Electrodeposited Pt And Ptru Nanoparticles Without Hydrogen Evolution Reaction On Mesoporous Carbon For Methanol Oxidation

Platinum nanoparticles (Pt NPs) and Platinum-Ruthenium nanoparticles (PtRu NPs) were pulse-electrodeposited (pulse-ECD) on porous carbon (PC). The applied potentials for pulse-ECD were controlled either in the hydrogen evolution reaction (HER) potential range or not. The size of Pt NPs and PtRu NPs prepared via pulse-ECD with HER potential range are 19.45 nm and 5.86 nm, respectively. In comparison with the size of Pt NPs and PtRu NPs prepared via pulse-ECD within nonHER potential range are 19.45 nm and 6.56 nm respectivtly. The efficiency of the electrocatalyst on methanol oxidation is in terms of electrochemical mass activity (ECMA, normalized current density of methanol oxidation per gram of catalyst loading). The ECMA of the commercial Pt nanocatalysts, our prepared Pt NPs and PtRu NPs using pulse-ECD within HER potential ranges were 78 Ag-Pt(-1), 957.56 Ag-Pt(-1), 1013.43 Ag-Pt(-1), respectively. The ECMA of the commercial PtRu nanocatalysts, our prepared Pt NPs and PtRu NPs using pulse-ECD within nonHER potential ranges were 141 Ag-Pt(-1), 1274.05 Ag-Pt(-1), 1465.89 Ag-Pt(-1) respectivtly. TEM diffraction pattern (D.P.) of the nanoparticles deposited within nonHER's potential ranges shown that the highly distortion in the crystal lattice. The results of TEM D.P. characterized that the nonHER's pulse-ECD enhanced the interfacial bonding between the carbon surface and nanoparticles. It is proved that the electrodepostion Pt NPs and PtRu NPs which applied nonHER potential ranges will increase the performance of methanol oxidation.