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181902-在含[BMIM]PF6 的电解液中电沉积制备PbO2 电极的表征

   日期:2018-11-06     作者:李晓乐,周鸿燕,等    浏览:21    评论:0    
核心提示:中文核心期刊,中国科技核心期刊! DOI: 10.19289/j.1004-227x.2018.19.002在含[BMIM]PF6 的电解液中电沉积制备PbO2 电极的表征
 

中文核心期刊,中国科技核心期刊!


DOI: 10.19289/j.1004-227x.2018.19.002

在含[BMIM]PF6 的电解液中电沉积制备PbO2 电极的表征

李晓乐1, *,周鸿燕1,张晓杰1, 2,王爱菊1,刘改云1(1.济源职业技术学院冶金化工系,河南 济源 459000;2.中国科学院兰州化学物理研究所,羰基合成与选择氧化国家重点实验室,甘肃 兰州 730000)

摘要:将离子液体[BMIM]PF6(1−丁基−3−甲基−咪唑六氟磷酸盐)添加到250 g/L Pb(NO3)2 的电解液中,通过阳极电沉积在预制SnO2 + Sb2O3 中间层的钛网上制备了PbO2 电极(标记为PbO2 I),通过扫描电镜(SEM)、X 射线衍射(XRD)、加速寿命试验、极化曲线测量、电催化降解试验等对其进行了表征,并与采用F−为添加剂时制备的PbO2 电极(标记为PbO2 II)进行对比。结果显示:PbO2 I 电极的晶面取向为β(110),晶粒大小均匀,棱角较多,表面平整致密;PbO2 I 电极的加速寿命和电极性能稳定期分别为168.8 h 和101.2 h。与PbO2 II 电极相比,PbO2 I 电极在20 g/L Na2SO4 电解液中的析氧电位高0.12 V,对100 g/L 苯酚模拟废水的电氧化降解率和化学需氧量(COD)去除率分别高8 个百分点和25 个百分点,而能耗低23%。离子液体改变了PbO2 的结晶过程,提高了电极的稳定性和对苯酚的电催化活性,抑制了析氧副反应。

关键词:二氧化铅电极;离子液体;添加剂;催化活性;加速寿命;苯酚;电氧化

中图分类号:TQ153.2

文献标志码:A

文章编号:1004 – 227X (2018) 19 – 0870 – 05

Characterization of PbO2 electrode prepared by electrodeposition in [BMIM]PF6-containing electrolyte// LI Xiao-le*, ZHOU Hong-yan, ZHANG Xiao-jie, WANG Ai-ju, LIU Gai-yun

Abstract: 1-Butyl-3-methylimidazolium hexafluorophosphate {[BMIM]PF6}, an ionic liquid, was added to a 250 g/L Pb(NO3)2 electrolyte, in which PbO2 electrode (coded as PbO2-I) was prepared by anodic electrodeposition on Ti mesh covered with an intermediate SnO2–Sb2O3 layer. The properties of the PbO2-I electrode were characterized and compared with the one prepared with F− as additive (coded as PbO2-II) by scanning electron microscopy (SEM), X-ray diffraction (XRD), accelerated life test, polarization curve measurement, and electrocatalytic degradation test. The results showed that the PbO2-I electrode is smooth and compact with an orientation of β(110), uniform crystal size, and many edges. The accelerated lifetime and stable performance period of the PbO2-I electrode are 168.8 h and 101.2 h, respectively. The PbO2-electrode has an oxygen evolution potential 0.12 V higher than the PbO2-II electrode in a 20 g/L Na2SO4 electrolyte. The electrocatalytic degradation rate of phenol and the removal rate of COD (chemical demand of oxygen) by using the PbO2-Ielectrode are 8 and 25 percentage points higher and its energy consumption is 23% lower as compared to those by using the PbO2-II electrode. The ionic liquid changes the crystallization of PbO2, improves its stability and electrocatalytic activity, and inhibits the side reaction of oxygen evolution.

Keywords: lead dioxide electrode; ionic liquid; additive; catalytic activity; accelerated life; phenol; electro-oxidation

First-author’s address: Department of metallurgical and Chemical Engineering, Jiyuan Vocational and Technical Collage, Jiyuan 459000, China

PDF全文下载,请点击   1819002_0870-0874_175399.pdf

 
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