The effect of thermal treatment on structure and surface composition of PtCo electro-catalysts for application in PEMFCs operating under automotive conditions

► Structural and surface characteristics of PtCo/C cathode catalysts. ► Performance and resistance to degradation at 110 °C in PEMFC. ► No change in active surface area after 10,000 step cycles at 110 °C and 33% R.H. ► Growth of Pt oxide layer protects the catalyst from sintering and dissolution.