Electrochemical study of Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃ perovskite as bifunctional catalyst in alkaline media

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• 作者：Chao Jin ; Xuecheng Cao ; Fanliang Lu ; Zhenrong Yang ; Ruizhi Yang
• 关键词：Oxygen reduction reaction ; Oxygen evolution reaction ; Ba0.5Sr0.5Co0.8Fe0.2O3 perovskite ; Bifunctional catalyst
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：21 August, 2013
• 年：2013
• 卷：38
• 期：25
• 页码：10389-10393
• 全文大小：704 K

文摘

Ba_0.5Sr_0.5Co_0.8Fe_0.2O₃ perovskite oxide has been synthesized by a sol-gel method, and characterized by XRD, SEM, BET. This oxide has a porous structure and a specific surface area of 2.78?m²?g^?1. The catalytic activity of the oxide for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in 0.1?M KOH solution has been studied by using a rotating ring-disk electrode (RRDE) technique. RRDE results show that the ORR mainly favors a direct four electron pathway, and a maximum cathodic current density of 6.25?mA?cm^?2 at 2500?rpm was obtained, which is close to the behavior of Pt/C (20?wt % Pt on carbon) electrocatalyst in the same testing conditions. Compared with pure C electrode, BSCF is more active for OER, a lower onset potential for OER and a bigger anodic current at the same applied potential are observed.