Influence of polarization on the electrochemical activity of La2exCaxNiO4 thorn d electrodes in contact with Ce0.8Sm0.2O1.9 electrolyte

被引：4
作者：
Antonova, E. P. [1 ,2 ]
Khodimchuk, A. V. [1 ,2 ]
Tropin, E. S. [3 ]
Fetisov, A. V. [4 ]
Porotnikova, N. M. [1 ]
机构：
[1] RAS, Inst High Temp Electrochem UB, 20 Akad Skaya St, Ekaterinburg 620066, Russia
[2] Yeltsin Ural Fed Univ, 19 Mira St, Ekaterinburg 620002, Russia
[3] Inst Solid State Chem & Mechanochem, Kutateladze 18, Novosibirsk 630128, Russia
[4] RAS, Inst Met UB, 101 Amundsena St, Ekaterinburg 620016, Russia
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2023年 / 48卷 / 59期
关键词：
La2exCaxNiO4+d; Impedance spectroscopy; Polarization; X-ray photoelectron spectroscopy; Oxygen reduction reaction; OXYGEN-ISOTOPE EXCHANGE; TRANSPORT-PROPERTIES; CATHODES; STABILITY; PERFORMANCE; KINETICS; DELTA; SOFC; PR; LN;
D O I：
10.1016/j.ijhydene.2023.01.343
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of electrode polarization on the electrochemical activity of La2NiO4+d and La1.9Ca0.1NiO4+d electrodes in contact with the Ce0.8Sm0.2O1.9 electrolyte is studied by impedance spectroscopy. It is found that anodic polarization facilitates electrode reaction for both electrodes leading to significant decrease in the polarization resistance. The effect of cathodic polarization differs between the electrodes: the polarization resistance of La2-NiO4+d electrode slightly increases, while the polarization resistance of La1.9Ca0.1NiO4+d electrode strongly decreases with the increase in the applied potential. It is established that in all cases the polarization mostly affects the low-frequency stage of the electrode reaction, connected with oxygen surface exchange and diffusion. The surface state of the samples after exposure under polarization is studied by X-ray photoelectron spectroscopy. Correlations between electrochemical activity of the electrodes and the changes in their surface composition under polarization are discussed.& COPY; 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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收藏
页码：22585 / 22593
页数：9
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