Nitrogen-doped Diamond Electrode Property and Anodic Catalytic Degradation of Nitrobenzene

A series of nitrogen-doped diamond（NDD） film electrodes were synthesis by hot cathode direct current plasma chemical vapor deposition（HCDCPCVD） method with varied ratio CH4/H2/N2 gas mixture.Morphologies of diamond films were characterized by SEM.Electrical and electrochemical properties of nitrogen-doped diamond electrodes were characterized by Hall test and cyclic voltammetry.The results show that when the nitrogen flow rate is less than 30 sccm,the conductivity of the film increases slightly with the increase of the nitrogen flow rate.As the nitrogen flow rate continues to increase,the conductivity decreases rapidly,showing the maximum electroconductibility of 5.091 S/cm.The nitrogen-doped diamond electrode has good voltammetric performance with a wide potential window and a low background current in acidic,neutral and alkaline media.Properties of anodic oxidation degradation of nitrogen-doped diamond electrodes were tested using nitrobenzene as target pollutant.In the supporting electrolyte of 0.1 mol/L N