Feasibility of Waste Engine Oil Electrooxidation with Ni-Co and Cu-B Catalysts

To implement a circular economy policy, methods of using waste products as a starting point for other technologies are constantly researched. One of the waste products that should be disposed of after use is waste engine oil (WEO). Despite the permanent introduction of the electrification of cars, the number of combustion vehicles (and, thus, the production of WEO) is constantly increasing. For these reasons, the reuse of WEOs is extremely important; e.g., to use these oils for energy purposes. One of the potential uses of this type of oil is as fuel for fuel cells (for direct electricity production). To lower the production costs of electrodes for fuel cells, catalysts that do not contain precious metals are being constantly sought. This work shows the research of WEO electrooxidation feasibility with Ni-Co and Cu-B catalysts. The results showed the feasibility of the electrooxidation of WEO emulsion on Ni-Co and Cu-B electrodes in an electrolyte (a water solution of sulfuric acid). Moreover, it was shown that the electrooxidation of the WEO emulsion occurred for all concentrations of WEO in the emulsion for all measurement temperatures (20–80 °C). The highest current density obtained in the measurements was 11 mA cm −2 (at 60 °C) for the Ni-Co electrode.