Simultaneous detection of ascorbic acid and dopamine with electrochemically pretreated carbon nitride electrodes: Comparison with boron-doped diamond electrodes

► Dopamine and ascorbic acid oxidation peaks can be well resolved on carbon nitride electrodes. ► Anodic pretreatment gives the best separation on carbon nitride electrodes for those analytes. ► Carbon nitride and boron doped diamond provide equivalent performances for this application. ► Carbon nitride electrodes show good repeatability after the same pretreatment.