| Title | Electrospun Manganese-Based Perovskites as Efficient Oxygen Exchange Redox Materials for Improved Solar Thermochemical CO2 Splitting |
| Authors | Riaz, Asim Kreider, Peter Kremer, Felipe Tabassum, Hassina Yeoh, Joyce S. Lipinski, Wojciech Lowe, Adrian |
| Affiliation | Australian Natl Univ, Res Sch Engn, Canberra, ACT 2601, Australia Australian Natl Univ, Ctr Adv Microscopy, Canberra, ACT 2601, Australia Peking Univ, Beijing Key Lab Theory & Technol Adv Battery Mat, Dept Mat Sci & Engn, Coll Engn, Beijing 100871, Peoples R China |
| Keywords | thermochemistry reduction electrospinning perovskites syngas CO2 splitting |
| Issue Date | 2019 |
| Publisher | ACS APPLIED ENERGY MATERIALS |
| Abstract | Developing durable redox materials with fast and stable redox kinetics under high-temperature operating conditions is a key challenge for an efficient industrial-scale production of synthesis gas via two step solar thermochemical redox cycles. Here, we investigate novel electrospun nanostructured La3+-doped strontium manganites, LSM (LaxSr1-xMnO3, x = 0, 0.25, 0.50, and 1), for an efficient CO production with high redox kinetics. The oxidation behavior of these LSM powders was assessed in terms of oxygen recovery and CO yield via thermogravimetric analysis by using air and CO(2, )as oxidation medium. Strontium manganate (SrMnO3) shows the highest CO yield per cycle of 854.20 mu mol g(-1) at a rate of similar to 400 mu mol g(-1) min(-1) when reduced at 1400 degrees C and reoxidized at 1000 degrees C, with high oxygen exchange capacity in terms of oxygen nonstoichiometry of up to 0.29, during CO(2,)( )splitting cycles. However, lanthanum manganite (LaMnO3) demonstrated high yield of CO of 329 mu mol g(-1) with a rate of 110 mu mol min(-1)g(-1) when reduced at 1000 degrees C and reoxidized at 700 degrees C, which is 3 times higher than the yield for SrMnO3 at the same conditions. The oxygen recovery in LSM samples was 4-15% higher during oxidation with air than with CO2. Moreover, the improved structural stability of these nanopowders indicates the potential of electrospinning technique for an up-scale synthesis of oxygen carriers. These findings show that a selective LSM system can be utilized for enhanced CO yield with high kinetics and structural stability at reduction temperatures 1000-1400 degrees C. |
| URI | http://hdl.handle.net/20.500.11897/543661 |
| ISSN | 2574-0962 |
| DOI | 10.1021/acsaem.8b01994 |
| Indexed | ESCI EI |
| Appears in Collections: | 工学院 先进电池材料料理论与技术北京市重点实验室 |
