Enhancing the methanol electro-oxidation efficiency of Pt/C: influence of MoO3 crystal planes

Abstract

Fuel cell technology is a promising clean energy source, but its commercialization is hindered by high costs, mainly due to the using of precious platinum-based catalysts. To reduce the costs and improve the catalytic efficiency, catalytic promotors are being used. This study focuses on exploring the effect of various crystal planes of molybdenum oxide (MoO3) in promoting the efficiency of platinum (Pt) catalysts. The crystal plane-dependent promotion and antipoisoning effects of MoO3–Pt catalysts on methanol electro-oxidation are investigated. Crystal plane controlled synthesis of MoO3 is explored, and the resulting catalysts are characterized to draw the complete structure and bonding parameters. The electrocatalytic performance of the catalysts is evaluated through cyclic voltammetry, linear sweep voltammetry, electrochemical impedance spectroscopy, and chronoamperometry measurements. The results reveal that the MoO3–Pt catalysts exhibit crystal plane-dependent behaviors, influencing catalytic activity, stability, and antipoisoning effects. Notably, the Pt–MoO3 catalyst with enhanced crystal growth of MoO3 along the {k00} plane family demonstrates superior promotion of methanol oxidation and improved antipoisoning performance, making it a promising candidate for efficient and cost-effective fuel cell applications. This research provides valuable insights into designing advanced catalysts for clean energy technologies.