Electrochemical Investigations of BaCe0.7-xSmxZr0.2Y0.1O3-δ Sintered at a Low Sintering Temperature as a Perovskite Electrolyte for IT-SOFCs

Sustainability

Rizwan Raza¹  Asif Nadeem Tabish²  Ahmad Shakeel²  Abdul Ghaffar³  Khurram Siraj⁴  Muneeb Irshad⁴  Quar tul Ain⁴  Mehak Khalid⁴  Qurat ul Ain⁴  Muhammad Rafique⁵  Muhammad Ahsan⁶ 

[1] Clean Energy Research Lab (CERL), Department of Physics, Lahore Campus, COMSATS University Islamabad, Lahore 54000, Pakistan;Department of Chemical Engineering, New Campus, University of Engineering and Technology, Lahore 39021, Pakistan;Department of Physics, Government College University, Lahore 54000, Pakistan;Department of Physics, University of Engineering and Technology, Lahore 54890, Pakistan;Department of Physics, University of Sahiwal, Sahiwal 57000, Pakistan;Department of Thermal Power and Energy Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

关键词: perovskite;    electrolyte;    coprecipitation;    composite;    SOFC;   

DOI  :  10.3390/su132212595

来源: DOAJ

【 摘 要 】

Perovskite materials have gained a lot of interest in solid oxide fuel cell (SOFC) applications owing to their exceptional properties; however, ideal perovskites exhibit proton conduction due to availability of low oxygen vacancies, which limit their application as SOFC electrolytes. In the current project, Sm was doped at the B-site of a BaCe_0.7-xSm_xZr_0.2Y_0.1O_3-δ perovskite electrolyte for intermediate-temperature solid oxide fuel cells (IT-SOFCs). BaCe_0.7-xSm_xZr_0.2Y_0.1O_3-δ electrolytes were synthesized through a cost-effective coprecipitation method and were sintered at a low sintering temperature. The effects of samarium (Sm) doping on the electrochemical performance of BaCe_0.7-xSm_xZr_0.2Y_0.1O_3-δ were investigated. X-ray diffraction (XRD) analysis confirmed that the BaCe_0.7-xSm_xZr_0.2Y_0.1O_3-δ electrolyte material retained the perovskite structure. The secondary phase of Sm₂O₃ was observed for BaCe_0.4Sm_0.3Zr_0.2Y_0.1O_3-δ. Scanning electron microscopic (SEM) imaging displayed the dense microstructure for all the compositions, while prominent crystal growth was observed for composition x = 0.3. The formation of the perovskite structure and the presence of the hydroxyl groups of metal oxides for all the compositions were confirmed by Fourier transform infrared spectroscopy (FTIR). An increased symmetrical disturbance was also observed for the increased doping ratio of the Sm. Thermogravimetric analysis (TGA) of all the compositions showed no major weight loss in the SOFC operating temperature range. It was also noted that the conductivity of BaCe_0.7-xSm_xZr_0.2Y_0.1O_3-δ gradually decreased with the increased contents of the Sm metal. The maximum power density of 390 mW cm⁻², and an open-circuit voltage (OCV) of 1.0 V at 600 °C, were obtained, showing that BaCe_0.7-xSm_xZr_0.2Y_0.1O_3-δ, synthesized by a cost-effective method and sintered at a low temperature, can be used as a proton-conducting electrolyte for IT-SOFCs.

【 授权许可】

Unknown