The Caw Modified Electrode For The Hydroquinone Electric Catalytic

The carbon atom wire (CAW) modified electrodes were prepared in two methods and electro-catalysis of the modified electrodes to the oxidation of dihydroxybenzenes was revealed.In one of the preparation methods, CAWs adsorbed physically on the substrate of glassy carbon. Electrocatalysis of the CAW modified electrode to the electrochemical reaction of Hydroquinone was investigated by use of potential sweep and hydrodynamic methods. In the case of cyclic voltammetry, the anodic peak potential E_pa shifted by 0.102 V negatively and the cathodic peak potential E_pa shifted by 0.143 V positively, while anodic peak current i_pa increased by 7.3 times and cathodic peak current increased by 12.0 times respectively on the CAW modified electrode compared to the corresponding naked glassy carbon electrode in 0.1 mol/L HCl aqueous solution containing 1 mmol/L Hydroquinone. The standard heterogeneous rate constant k⁰ on the modified electrode increased by 6.7 times that of the naked electrode, showing the high electrocatalytic activity of CAWs to electrochemical oxidation of Hydroquinone.Hydroquinone, catechol and resorcinol are three isomers of dihydroxybenzene. The CAW modified glassy carbon electrode showed electrocatalytic responses towards catechol' and resorcinol as well as that toward hydroquinone. In addition, the difference between the anodic potentials on the cyclic voltammograms (CVs) of Hydroquinone and catechol could be as wide as 0.121 V on the CAW modified electrode. Thus, the modified electrode can be applied to simultaneous determination of dihydroxybenzene isomers.The CAWs, graphite and mineral oil were directly mixed to make the CAW modified carbon paste electrode and the electrocatalysis of the modified electrode to hydroquinone was studied. Experimental results showed that the anodic peak potential shifted negatively by 0.152 V and the cathodic peak potential shifted positively by 0.161 V for CVs of hydroquinone on the CAW modified carbon paste electrode, consisting of 0.01 g CAWs, 0.09g graphite and 50 μL mineral oil, compared with the blank carbon paste electrode, indicating anexcellent electrocatalysis of the modified electrode for the electrochemical reaction. The fabrication of the CAW modified carbon paste electrode is simple and the surface of the electrode can be renewed easily. Moreover, this modified electrode is stable and has a long life.