Application of Double Potential-Step Chronocoulometry to the Study of the Cathodic Reduction of Oxalic Acid
A double potential-step chronocoulometric method is an significant method for the study of adsorption. It is known that the product glyoxylic acid(R) adsorbed on the fresh electrode surface. While with the galvanostatic electrolysis the reactant oxalic acid(O) adsorbing gradually on the electrode surface is proved. At this time a large of lead oxalate crystal can be found on the electrode surface by scan electronic microscope(SEM). Adding the additive tetrapropylammoniumhydroxide (TPAH) into the catholyte the fresh electrode surface is adsorbed by O. And at the first two hour the current efficiency is 95.60%.With the galvanostatic electrolysis the potential become more and more negative, which result in the additive deadsorbed. It is confirmed that the surface is presented that both O and R(glyoxylic acid) are adsorbable when t=4～10h, and the current efficiency is decreased correspondingly from 76.66% to 47.10%.
double potential-step chronocoulometry adsorption on electrode surface oxalic acid electroreduction
Zhu Zhu Xinsheng Zhang Hao Yang Wei Wang
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, China, 200237
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）