Sb-SnO2颗粒对钛基体PbO2电极的掺杂改性

Modification of PbO2 electrode on titanium by doping Sb-SnO2 particles

为提高PbO2电极在电催化氧化废水处理中的稳定性及催化性能,使用溶剂热法制备的Sb-SnO2颗粒对电沉积PbO2电极进行掺杂改性,采用扫描电镜、X射线衍射、强化寿命测试、线性扫描伏安测量、电催化降解等手段对所得电极的组成和性能进行了表征,并与未掺杂PbO2电极进行了比较。结果表明,改性PbO2电极的表面形貌及氧化物晶型与未改性PbO2电极相比有一定的区别。相比于未改性PbO2电极,改性PbO2电极在稳定性及抑制析氧反应方面均有改善。在对酸性红G溶液的催化降解过程中,改性PbO2电极的表现优于未改性PbO2电极。掺杂颗粒用量为1.0 g/L的电极表现最优,强化寿命时间达到120 h,析氧电位达到1.88 V(相对于Ag/AgCl电极),脱色反应速率常数达到0.0306 min−1。

To improve the stability and catalytic performance of PbO2 electrode in wastewater treatment by electrocatalytic oxidation,PbO2 electrode was doped during its electrodeposition with solvothermally synthesized Sb-SnO2 particles.The composition and properties of the obtained electrode were characterized by scanning electron microscopy,X-ray diffractometry,accelerated life testing,linear sweep voltammetry,and electrocatalytic degradation experiment,and compared with the undoped PbO2 electrode.The results showed that the surface morphology and oxide crystal form of the modified PbO2 electrode are different from those of the unmodified one.Compared with the unmodified PbO2 electrode,the modified PbO2 electrode has improved stability and inhibition of oxygen evolution reaction.During the catalytic degradation of Acidic Red G solution,the modified PbO2 electrode had better performance than the unmodified one.The electrode doped with 1.0 g/L of particles in the electrodeposition bath showed the best performance,with an accelerated life time of 120 h,an oxygen evolution potential of 1.88 V(vs.Ag/AgCl),and a decolorization reaction rate constant of 0.0306 min−1.