Strontium cobaltite oxygen sponge catalyst and methods of use

US9550166B2 · kind B2 · utility

Assignee

• UT-BATTELLE, LLC · US

Inventors

• Ho Nyung Lee · Bodenwerder, DE
• Hyoungjeen Jeen · Knoxville, US
• Woo Seok Choi · Seoul, KR
• Michael Biegalski · Oak Ridge, US
• Chad M. Folkman · San Jose, US
• I-Cheng Tung · Hillsboro, US
• Dillon D. Fong · Elmhurst, US
• John W. Freeland · Oak Park, US
• Dongwon Shin · San Diego, US
• Hiromichi Ohta · Kariya, JP
• Matthew F. Chisholm · Oak Ridge, US

Key dates

• Filing date: Nov 26, 2013
• Grant date: Jan 24, 2017
• Expiry date: Apr 3, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/42
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Rapid, reversible redox activity may be accomplished at significantly reduced temperatures, as low as about 200° C., from epitaxially stabilized, oxygen vacancy ordered SrCoO2.5 and thermodynamically unfavorable perovskite SrCoO3-δ. The fast, low temperature redox activity in SrCoO3-δ may be attributed to a small Gibbs free energy difference between the two topotactic phases. Epitaxially stabilized thin films of strontium cobaltite provide a catalyst adapted to rapidly transition between oxidation states at substantially low temperatures. Methods of transitioning a strontium cobaltite catalyst from a first oxidation state to a second oxidation state are described.