F^-和Fe^(3+)掺杂对Ti基PbO_2阳极性能的影响

Effect of F^-,Fe^(3+)-doping on Performance of Lead Dioxide Anodes

采用热分解-电镀法制备了Ti基PbO2阳极(Ti/PbO2),F-掺杂PbO2阳极(Ti/F-PbO2),Fe3+掺杂PbO2阳极(Ti/Fe-PbO2)和F-,Fe3+共掺杂PbO2阳极(Ti/F-Fe-PbO2)。采用XRD和EDX测试对电极进行了表征,应用加速电解寿命测试和电催化降解4-氯苯酚(4-CP)污水,考察了F-掺杂,Fe3+掺杂和F-,Fe3+共掺杂对PbO2阳极稳定性及电催化活性的影响。结果表明,Ti/F-PbO2和Ti/Fe-PbO2阳极有相近的电催化降解活性,但与Fe3+掺杂相比,F-掺杂大大提高了PbO2阳极的加速电解寿命。对Ti/F-Fe-PbO2阳极,Fe3+掺杂改善了其导电性能,同时F-掺杂提高了阳极的稳定性能,使其有较长的电解寿命。与Ti/PbO2,Ti/F-PbO2和Ti/Fe-PbO2阳极相比,Ti/F-Fe-PbO2阳极的电催化降解活性显著提高,这不仅与其导电性能的改善有关,更与F-掺杂和Fe3+掺杂对4-CP降解的表面协同作用有关。

Ti-substrate PbO2（Ti/PbO2）, F^- -doped PbO2（Ti/F-PbO2）, Fe^3＋ -doped PbO2（Ti/Fe-PbO2） and F^-, Fe^3＋ -doped PbO2（Ti/F-Fe-PbO2） anodes were prepared by a thermal decomposition-electrodeposition technique. The anodes were characterized by XRD and EDX. The electrochemical stability and electrocatalytic characteristics of the anodes were investigated through the accelerated life tests in H2SO4 solution and degradation of phenolic wastewater, respectively. The results show that Ti/F-PbO2 and Ti/Fe-PbO2 anodes almost have the same electrocatalytic activity; however, compared with Fe^3＋ doping, F^- doping shows a better effect for the increase in the life of PbO2 anode. For Ti/F-Fe- PbO2 anode, Fe^3＋ doping enhances the conductive character of PbO2 anode; meanwhile F^- doping enhances the stability of PbO2 anode. Moreover, compared with Ti/PbO2, Ti/F-PbO2 and Ti/Fe-PbO2anodes, Ti/F-Fe-PbO2 anode shows the highest degradation rate for 4-chlorphenol（4-CP）. The influence of F^- and Fe^3＋ doping on the performance and electrocatalytic activity of PbO2 anodes is also discussed.