聚乙烯醇改性PbO<sub>2</sub>电极的制备和性能研究

doi:10.11902/1005.4537.2013.218

中国腐蚀与防护学报

2015, Vol. 35

Issue (1): 81-85 DOI: 10.11902/1005.4537.2013.218

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聚乙烯醇改性PbO₂电极的制备和性能研究

王美清, 杨卫华(

), 蔡成杰, 林小燕, 付芳

华侨大学材料科学与工程学院厦门 361021

Influence of Polyvinyl Alcohol on Structure and Property of PbO₂ Electrode

WANG Meiqing, YANG Weihua(

), CAI Chengjie, LIN Xiaoyan, FU Fang

College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China

全文: PDF(891 KB) HTML

摘要:

采用电沉积法制备了表面活性剂聚乙烯醇 (PVA) 改性PbO₂电极,利用扫描电镜 (SEM) 和X射线衍射(XRD) 技术对其进行了表面物相与结构分析,通过电化学阻抗谱 (EIS)、线性电位扫描 (LPV)、苯酚降解实验和强化寿命测试对其进行了电化学性能表征。结果表明:改性后电极具有PVA网络与PbO₂网眼的致密结构,晶粒明显细化,比表面积增大,电化学反应电阻减小且析氧过电位提高。PVA改性的PbO₂电极电催化性能和使用寿命显著提高,对于最优改性电极 (PbO₂-PVA (0.6)),电解2 h时苯酚降解率高达96.9%,强化寿命较改性前提高了31 h。

关键词 ： PbO₂电极, 聚乙烯醇, 电催化, 苯酚

Abstract：

Titanium based PbO₂ electrode was surface modified by electrodepositing in a polyvinyl alcohol (PVA) containing electrolyte, then its phase composition and microstructure was characterized by SEM and XRD. While the electrochemical properties of the modified electrode was examined by means of electrochemical impedance spectroscopy (EIS), linear potential sweep (LPV), degradation experiment of phenol and accelerated lifetime tests. Results show that the modified electrode has a high-dense structure composed of network-like PVA on mesh-like PbO₂. The surface modification process also results in decreasing the particle size and increasing the specific surface area of the film on electrode. Compared with the original PbO₂ electrode, the modified PbO₂electrode presents a relatively lower electrochemical impedance as well as a higher oxygen evolution reaction potential. Finally, the modified PbO₂ electrode exhibited higher electrocatalytic activity and longer service time. As an example, 96.9% of phenol in artificial waste water can be removed within 2 h by an electrocatalytic degradation process with a properly modified electrode PbO₂-PVA (0.6) and the service time of that electrode was ca 1.5 fold of the original one.

Key words： PbO₂ electrode polyvinyl alcohol electrocatalysis phenol

ZTFLH:

O646.5

基金资助:国家自然科学基金项目 (21103055) 和华侨大学基本科研业务专项基金项目 (JB-ZR1139) 资助

作者简介: null

王美清，女，1988年生，硕士生

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引用本文:

王美清, 杨卫华, 蔡成杰, 林小燕, 付芳. 聚乙烯醇改性PbO₂电极的制备和性能研究[J]. 中国腐蚀与防护学报, 2015, 35(1): 81-85.
Meiqing WANG, Weihua YANG, Chengjie CAI, Xiaoyan LIN, Fang FU. Influence of Polyvinyl Alcohol on Structure and Property of PbO₂ Electrode. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 81-85.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.218 或 https://www.jcscp.org/CN/Y2015/V35/I1/81

图1 未改性和PVA改性的PbO2电极的SEM像

图2 PVA改性前后PbO2电极的XRD谱

图3 不同浓度PVA改性PbO2电极的电化学抗谱

表1 不同浓度PVA改性电极的阻抗谱拟合数据

图4 不同浓度PVA改性PbO2电极的析氧极化曲线

图5 不同浓度PVA改性PbO2电极对苯酚的降解率

图6 加速电极寿命测试中槽电压随时间的变化曲线

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