稀土La掺杂Ti/Sb-SnO_2电极的制备及性能研究

Preparation and Performance of Ti/Sb-SnO_2 Electrodes Doped with Rare Earth La

采用浸渍法制备稀土La掺杂Ti/Sb-SnO2电极,以活性艳红X-3B为目标有机物,考察电极的电催化性能,对制备温度和La掺杂量进行了详细的实验研究,确定了适宜的制备条件为热处理温度450℃、La掺杂量0.7%。采用SEM、EDS、XRD、XPS等分析方法表征了电极的形貌、组成及结构。发现掺杂稀土La能降低界面电阻,使Sb元素向电极表面富集,电极中的Sb、La元素分别以Sb4+、La3+的形式存在。对空白电极和La掺杂Ti/Sb-SnO2电极进行了动电位扫描测定,考察了空白电极和La掺杂Ti/Sb-SnO2电极的析氧电位;并采用破损法测定它们的电极寿命。结果表明,La掺杂Ti/Sb-SnO2电极具有更高的析氧电位和更长的电极寿命。

The Ti/Sb-SnO2 electrode doped with rare earth La were prepared by Dip coating method. Degeneracy of the prepared electrodes was investigated using reactive brilliant red X-3B as a model pollutant. The parameters of the electrode preparation, including temperature and La doping amount, were studied in detail. The optimal pyrolytic temperature, La doping amount were 450 ℃, 0.7%, respectively. The micrographs, crystal structure, chemical environments of elements and element content on the surface of electrodes were analyzed by SEM, EDS, XRD and XPS. The interface electric resistance dropped and Sb were found to be enriched in the coated layer on the electrode surface when La was introduced; the doped Sb and La were existed in the form of Sb^4＋ and La^3＋, respectively. The oxygen evolution potential of the blank electrode and the Ti/Sb-SnO2 electrode doped with rare earth La was investigated by potentiodynamic scanning method. Electrode life was also measured by damaged checking method. The results show that the Ti/Sb-SnO2 electrode doped rare earth La has higher oxygen evolution potential and longer electrode life than the blank electrode.