期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 22, 期 12, 页码 3663-3671出版社
SPRINGER
DOI: 10.1007/s10008-018-4048-2
关键词
High-temperature electrolysis; High pressure; Electrochemical analysis; Impedance spectroscopy
资金
- ANR (French National Research Council) [APHRODITE N ANR-10-HPAC-001]
This paper is dedicated to the impact of pressure on the electrochemical behaviour of LSCF (La1-xSrxCoyFe1-yO3-) anode in high-temperature electrolysers. This study was carried out with symmetrical cells associating LSCF electrodes to a 3YSZ (yttrium-stabilised zirconia) electrolyte. Impedance spectroscopy measurements were performed using a three-electrode configuration, at temperature as high as 700 to 800 degrees C, in a pressure range from 1 to 30bar. A clear improvement in terms of electrode resistance decrease is highlighted, mainly due to faster oxygen adsorption/desorption kinetics and a better supply of gas to electrochemical reaction sites. Other assumptions were considered and analysed, such as the impact of pressure on LSCF electrical conductivity and on the mechanical contacts. Thus, three contributions were determined as limiting steps at low pressure, up to 5bar, whilst for higher pressure, the optimised conditions in operation are reached. This study completes a previous one related to a modelling approach.
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