石墨烯-水凝胶改性Ti/TNTs-Sb-SnO_2电极的电催化性能研究

Electrocatalysis of graphene-hydrogel modified Ti/TNTs-Sb-SnO_2

在钛板上电沉积TiO_2纳米管,并通过层层组装方式制备了Ti/TNTs-Sb-SnO_2-rGO电极。用扫描电镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)以及电化学等方法对电极形貌、微观结构和性能进行了表征。实验结果表明,该电极具有高的析氧电位(2.1V)和良好的导电性能。在亚甲基蓝(MB)模拟染料废水的电氧化降解实验中,该电极能够有效去除有机污染物,降解1h,去除率为97%,降解过程符合一级动力学方程,反应速率常数为0.057min-1,降解机理为间接电化学氧化过程。电极的实验室加速寿命为9h,折合工业寿命为1.6a,表明该电极具有较长的使用寿命。

Ti/TNTs-Sb-SnO2-rGO electrode was prepared using layer by layer coating of"Sb-Sn"mixture solution and graphene oxide on Ti/TNTs electrode,TiO2 nanotube was firstly electrodeposited on Ti plate.The morphology,microstructure and performance of prepared electrodes were characterized by SEM,XRD,XPS and electrochemical method.It shown that Ti/TNTs-Sb-SnO2-rGO exhibited high oxygen evolution potential(2.1 V)and outstanding electrical conductivity.Electrocatalytic oxidation degradation of methylene blue(MB,simulated dye wastewater)was used to evaluate the efficiency of Ti/TNTs-Sb-SnO2-rGO.MB was effectively degraded within 60 min and the removal rate reached 97%.The degradation process followed a pseudo first order kinetics with a rate constant(k)value of 0.057 min-1.The degradation mechanism was proved to be indirect electrochemical oxidation process.The electrode acceleration life was 9 h(the real industrial life was 1.6 years),indicating that the electrode had good stability and long service life.