Preparation and electrochemical properties of Al/TiB2/β-PbO2 layered composite electrode materials for electrowinning of nonferrous metals. Issue 15 (15th October 2018)

• Record Type: Journal Article
• Authors: Han, Zhaohui; Xu, Lei; Kannan, Chandrasekar Srinivasa; Liu, Jianhua; Koppala, Sivasankar; Ju, Shaohua; Zhang, Libo
• Is Part Of: Ceramics international. Volume 44:Issue 15(2018)
• Page Start: 18420
• Page End: 18428
• Publication Date: 2018-10-15
• Subjects: Metal ceramic -- Al/TiB2/β-PbO2 electrode -- Electrical properties -- Layered structures; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.07.059
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this paper, an Al/TiB2 layered composite was prepared by plasma spraying for use as the base material to reduce resistivity and improve electrochemical performance in an electrode. The β-PbO2 coating was prepared by electrochemical deposition. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to study the Al/TiB2 composite and the β-PbO2 coating. The electrochemical performance of the Al/TiB2 /β-PbO2 and Ti/β-PbO2 composites was studied by linear sweep voltammetry (LSV), Tafel polarization curves (Tafel) and electrochemical impedance spectroscopy (EIS). The results indicate that Al/TiB2 /β-PbO2 composite electrode materials with a uniform structure were successfully prepared by plasma spraying and electrochemical deposition. The structure of the Al/TiB2 composite improves the conductivity of the electrode matrix, the optimal value of conductivity is 2.76 × 10 7 S m −1, and the optimal value of density is 8.758 g cm −3 for β-PbO2 coating. The composite also decreases the charge resistance in the double layer structure of the electrode surface, accelerating the charge transfer rate. Compared with the Ti matrix, the Al/TiB2 /β-PbO2 exhibited the best corrosion-resistant performance and electrochemical catalytic activity for electrowinning of nonferrous metals.