不锈钢/β-PbO_2-CNT复合镀层电极的制备及其性能  

Preparation of Electroplated β-Lead Dioxide/Carbon Nanotube Composite Coating Electrodes on Stainless Steel Substrate and Evaluation of Their Electrochemical Properties

作　　者：袁飞刚[1] 陈步明[1] 郭忠诚[1,2] 石凤浜[1] 徐瑞东[1] 

机构地区：[1]昆明理工大学冶金与能源学院,云南昆明650093 [2]昆明理工恒达科技有限公司,云南昆明650106

出　　处：《材料保护》2013年第3期7-10,3,共4页Materials Protection

基　　金：国家自然科学基金项目(51004056);云南省应用基础研究基金项目(2010ZC052);高等学校博士学科点专项科研基金(20125314-110011);中国科学院无机涂层材料重点实验室开发基金(KKZ6201152009)资助

摘　　要：为了获得一种锌电解用新型阳极材料,在不锈钢上先电化学沉积α-PbO2为中间层,再在镀液中掺杂碳纳米管(CNT)制备了β-PbO2-CNT复合镀层。通过扫描电镜、X射线衍射仪及电化学方法研究了复合镀层的形貌、成分及不同CNT含量的复合镀层在Zn2+-H2SO4体系下的电化学性能。结果表明:CNT掺杂细化了β-PbO2-CNT复合镀层的晶粒,复合镀层表面有正八面体的β-PbO2颗粒、CNT以及因CNT而生成的小八面体β-PbO2晶粒,掺杂CNT提高了复合镀层电极的电催化性能,但对其耐蚀性的提高不多;镀液中CNT的含量为20 g/L时,制备的复合镀层电极的电催化性能和耐蚀性能较好,与Pb-Ag(1%)合金电极相比,以复合镀层电极作锌电解阳极时槽电压下降了160 mV,电流效率有所提高。An intermediate layer of α-PbO2 was prepared on stainless steel substrate by electroplating. Then carbon nanotubes (CNT) were introduced into the plating bath to prepare β-PbO2/CNT composite coatings. As-obtained β-PbO2/CNT composite coatings were used as novel anodes for electrolysis of Zn, and their morphology and composition were analyzed with a scanning electron microscope and an X-ray diffractometer. More-over, an electrochemical test rig was performed to evaluate the electrochemical properties of β-PbO2/CNT composite coatings containing different contents of CNT in the electrolyte consisting of Zn2+-H2SO4. It was found that doping CNT led to refining of the grains of β-PbO2/CNT composite coatings. Octahedral β-PbO2 particulates, CNT and small β-PbO2 grains associated with CNT doping existed on the surface of the composite coatings. Besides, as-prepared composite coating electrodes possessed good electrocatalytic activity, but their corrosion resistance was undesirable. Particularly, the composite coating prepared from the plating bath containing 20 g/L CNT had desired electrocatalytic activity and corrosion resistance, and as an anode for the electrolysis of Zn showed a lower bath voltage and a higher current efficiency than the electrode made of Pb-Ag (1%) alloy.

关 键 词：不锈钢 电沉积 β—PbO2-CNT复合镀层 电化学性能 

分 类 号：TQ153.3[化学工程—电化学工业]