Electrochemical Performance of Different Ti-based Composite Electrode Materials

YANG Ya-nan, CAO Mei, GUO Zhong-cheng, WANG Mei-mei

Surface Technology ›› 2017, Vol. 46 ›› Issue (8) : 43-48.

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Surface Technology ›› 2017, Vol. 46 ›› Issue (8) : 43-48. DOI: 10.16490/j.cnki.issn.1001-3660.2017.08.007
Special Topic—Composite Coatings and Preparation Technology

Electrochemical Performance of Different Ti-based Composite Electrode Materials

  • YANG Ya-nan1, CAO Mei2, GUO Zhong-cheng3, WANG Mei-mei3
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Abstract

The work aims to reduce energy consumption by preparing Ti/Pb-WC-PANI composite of good electrocatalytic activity and corrosion resistance and using it as electrode material in zinc electrowinning process. The pulsed electrodeposition method was applied on Ti substrate, and pure lead was used as bond coat, and then tungsten carbide and polyaniline were plated. By comparing and analyzing steady polarization curve, cyclic voltammetric curve and electrochemical impedance spectroscopy of the pulsed Pb-WC-PANI composite coating, DC Pb-WC-PANI composite coating, lead-silver alloy and pure lead, electrocatalytic activity of oxygen evolution was studied, corrosion resistance was studied using Tafel curve. The lead base coat was prepared provided with current density of 2 A/dm2, forward conduction time of 0.3 ms, period of 1.5 ms, working time of 200 ms, magnetic stirring and plating time of 1.5 h at 25 ℃. Then the Pb-WC-PANI was plated provided with impulse average current density of 2 A/dm2, pulse width of 0.3-0.5 ms, pulse period of 1.5 ms, deposition time of 1 h at 25 ℃, and Ti/Pb-WC-PANI composite was obtained. It has the lowest oxygen-evolution potential threshold: 1.7 V, volt ampere charge: q*=0.54 C/cm2, corrosion potential Ecorr=-0.530 V (vs. SCE), corrosion current density: Jcorr=6.90×10-4 A/cm2. Pulsed Pb-WC-PANI composite can effectively reduce oxygen evolution potential, it features in the highest voltammetric charge, low reaction impedance and best surface electrocatalytic activity; in addition, it has the highest corrosion potential, the lowest corrosion current density and the best corrosion resistance, and it exhibits good comprehensive performance in the zinc electrodeposition simulated solution.

Key words

composite; pulse electrodeposition; steady-state polarization curve; cyclic voltammetry curve; AC impedance curve; Tafel curve

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YANG Ya-nan, CAO Mei, GUO Zhong-cheng, WANG Mei-mei. Electrochemical Performance of Different Ti-based Composite Electrode Materials[J]. Surface Technology. 2017, 46(8): 43-48

Funding

Supported by Kunming University of Science and Technology Talent Training Fund (KKSY201407084)
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