Reduced formation of peroxide and radical species stabilises iron-based hybrid catalysts in polymer electrolyte membrane fuel cells  

作　　者：Dongyoon Shin Sabita Bhandari Marc FTesch Shannon ABonke Frédéric Jaouen Sonia Chabbra Christoph Pratsch Alexander Schnegg Anna K.Mechler 

机构地区：[1]Max Planck Institute for Chemical Energy Conversion,Stiftstr.34–36,45470 Mülheim an der Ruhr,Germany [2]ICGM,Univ.Montpellier,CNRS,ENSCM,Montpellier,France [3]Fritz Haber Institute of the Max Planck Society,Department of Inorganic Chemistry,Faradayweg 4-6,14195 Berlin,Germany

出　　处：《Journal of Energy Chemistry》2022年第2期433-438,共6页能源化学（英文版）

基　　金：a fellowship from the Alexander von Humboldt foundation。

摘　　要：The incorporation of Pt into an iron-nitrogen-carbon(Fe NC)catalyst for the oxygen reduction reaction(ORR)was recently shown to enhance catalyst stability without Pt directly contributing to the ORR activity.However,the mechanistic origin of this stabilisation remained obscure.It is established herein with rotating ring disc experiments that the side product,H_(2)O_(2),which is known to damage FeNC catalysts,is suppressed by the presence of Pt.The formation of reactive oxygen species is additionally inhibited,independent of intrinsic H_(2)O_(2) formation,as determined by electron paramagnetic resonance.Transmission electron microscopy identifies an oxidised Fe-rich layer covering the Pt particles,thus explaining the inactivity of the latter towards the ORR.These insights develop understanding of Fe NC degradation mechanisms during ORR catalysis,and crucially establish the required properties of a precious metal free protective catalyst to improve Fe NC stability in acidic media.

关 键 词：ELECTROCHEMISTRY Fuel cells Oxygen reduction reaction Non-precious metal catalyst Hybrid catalyst Stability 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学]