稀土Y改性Ti/Sb_2O_5-SnO_2电催化电极的制备及表征

Preparation and characterization of Y doped Ti/Sb_2O_5-SnO_2 electro-catalytic electrodes

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。

Yttrium was selected as a promoter for the Ti/Sb2O5-SnO2 electrode to enhance its electro-catalytic characteristics and Y doped Ti/Sb2 O5-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/Sb2 O5-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 futile 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.