pH值对胶体法制备IrO2催化剂性能的影响

EFFECT OF IrO2 CATALYST PERFORMANCE PREPARED BY COLLOIDAL METHOD WITH DIFFERENT pH VALUES

采用胶体法制备IrO2析氧阳极催化剂材料,通过X射线衍射(XRD)、BET比表面积测试(BET)、扫描电子显微镜(SEM)、循环伏安法(CV)和稳态极化曲线(OER)等多种方法对催化剂的物理化学性能进行表征,研究在胶体法中不同的pH值对固体聚合物水电解析氧催化剂的性能影响。结果表明,尽管合成反应的pH值不同,但胶体法合成的IrO2均可形成金红石相结构,且SEM观察其形貌结构相似;随着反应pH值的不断增大,IrO2催化剂粉体的比表面积反而略有降低,电化学活性面积也相对减小,然而其析氧反应活性变化规律却与之不尽相同,当pH值为9时,合成的IrO2催化剂表现出最佳的析氧反应活性。故而,pH值为9的反应条件可作为胶体法制备催化剂的最佳合成条件。

Using colloidal method to prepare IrO2 oxygen evolution anode catalysts,through the physical and chemistry properties of catalysts been characterized by XRD,BET,SEM,cyclic voltammetry(CV)and steady-state-polarization curve and so on,the effect of the different pH value on the catalysts performance was researched in this paper. The results indicate that the phase structure and the morphology structure of all catalysts are no connection with the different pH value. The BET and electrochemical active area will have a bit decrease when the pH value increases. However,the OER activity is not same as that. When pH=9,it shows the best OER activity. Thus,pH=9 is the optimum synthesis condition for the preparation of catalysts by colloidal method.