稀土Nd改性纳米TiO₂-NTs/SnO₂-Sb电极的制备, 结构及性 能

Nd-doped TiO₂-NTs/SnO₂-Sb electrode was successfully fabricated by solvothermal synthesis approach. Phenol degradation test showed that the electrocatalytic property was affected by Nd doping content. Compare with the control electrode, the degradation rate of phenol and TOC were increased 60% and 52% on the one with Nd3%. The morphology and crystals structure of the catalytic coating were determined through SEM and XRD, the results showed that an optimum Nd content level could gain a denser surface structure and a smaller grain size than the control sample. The analysis of XPS indicated that introducing Nd could reduce the lattice oxygen (O_lat), which was testified from the fact of lower banding energy of Sn displayed on Nd(3%)-doped electrode. In addition, the Sb on the electrode (Nd3%) surface reduced, and the adsorbed oxygen species (O_ads) increased, which was 1.6 times as much as that on the control. The results from EPR further verified the mechanism of performance enhancement, introducing Nd could increase the concentration of oxygen vacancy and thus change chemical environment of the each element on the electrode surface, which greatly raised the oxygen evolution potential and strengthened the generation ability of •OH to destroy organic matters.