碳纳米管改性Sb-SnO2/Ti电极制备及性能

摘要

In order to improve the electro-catalytic oxidation activity and stability of Sb-SnO2/Ti electrode,the CNTs-Sb-SnO2/Ti electrode was prepared by sol-gel-thermal decomposition method.The microstructure and electrochemical properties of the modified electrode was characterized via SEM,electrochemical impedance spectroscope (EIS),polarization curve and congo red degradation experiments.Furthermore,its the stability was investigated by accelerated life test.The results indicate that when the optimal doping amount of CNTs is 2.0 g/L the congo red removal rate increases by 14.7％ using the CNTs-Sb-SnO2/Ti electrode compared with the Sb-SnO2/Ti electrode.Meanwhile pore structure appears and roughness increases on the surface of modified electrodes leading to larger specific surface area of electrode.Then the modified electrodes exhibit higher oxygen evolution potential and lower charge transfer resistance.Additionally,accelerated life tests reveal that the modified electrode has better electro-catalytic stability while the service life increases by 27 h.%为了提高Sb-SnO2/Ti电极的电催化氧化活性和稳定性,采用溶胶-凝胶-热分解法制备了CNTs掺杂改性的CNTs-Sb-SnO2/Ti电极,借助于SEM、极化曲线、电化学阻抗谱(EIS)和降解刚果红实验对其微观结构和性能进行了表征,并通过加速寿命实验考察电极的稳定性.结果表明,当CNTs最佳掺杂量为2.0g/L时,CNTs-Sb-SnO2/Ti电极比Sb-SnO2/Ti电极对刚果红的去除率提高了14.7％;改性后的电极表面相对粗糙且增加了孔隙结构,从而提高了电极的比表面积;改性电极具有更高的析氧电位和更小的界面转移阻抗;加速寿命实验表明改性电极的稳定性也得到了提高,使用寿命增加了27 h.