Superior Bifunctional Electrocatalytic Activity of Ba0.5Sr0.5Co0.8Fe0.2O3‐δ/Carbon Composite Electrodes: Insight into the Local Electronic Structure

Carbon acts as an activity booster for Ba0.5Sr0.5Co0.8Fe0.2O3-δ for the oxygen reduction and evolution reactions due to the occurrence of electronic effects that change the local perovskite electronic configuration. The change of the Co oxidation state in Ba0.5Sr0.5Co0.8Fe0.2O3-δ when it is coupled with carbon can account for the superior catalytic activity of composite electrodes compared to single material electrodes. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.