稀土Y改性Ti／Sb2O5-SnO2电催化电极的制备及表征

为改善Ti／Sb2O5-SnO2电极的电催化性能,采用浸渍法制备了Y改性Ti／Sb2O5-SnO2电极。以活性艳红X-3B为目标有机物,考察了电极的电催化性能,对制备温度和Y掺杂量进行了详细的实验研究,确定的适宜制备条件为热处理温度550℃、Y掺杂量0.8％。采用SEM、EDS、XRD等分析方法对所制备电极的表面形貌、元素组成及结构进行分析,发现稀土Y的掺杂可以使SnO2粒径变小,有利于电极电催化性能的改善,同时Y元素的引入可使杂质元素Sb、Y在电极表面涂层富集。Y改性Ti／Sb2O5-SnO2电极表面主要是四方相金红石结构的SnO2晶体。电极动电位扫描测试结果表明Y改性Ti／Sb2O5-SnO2电极具有较高的阳极析氧电位,有利于有机物的阳极氧化降解。

Preparation and characterization of Y doped Ti／Sb2O5-SnO2 electro-catalytic electrodes

Yttrium was selected as a promoter for the Ti／Sb2O5-SnO2 electrode to enhance its electro-catalytic characteristics and Y doped Ti／Sb2O5-SnO2 electrodes were prepared by the immersion method. Degeneracy of the prepared electrodes was investigated using reactive brilliant red X-3B as a model pollutant. The parameters of preparing the electrode, including temperature and Y doping content, were studied in detail. The optimal pyrolytic temperature was 550℃, and Y doping content was 0.8％. The micrograph of the electrode surface, the element composition of different layers and the structure of the electrode were analyzed by SEM, EDS and XRD. Compared with the Ti／Sb2O5-SnO2 electrode, the average size of SnO2 grains on the electrode surface of the Y doped Ti／Sb2O5-SnO2 electrode was smaller, which implies a potential improvement in catalytic performance. Sb and Y were found to be enriched in the coated layer on the electrode surface when Y was introduced. The surface of the Y doped Ti／Sb2O5-SnO2 electrode was mainly composed of tetragonal rutile structure SnO2 crystal. The potential sweep results indicate that the Y doped Ti／Sb2O5-SnO2 electrode has high oxygen evolution potential which is in favor of electrochemical oxidation for organic pollutants.