Investigation of Sr0.7Ca0.3FeO3 oxygen carriers with variable cobalt B-site substitution
- National Energy Technology Lab. (NETL), Pittsburgh, PA (United States); National Energy Technology Lab. (NETL), Pittsburgh, PA (United States). Leidos Research Support Team
- National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
A-site and B-site substitution have shown to be effective methods towards improving well-studied oxygen carrier materials that are vital for emerging gasification technologies. This includes SrFeO3, which greatly benefits from the inclusion of calcium and/or cobalt, leading to reports regarding Sr0.8Ca0.2Fe0.4Co0.6O3 as the best-performing composition. In this work, we investigate systems with higher calcium and lower cobalt contents to lessen the societal and economic burdens of these dual-doped carriers. We perform density functional theory calculations to illustrate the Fe-O bonding and relaxation contributions towards the oxygen vacancy formation energy in Sr1-xCaxFe1-yCoyO3 systems (x = 0.1875, 0.25, 0.3125; y = 0.125, 0.25, 0.375, 0.5) and determine that an increased calcium A-site substitution requires the use of less cobalt B-site doping to reach the same oxygen vacancy formation.. Experimentally, we validate these findings by focusing our characterization on bulk Sr0.7Ca0.3Fe1-yCoyO3 materials using in situ and ex situ XRD, O2-TPD, and TGA. We find that Sr0.7Ca0.3Fe0.7Co0.3O3 has a similar O2 cycling efficiency to Sr0.8Ca0.2Fe0.4Co0.6O3 in our experiments. Additionally, both materials are outperformed by Sr0.7Ca0.3Fe1-yCoyO3 systems with y = 0-0.10 at 400-500 °C, which cycle 1.5 wt.% O2 in under ten minutes.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- Grant/Contract Number:
- 89243318CFE000003
- OSTI ID:
- 1843196
- Alternate ID(s):
- OSTI ID: 1804592
OSTI ID: 1783887
OSTI ID: 1890479
- Report Number(s):
- 84
- Journal Information:
- ChemSusChem, Journal Name: ChemSusChem Journal Issue: 8 Vol. 14; ISSN 1864-5631
- Publisher:
- ChemPubSoc EuropeCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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