Electrocatalytic Oxidation of Formaldehyde on PtPd Alloy Nanoparticle –Multi-Walled Carbon Nanotube–Ionic Liquid Composite Film

PtPd alloy nanoparticles were electrodeposited on a multi-walled carbon nanotube (MWNT)–ionic liquid (IL, i.e., 1-octyl-3-methylimidazolium hexafluophosphate, OMIMPF6) composite film coated glassy carbon electrode. The resulting electrode (PtPd–MWNT– IL/GCE) was characterized by X-ray diffraction, scanning electron microscope and voltammetry. The influence of some parameters (e.g. electrodeposition time, electrodeposition potential and temperature) on the PtPd alloy nanoparticles was discussed and optimized. The electrocatalytic oxidation of formaldehyde on the electrode was explored, and it was found that the PtPd–MWNT–IL/GCE showed good electrochemical catalysis in H2SO4 solution. When the PtPd–MWNT–IL/GCE was used as a formaldehyde sensor, it displayed wide linear range and good stability.