The focus of this work is to identify oxygen vacancies as an activity descriptor for designing of complex oxides, i.e. perovskites (ABO3) and brownmillerites (A2B2O5), toward oxygen evolution reaction (OER). Complex oxides present an intriguing class of materials with high tunability of structure and properties. Novel solid state and gas phase synthesis methods were employed to develop a series of compounds, CaxSr2-xFe2O6-δ (x = 0.25) with varying structure types and oxygen vacancies. Structures were identified by X-ray Diffraction and their electronic properties were characterized using X-ray Photoelectron Spectroscopy. Analysis of electrochemical activity was conducted via a rotating disc electrode.
Herein we present novel research of catalytic activity of perovskites and brownmillerites with Fe as the sole B site cation and doping of the A site cation with an element of the same valency but larger atomic radius. Comparison of activity to electronic property measurements shows that oxygen vacancies are an important descriptor in the design of transition metal oxides.
|Commitee:||Tavassol, Hadi, Shon, Young-Seok|
|School:||California State University, Long Beach|
|Department:||Chemistry and Biochemistry|
|School Location:||United States -- California|
|Source:||MAI 81/1(E), Masters Abstracts International|
|Subjects:||Inorganic chemistry, Materials science|
|Keywords:||Oxygen vacanies, Oxygen evolution reaction, Complex oxides|
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