Study Of Electrocatalysis Anode Materials For Pollution Control

In the Electrochemical method for the pollution control, the study and exploitation of new electrode materials has become a very hot subject. Especially, the anode materials related with electrocatalysis characters are being put more attention than else. With the development of theory and practice of electrocatalysis, more and more new high effective catalytic anode materials have been tapped. In this work, tin dioxide electrode doped with antimony has been prepared using the titanium as the substrate by pyrogenic oxidation and non-aqueous chemical coprecipitation method. Their different structures and properties have been compared and evaluated through some analytical technologies, such as XRD, SEM and so on. Then, C₆₀ and activated carbon fibers have been studied as the new style electrode materials. The main results and conclusion are summarized as follows:Tin dioxide electrode doped with antimony has been prepared through classic pyrogenic oxidation first .The coat has been analysis through XRD and SEM. The XRD indicates this method can get good coat, but it is not so easy. There are many interleaving cracks with the coat, and it is not very even also. Higher oxygen overvoltage has been confirmed compared with lead dioxide and platinum through Linear Sweep Voltammetry.Then, the technique of preparation for nanometer tin dioxide doped-antimony by non-aqueous chemical coprecipitation method has been studied .The heating temperature and concentration of doped-antimony has been studied thoroughly. The results indicate it is difficult to control the particle dimension of tin dioxide doped-antimony made in water solution and it is easy to reunite together. While the particle made in non-aqueous reagent have good uniformity, and it separate each other well. The Cl^- was removed by non-aqueous anion exchange resin drastically and it improves the stability of the sedimentation also .What is more is this method save the time and the quantity of the reagent and the product rate exceeds 95 percent. Heating temperature has a great influence to particle size and the electric resistance. The particleelectric resistance made in low temperature is determine by E Rg , while it is determine byERg % ï¿¡ Re together.The electrode made through coprecipitation method is compared with that made through traditional pyrogenic oxidation method by routine electrochemical test. The result shows that the electrode made through chemical coprecipitation method have more even coat than the another method. There is not interleaving cracks on the coat. Cycle Voltage Scan and Linear Sweep Voltammetry indicate the electrode have better electrocatalysis characters and longer life.The Tin dioxide electrode doped with antimony has been modified by C6o The Linear Sweep Voltammetry show it can reduce the oxygen evolution potential, which turn lower with the film modified turning thicker. This phenomena can be explained as the C6o have the character of short of electron, just like aromatic compound .It can absorb hydroxyl of the water molecule, then reduce the binding energy of water decompose. Of course the mechanism need to be studied thoroughly.The Activated Carbon Fiber is full of stoma; it has big electric resistance in water, which results in the whole electric resistance turning bigger. So effective information cannot be gotten by Linear Sweep Voltammetry. Studying it by microelectrode can get the same conclusion with the infrared analysis that there are some activated functional group. It has catalytic oxidation effect to phenol.