Electro-oxidation Of Modified Titanium Based Coating Containing Plattnium Towards Methanol And Its Artificial Intelligent Simulation

The development of high-performance electro-catalyst for organic molecule electro-oxidation is believed the key technology for the treatment of organic wastewater and the commercialization of PEMFC. Multi-component platinum alloys have been proved the best anode material for lowering the anode over-voltage and tolerating CO poisoning. By using the titanium-based anode made from the thermal decomposition method, the electro-catalysis of anode coating containing Pt?towards methanol oxidation is discussed in this dissertation.Thermal decomposition technology is easily realized. But the preparation of high performance anode coating containing Pt?has not been completely researched yet. Thermal decomposition and electrochemical reduction mechanism is discussed in this dissertation using thermodynamics balance and E-pH figures. An improved thermal decomposition technique has also been developed for preparing titanium-based electro-catalytic layers.Cyclic voltammetry(CV) and linear scanning microscopy(LSV) results show that the anode reactive rate is limited at low electrode voltage for electro-oxidation of methanol, formaldehyde or formic acid, the over-voltage being about SOOmV. A further research indicates that the electro-catalytic activity and longtime stability of Pt/Ti electrode are much better than those of pure Pt electrode.Some researches have been carried out to learn about the oxygen evolution properties of RuMn, RuCo, RuCe and RuEu etc in HaSO^ solution, and theirelectro-catalysis towards methanol oxidation if added into the anode coating.The result indicates that the anode coating containing the powerful oxygen evolution metal oxide such as RuMn, RuCo or RuEu exhibit a higher electro-catalytic activity than Pt/Ti electrodes without metal oxides in coating.In addition, the effect of transition metal such as Ru, Mo, ff and Sn on the methanol electro-oxidation is also discussed here. By Comparing the activation area of binary alloy with that of ternary alloy catalyst, the introduction of multi-metal alloy catalyst is found to be able to increase the number of activation site.A reactive kinetic study of these TMO(transition metal oxide) modifiedelectrodes has been performed for. The result is obtained as follows: the reactive order between 0. 5 and 0.62, the reactive rate constant about 1CP, and the apparent activation energy among 51?6kJ mol"1 at 0.4V and among 47?0kJ mol'1 at 0.5V. The transfer coefficient a of some modified electrode is: Pt (0. 81), PtRu (0.86), PtMo (0.96) and PtRuMn (0. 85).The tafel curves of methanol electro-oxidation on TMCHnodified Pt/Ti anode can be divided into three distinct regions. At lower polarization(logil. 6), all of the tafel curves show a curvature until the current densities reach the peak value, indicative of a possible limiting current.The effect of rare earth elements on methanol electro-oxidation has not been reported in literatures. In this dissertation the PtRE electro-catalytic layers are prepared to enhance the activity of Pt catalyst. According to steady state polarization curves normalized by electrochemistry activation area i the electro-catalytic activity order of PtRE electro-catalysts at 0.5V is PtSm> PtTm>PtGd>PtHo>PtEr>PtDy>PtLa>PtPr>PtTb in the solution of 0. lmol/LH2S04+ 1. Omol/LCH3OHThe anode reactive rate increases with the increment of methanol concentration. But the current density doesn't increase any more after the methanol concentration reaches a certain value because the adsorption of methanol on the catalyst has reached the maximum. In addition, the increment of electro-oxidation system temperature or anode potential can lower the app...