Unraveling Oxygen Electrocatalysis Mechanisms on a Thin-Film Oxygen-Deficient Perovskite La0.6Sr0.4CoO3−δ
| Autor: | Kevin Huang, Tianrang Yang, Xinfang Jin, Ralph E. White, Victoria F. Mattick |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
020209 energy Inorganic chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry Electrocatalyst 01 natural sciences Oxygen law.invention chemistry.chemical_compound law 0202 electrical engineering electronic engineering information engineering Materials Chemistry Electrochemistry Chemical Engineering (miscellaneous) Electrical and Electronic Engineering Rotating disk electrode Clark electrode Oxygen evolution 0104 chemical sciences Dielectric spectroscopy chemistry Linear sweep voltammetry |
| Zdroj: | ACS Applied Energy Materials. 1:3937-3946 |
| ISSN: | 2574-0962 |
| DOI: | 10.1021/acsaem.8b00669 |
| Popis: | In this work, a perovskite-structured and oxygen-deficient oxide, La0.6Sr0.4CoO3−δ (LSCO), has been investigated as a model bifunctional thin-film oxygen electrode for alkaline metal–air cells. The rotating disk electrode (RDE) configuration in combination with common electrochemical techniques such as linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were applied to characterize the behavior of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) taking place on LSCO in 0.1 M KOH solution. The results show that the oxygen electrocatalysis process in LSCO follows a multistep charge-transfer pathway. A physics-based, generalized electrochemical model, encompassing two sequential 2e– steps with HO2– as an intermediate species and one parallel 4e– step, has been established to account for the multistep charge-transfer behavior with very satisfactory results, yielding a series of important electrode kinetic transfer coefficients and exchange current densiti... |
| Databáze: | OpenAIRE |
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