RuO_2-SnO_2阳极电催化活性及氧化电解水制备  

Electrocatalytic performance of RuO_2-SnO_2 anode and the preparation of electrolyzed oxidizing water

作　　者：李文阳[1] 任占冬[1] 朱玉婵[1] 杨晓鸿[1] 全姗姗[1] 高洁[1] 柴波[1] 陈红梅[1] 

机构地区：[1]武汉轻工大学化学与环境工程学院,武汉430023

出　　处：《功能材料》2015年第19期19118-19125,共8页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(31101370);武汉轻工大学校立科研计划资助项目(2015d8)

摘　　要：氧化电解水是一种高效、环保的杀菌剂,在医疗卫生、食品安全和农业生产方面有着广泛的应用。但目前氧化电解水制备过程中,缺少对关键电极材料的研究,没有建立电极材料与杀菌活性因子(HClO)之间的关系。采用热分解法制备RuO2-SnO2氧化物合金电极。通过XRD表征可以看出其晶型为典型的金红石型结构,进一步通过循环伏安(CV)表征证明其表面为典型的RuO2电化学特征,没有SnO2电化学特征。在此基础上,利用线性伏安(LSV)技术分别考察了RuO2-SnO2的析氯极化曲线和析氧极化曲线,研究表明电流密度为70 mA/cm2时,RuO2-SnO2电极的析氯析氧电势差为368mV,而RuO2为278mV,提高了析氯反应选择性。在此基础上,对RuO2-SnO2电极在实际制备氧化电解水过程中的电解效率,有效氯含量、次氯酸含量及强化实验寿命进行了考察。结果表明,RuO2-SnO2电极比RuO2电极氯离子电解效率提高了11.34%,有效氯含量提高了35.57%,次氯酸含量提高了33.62%,电极强化实验寿命提高了14倍。最后,通过SEM表征和电化学孔隙率的计算,表明RuO2-SnO2电极表面较平整,内部孔隙率大,所以使电解液不容易渗透到电极内部,而使电极的耐腐蚀性和使用寿命都将得到提高。Electrolyzed oxidizing water(EOW),as an innovative disinfectant characterized by its high efficiency,broad antimicrobial spectrum,and non-toxic residues,has been broadly used in health care,food safety,and agricultural production.But in the process of EOW preparation,there are lack of research of the key electrode material,and it was not to establish the relationship between the electrode materials and bactericidal activity factor(HClO).RuO2-SnO2 anode was prepared by thermal decomposition method.It could be seen that the crystal type of RuO2-SnO2 was the typical rutile structure by X-ray diffraction(XRD).The electrode surface exhibited the electrochemical characteristics of RuO2 through cyclic voltammetry(CV)without the characteristics of SnO2.The polarization curve of chloride evolution and oxygen evolution were further studied by Linear sweep voltammetry(LSV).With the current density of 70mA/cm2,the potential difference between chloride evolution and oxygen evolution was 368 mV for RuO2-SnO2 electrode,but 278 mV for RuO2 electrode.It suggests that the selectivity of chlorine evolution reaction of RuO2-SnO2 electrode is higher than that of RuO2 electrode.On this basis,electrolysis efficiency,available chlorine content,hypochlorous acid content and the acceleration life test of RuO2-SnO2 electrode were all studied in the actual preparation process of electrolyzed oxidizing water.The results showed that compared with RuO2,the electrolysis efficiency of RuO2-SnO2 electrode increased by 11.34%available chlorine content increased by 35.57%and hypochlorous acid content increased by33.62%.And,what's more,the acceleration life is increased 14 fold.Finally,by SEM characterization and electrochemical porosity calculations of RuO2-SnO2 electrode,it had suggested that the electrode surface is smooth and the internal porosity is large.So it can hinder the electrolyte penetration into the inner of electrode,enhance the electrode corrosion resistance,and improve the service life.

关 键 词：氧化电解水 RuO2-SnO2 电解效率 有效氯 次氯酸 使用寿命 

分 类 号：TQ151.2[化学工程—电化学工业]