Stability issues of CO tolerant Pt-based electrocatalysts for polymer electrolyte membrane fuel cells: comparison of Pt/Ti0.8Mo0.2O2-C with PtRu/C

作     者：Vass, Adam Borbath, Irina Bakos, Istvan Paszti, Zoltan Safran, Gyorgy Tompos, Andras 

作者机构：Hungarian Acad Sci Res Ctr Nat Sci Inst Mat & Environm Chem Magyar Tudosok Korutja 2 H-1117 Budapest Hungary Hungarian Acad Sci Ctr Energy Res Inst Tech Phys & Mat Sci Konkoly Thege M Ut 29-33 H-1121 Budapest Hungary POB 286 H-1519 Budapest Hungary 

出 版 物：《REACTION KINETICS MECHANISMS AND CATALYSIS》 (反应动力学、机理与催化)

年 卷 期：2019年第126卷第2期

页      面：679-699页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：European Union State of Hungary - European Regional Development Fund OTKA-project [K112034] 

主　　题：Conducting Ti-based mixed oxides TiMoOx Composite materials Pt electrocatalysts PtRu C CO-tolerance 

摘      要：The stability and CO tolerance of a self-made 20wt% Pt/Ti0.8Mo0.2O2-C mixed oxide-carbon composite supported electrocatalyst was compared to those of a commercial state-of-the-art PtRu/C electrocatalyst by means of cyclic voltammetry and COads stripping voltammetry measurements. On the Pt/Ti0.8Mo0.2O2-C catalyst the oxidation of CO takes place at exceptionally low potential values (E-CO,E-onset=50mV);the onset potential is shifted to less positive potentials by 150mV compared to the PtRu/C catalyst. A stability test involving 500 polarization cycles revealed that the PtRu/C catalyst suffered more significant degradation than the composite supported Pt catalyst. XPS measurements indicated that the degradation is connected to ruthenium dissolution. At the same time, better electrocatalytic stability and increased CO tolerance of the Pt/Ti0.8Mo0.2O2-C electrocatalyst compared to the PtRu/C catalyst was evidenced.