Enhancement of the electrocatalytic activity of La0.6Sr0.4Co0.2Fe0.8O3-δ through surface modification by acid etching
| Autor: | Nianjun Hou, Zhiyong Huang, Lijun Fan, Yongdan Li, Jun Wang, Juanjuan Gan, Xueli Yao, Yicheng Zhao, Tian Gan |
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| Přispěvatelé: | Tianjin University, Industrial chemistry, Department of Chemical and Metallurgical Engineering, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
lanthanum strontium cobalt ferrite
Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Oxygen Catalysis law.invention chemistry.chemical_compound Adsorption law solid oxide fuel cell Calcination Perovskite (structure) oxygen reduction reaction Chemistry General Chemistry 021001 nanoscience & nanotechnology Sr segregation 0104 chemical sciences Lanthanum strontium cobalt ferrite Electrode Surface modification 0210 nano-technology surface modification |
| Popis: | The surface properties of La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) perovskite electrode are modified with HNO3 treatment to improve its catalytic activity towards oxygen reduction reaction between 500–650 °C. The surface concentrations of A-site cations are reduced after the acid etching. After the calcination at 1150 °C, severe segregation of Sr is observed on the surface of untreated LSCF powder, which is suppressed remarkably with the HNO3 pretreatment. Highly reactive oxygen species and Fe4+ species are formed on the surface of LSCF after the HNO3 treatment, which are beneficial to oxygen reduction reaction. The reduction of oxygen species adsorbed on the LSCF surface, the rate-determining step of the electrode process, is accelerated significantly with the acid etching. |
| Databáze: | OpenAIRE |
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