Citation: ZHANG Qi-Bo, HUA Yi-Xin. Effect of the Ionic Liquid Additive-[BMIM]HSO₄ on the Kinetics of Oxygen Evolution during Zinc Electrowinning[J]. Acta Physico-Chimica Sinica, ;2011, 27(01): 149-155. doi: 10.3866/PKU.WHXB20110126 shu

Effect of the Ionic Liquid Additive-[BMIM]HSO₄ on the Kinetics of Oxygen Evolution during Zinc Electrowinning

ZHANG Qi-Bo ,
HUA Yi-Xin

1.
Key Laboratory of Ionic Liquids Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China

Received Date: 30 September 2010
Available Online: 8 December 2010
Fund Project: 国家自然科学基金(50864009, 50904031) (50864009, 50904031)高等学校博士学科点专项科研基金(20070674001)资助项目 (20070674001)

The effect of the ionic liquid additive 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM] HSO₄) on the kinetics of oxygen evolution during zinc electrowinning from an acidic sulfate solution was investigated. We used potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, and X-ray diffraction for this study. Potentiodynamic polarization curves and the corresponding kinetic parameter analysis show that [BMIM]HSO₄ has a catalytic effect on oxygen evolution by stimulating the reaction rate constant. Impedance data reveal that [BMIM]HSO₄ can markedly reduce the oxygen evolution charge transfer resistance. The addition of 5 mg·L^-1 [BMIM]HSO₄ obviously decreased the resistance value by at least 50% over the studied potential range from 1.85 to 2.10 V. In addition, the results of the impedance measurements also suggest an inhibition effect of [BMIM]HSO₄ on the secondary reactions and this is due to the adsorption of the additive on the anode surface, which decreased the amount of active sites for anion adsorption. All electrochemical results were corroborated with a morphological and orientation analysis of the anodic surface after 120 h of anodic polarization. The addition of [BMIM]HSO₄ inhibited the generation of the intermediate product β-PbO₂ and it promoted the generation of larger, loose, and porous α-PbO₂, which benefited the oxygen evolution reaction.
- Electrochemical impedance spectroscopy,
- Zinc electrowinning,
- Oxygen evolution,
- Ionic liquid additive,
- Surface morphology
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Effect of the Ionic Liquid Additive-[BMIM]HSO4 on the Kinetics of Oxygen Evolution during Zinc Electrowinning

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Effect of the Ionic Liquid Additive-[BMIM]HSO₄ on the Kinetics of Oxygen Evolution during Zinc Electrowinning