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Issue 25, 2018, Issue in Progress
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Polarization behavior of Pb–Co powder-pressed alloy for electrowinning

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Abstract

In this study, Pb–Co powder-pressed alloy was fabricated and used as a suitable anode material to replace Pb–Ca–Sn alloy in electrowinning. The Pb–Co anodes and the traditional Pb–Ca–Sn alloy on the electrochemical properties are investigated in a 160 g L−1 H2SO4 solution at 35 °C using galvanostatic polarization, electrochemical impedance spectroscopy and Tafel test. Thereafter, the anodic oxide layer is observed by energy dispersive X-ray spectroscopy along with scanning electron microscopy and X-ray diffractometry. The results show that the potential and oxygen evolution over-potential of the anodes exhibit a declining trend with increasing the fraction of Co. The anode potential of the Pb-2 wt% Co is approximately 170 mV lower than that of Pb–Ca–Sn alloy and reaches a stable value of 1.291 V at 35 °C, which shows good electrocatalytic performance and commercial application prospect.

Graphical abstract: Polarization behavior of Pb–Co powder-pressed alloy for electrowinning

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Publication details

The article was received on 14 Oct 2017, accepted on 25 Mar 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C7RA11334J
Citation: RSC Adv., 2018,8, 13910-13916
  • Open access: Creative Commons BY-NC license
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    Polarization behavior of Pb–Co powder-pressed alloy for electrowinning

    S. Wang, X. Zhou, C. Ma, B. Long, H. Wang and J. Yang, RSC Adv., 2018, 8, 13910
    DOI: 10.1039/C7RA11334J

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