.6Ca0.4Mn0.8Al0.2O3) is required to drive thermochemical reactions while benchmark CeO2 needs 1936. This work provides novel approaches for high-performance solar thermochemical CO2 splitting with high CO yield, good cycle stability, small temperature swing, and low solar concentration required.

Keywords: Solar thermochemical; CO2 splitting; Solar fuels; Perovskites (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148122007522
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:194:y:2022:i:c:p:482-494

DOI: 10.1016/j.renene.2022.05.105

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().