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Park, Su-Moon
Electrochemistry Lab
Research Interests
  • Electrochemistry and spectroscopy of conducting polymers

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Electrochemical behavior of PbO2 nanowires array anodes in a zinc electrowinning solution

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Title
Electrochemical behavior of PbO2 nanowires array anodes in a zinc electrowinning solution
Author
Yang, Chang jiangPark, Su-Moon
Keywords
Nanowires array anode; Reaction mechanisms; Real-time impedance measurements; Zinc electrowinning solution
Issue Date
201310
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ELECTROCHIMICA ACTA, v.108, no., pp.86 - 94
Abstract
Free-standing PbO2 nanowires were prepared by an electrodeposition process onto the titanium foil. The morphology of nanowires was investigated by SEM analyses. The contact angle of the nanowires was compared with that of planar film, which indicated higher hydrophilicity and surface energy of nanowires. Cyclic voltammetric and real-time Fourier transform electrochemical impedance spectroscopy (FTEIS) experiments were employed to study the anodic reaction on the surface. The cyclic voltammetric data showed the overpotential of nanowire array electrode decreased by more than 100 mV compared to that of the planar film electrode at an anodic current density of 400 A/m2. A large body of impedance data acquired from the two electrodes as a function of scanned potential by running combined staircase cyclic voltammetry and FTEIS experiments led to systematic comparative analysis on the electrode/electrolyte interface. The changes in solution resistances, film resistances and capacitances, double layer capacitances, and polarization resistances observed during oxygen evolution process were compared and explained by corresponding electrochemical reactions. The nanowires of PbO2 showed a large active surface area led to higher capacitance than that of the planar electrode.
URI
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DOI
http://dx.doi.org/10.1016/j.electacta.2013.06.068
ISSN
0013-4686
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