Design of magnetically assembled electrode (MAE) with Ti/PbO2 and heterogeneous auxiliary electrodes (AEs): The functionality of AEs for efficient electrochemical oxidation

•The magnetically assembled electrode has variability and versatility.•Two auxiliary electrodes have different synergy with the main electrode.•Sb-SnO2 is good at offering active sites and eliminating high molecular pollutant.•Pb3O4 is good at enhancing surface roughness and converting pollutant.•Magnetically assembled electrode has high stability and safety.