Abstract A 5 wt% Pt/C catalyst with around 20 nm cubic platinum particles was prepared through a conventional preparation method (ie, precursor impregnation, reduction, and calcination) by choosing to use hydrophobic solvent in the impregnation procedure. The precise nanoparticles shape control can be achieved by using this preparation method as compared to the commonly used precolloid method. These 20 nm cubic Pt particles ...