EDS analysis obtained for Carbon-POM hybrid electrodes. Scanning electron microscopy energy-dispersive X-ray spectroscopy (SEM–EDS) analysis was carried out by Cathal Burns (Northumbria University) using a Teacan Mira3 SEM instrument equipped with an Oxford instruments energy-dispersive X-ray analyser. The working distance, accelerating voltage, and beam current were 8.5 mm, 10.0 kV, and 50.0 pA, respectively.