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 (La
x
Sr1–x
MnO3, 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 CO2 as oxidation medium. Strontium manganate (SrMnO3) shows the highest CO yield per cycle of 854.20 μmol g–1 at a rate of ∼400 μmol g–1 min–1 when reduced at 1400 °C and reoxidized
at 1000 °C, with high oxygen exchange capacity in terms of oxygen
nonstoichiometry of up to 0.29, during CO2 splitting cycles.
However, lanthanum manganite (LaMnO3) demonstrated high
yield of CO of 329 μmol g–1 with a rate of
110 μmol min–1 g–1 when
reduced at 1000 °C and reoxidized at 700 °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 °C.
for the use of his laboratories in processing these coin cells. Further thanks to Luxmi Devi Narain for graphical support. The authors acknowledge the use of the UCL Legion High Performance Computing Facility (Legion@UCL), and associated support services, in the completion of this work.
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