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30mA.cm-2、温度80℃、搅拌速率为1300r.min-1和CeO2为3g.L-1等较优条件下,Ti/CeO2-PTFE-PbO2电极在9mol.L-1H2SO4溶液中的强化电解寿命(1A.cm-2)达983h。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。
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.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第5期1190-1195,共6页
CIESC Journal
基金
国家自然科学基金项目(20406019,20876151)
教育部博士点专项基金项目(SRFDP-20070337001)~~
