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Citation: LI Caicai, WANG Senlin, ZHANG Yi. Electrochemical-reduction Characteristics of Maleic Acid on a Porous Pb-Zn Electrode[J]. Chinese Journal of Applied Chemistry, ;2011, 28(5): 583-589. doi: 10.3724/SP.J.1095.2011.00410 shu

Electrochemical-reduction Characteristics of Maleic Acid on a Porous Pb-Zn Electrode

1.
Department of Applied Chemistry, College of Materials Science and Enigeering, Huaqiao University, Key Laboratory for Functional Materials of Fujian Higher Eduction, Xiamen 361021

Corresponding author: WANG Senlin,
Received Date: 13 July 2010
Available Online: 20 September 2010

A Pb-Zn coating was electroplated from methyisulfonic acid bath.The coating was then corroded by 10% H₂SO₄(volume fraction) solution to dissolve zinc.A porous Pb-Zn electrode was therefore successfully prepared.The Pb-Zn coating was composed of Pb(Fm3m) and Zn(P6₆3/mmc).Electrochemical reduction characteristics of maleic acid(MA) on porous Pb-Zn and Pb electrodes were investigated by voltammetry,cathode polarization,chronocoulometry,and electrochemical impedance spectrum(EIS).As a result,MA was absorbed on the electrode surface,and then underwent irreversible electron-transfer reaction.The corresponding diffusion coefficients for MA in H₂SO₄ solution on a Pb and porous Pb-Zn electrode was 1.2×10^-7 and 1.7×10^-7 cm²/s,respectively.The apparent exchange current density(i₀) of MA on a porous PbZn electrode was steadier than that on a Pb electrode.The i₀ of MA on the porous Pb-Zn electrode had a linear relationship with temperature in low temperature,and increased sharply above 50℃,while decreased rapidly when reached to 65℃.The best electrochemical-reduction temperature for MA on porous Pb-Zn electrode was 50~60℃.The catalytic activity of MA on porous Pb-Zn electrode was higher than that on lead electrode.
- porous Pb-Zn electrode,
- maleic acid,
- electrochemical-reduction,
- succinic acid
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