Abstract:

Ti substrate polytetrafluoroethylene（PTFE）-doped PbO₂（Ti/PTFE-PbO₂）and PTFE，CeO₂-codoped PbO₂（Ti/CeO₂-PTFE-PbO₂）electrodes were prepared by a thermal decomposition-electrodeposition technique，and the factors affecting the electrode lifetime，like current density，temperature，stirring speed and CeO₂ concentration were investigated as well.The electro-oxidative performance of Ti/CeO₂-PTFE-PbO₂ was investigated.The results showed that the prepared Ti/CeO₂-PTFE-PbO₂ electrode had a long accelerated electrolysis lifetime（about 983 h）under the optimum plating conditions，like current density 30 mA·cm^-2，temperature 80℃，stirring speed 1300 r·min^-1 and CeO₂ concentration 3 g·L^-1.The results of SEM and EDX analysis indicated that the Ti/CeO₂-PTFE-PbO₂ electrode had a denser structure and better stability of nonstoichiometry than common PbO₂ electrode had during the accelerated electrolysis.Compared with Ti/PTFE-PbO₂ anode，Ti/CeO₂-PTFE-PbO₂ anode had a higher electro-catalytic activity for the degradation of 4-CP because of its higher potential for oxygen evolution.

Key words:

复合电镀, PbO₂, PTFE, CeO₂, 对氯苯酚

摘要：

采用热分解-电镀法制备了聚四氟乙烯（PTFE）掺杂PbO₂电极（Ti/PTFE-PbO₂）和PTFE、CeO₂共掺杂PbO₂电极（Ti/CeO₂-PTFE-PbO₂），考察了电流密度、温度、搅拌速率、CeO₂浓度等工艺条件对电极寿命的影响。对Ti/CeO₂-PTFE-PbO₂的电催化氧化性能进行了初步研究。结果表明，在电流密度为30 mA·cm^-2、温度80℃、搅拌速率为1300 r·min^-1和CeO₂为3 g·L^-1等较优条件下，Ti/CeO₂-PTFE-PbO₂电极在9 mol·L^-1 H₂SO₄溶液中的强化电解寿命（1A·cm^-2）达983 h。SEM和EDX的分析结果表明，PTFE、CeO₂共掺杂使得Ti/CeO₂-PTFE-PbO₂表面的晶粒排布更均匀致密，电解过程镀层的铅氧计量比也具有较高的稳定性。由于具有更高的析氧电位，与Ti/PTFE-PbO₂电极相比，Ti/CeO₂-PTFE-PbO₂电极对对氯苯酚的降解显示了更好的电催化活性。

关键词:

复合电镀, PbO₂, PTFE, CeO₂, 对氯苯酚