Electrochemical performance of La0.6Sr0.4CoO3-δ cathode in air and wet air for BaCe0.54Zr0.36Y0.1O3-based proton-conducting solid oxide fuel cell

International Conference on Sustainable Energy and Green Technology 2018

能源学;生态环境科学

Abdul Samat, Abdullah^1^2 ; Rao Somalu, Mahendra^1 ; Muchtar, Andanastuti^1^3 ; Osman, Nafisah^4

Fuel Cell Institute, Universiti Kebangsaan Malaysia, UKM, Bangi, Selangor

43600, Malaysia^1

Faculty of Engineering Technology, Universiti Malaysia Perlis (UniMAP), Kampus UniCITI Alam, Sungai Chuchuh, Padang Besar, Perlis

02100, Malaysia^2

Centre for Materials Engineering and Smart Manufacturing, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, UKM, Bangi, Selangor

43600, Malaysia^3

Faculty of Applied Sciences, Universiti Teknologi MARA, Perlis, Arau

02600, Malaysia^4

关键词: Area-specific resistances;    Electrocatalytic activity;    Electrochemical performance;    Electrode material;    Intermediate temperatures;    Proton conducting;    Proton-conducting electrolyte;    Proton-conducting solid oxide fuel cells;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/268/1/012136/pdf
DOI  :  10.1088/1755-1315/268/1/012136

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Solid oxide fuel cell (SOFC) electrodes often suffer from degradation resulting from different contaminations such as water vapour from air during high-temperature operation. Thus, humidity-resistant electrode materials must be developed for SOFC application. In this work, La0.6Sr0.4CoO3-δ (LSC) material is prepared by sol-gel method and evaluated as a potential cathode to be operated with proton-conducting electrolyte of BaCe0.54Zr0.36Y0.1O3 (BCZY) at intermediate temperature (500 - 800 °C). An LSC|BCZY|LSC symmetrical cell is fabricated by screen printing an LSC cathode ink onto a BCZY electrolyte pellet. The electrochemical performance of the LSC cathode for the fabricated symmetrical cell in air and wet air is characterised using an electrochemical impedance spectroscopy (EIS) analyser. EIS results revealed that the area specific resistance value of the LSC cathode in wet air is lower than that in air at temperatures ranging from 600 °C (0.35 Ω cm2) to 800 °C (0.06 Ω cm2) with a low value of activation energy (0.70 eV). Hence, the LSC cathode exhibits better electrocatalytic activity and performance in wet air than in air. This work suggests that the LSC material meets the requirements for application as a cathode in intermediate-temperature proton-conducting SOFC based on BCZY electrolyte.