摘要
该文采用热分解法先制备Zr-SnO_(2)中间层,再电沉积β-PbO_(2)层,成功制备了Ti/Zr-SnO_(2)/β-PbO_(2)电极。利用扫描电镜(SEM)、能量散射谱(EDS)、X射线衍射(XRD)、X射线光电子能谱(XPS)技术对电极形貌、晶体结构、元素组成等进行了分析。通过循环伏安法(CV)、电化学交流阻抗法(EIS)、加速寿命实验等测试其电化学性能,考察其电催化降解亚甲基蓝(Methylene Blue,MB)活性,优化电流密度和初始MB浓度。结果表明:Ti/Zr-SnO_(2)/β-PbO_(2)电极的表面为致密四棱锥结构,形成了非化学计量比的β-PbO_(2);与传统的Ti/β-PbO_(2)电极相比,Zr-SnO_(2)中间层可有效提高钛基涂层电极的析氧过电位;修饰电极阻抗为87.64Ω/cm2,电极加速寿命为439 min,是Ti/β-PbO_(2)电极的219.5倍,是Ti/SnO_(2)/β-PbO_(2)电极的1.71倍;在50 mA/cm2的电流密度下降解初始浓度为50.00 mg/L的MB时,180 min内MB去除率可达97%。
Ti/Zr-SnO_(2)/β-PbO_(2) electrode was successfully fabricated by the first thermal decomposition method for preparing Zr-SnO_(2) interlayer and the second electrodeposition ofβ-PbO_(2) layer.The electrode morphology,crystal structure and elemen-tal composition were analyzed using scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)techniques.The electrochemical properties were inves-tigated by cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS),accelerated lifetime tests.The electrocata-lytic degradation of methylene blue(MB)and the optimization of current density and initial MB concentration were carried out.The results showed that Ti/Zr-SnO_(2)/β-PbO_(2) electrode has a compact pyramidal structure,and non-stoichiometricβ-PbO_(2) was formed.In comparison with the conventional Ti/β-PbO_(2) electrode,the impregnation of Zr-SnO_(2) interlayer can effectively improve the oxygen evolution overpotentials of the titanium-based coated electrode,which exhibited low resistance of 87.64Ω/cm2 and accelerated lifetime of 439 min,which is 219.5 times higher than that of Ti/β-PbO_(2) electrode and 1.71 times higher than that of Ti/Zr-SnO_(2)/β-PbO_(2) electrode.The removal rate could reach 97%toward 50.00 mg/L of MB within 180 min at a current density of 50 mA/cm2.
作者
尔古阿沙
高官金
刘强兵
蒋新宇
ERGU Asha;GAO Guanjin;LIU Qiangbing;JIANG Xinyu(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,China;College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2024年第4期1-8,共8页
Environmental Science & Technology
基金
钒钛资源综合利用国家重点实验室开放基金课题(2022P4FZG07A)。
