Core–shell hierarchical WO2/WO3 microspheres as an electrocatalyst support for methanol electrooxidation

Abstract

Core–shell WO₂/WO₃ microspheres were prepared using a phase transformation route. The as-prepared Pt–WO₂/WO₃ catalyst exhibits excellent activity and stability towards methanol electrooxidation, compared with those of commercial PtRu/C and Pt/h-WO₃, due to the decrease of the electron-transfer resistance by the modification of using WO₂ as a conductive oxide.