An optimisation of the wet planetary ball milling process for the reduced graphene oxide and copper based electrocatalyst support for proton exchange membrane fuel cells was performed. The optimization was performed in two steps, parameter optimization and solvent selection. The obtained samples were analysed using a scanning electrone microscope (SEM) and X-ray difraction (XRD). It was concluded that extending the milling time over one hour has no significant impact on the quality of the milling process. Increasing rotations per minute (RPM) from 300 to 600 only has a positive impact on the milling process, if cool down time is increaed as well. The best solvent for the milling process proved to be hexane.
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