Inhibition Effects of Some Polymers on Electroreduction of Anions at the Mercury/Solution Interface
スポンサーリンク
概要
- 論文の詳細を見る
The present work was conducted to investigate the electroreduction of anions (typically S<SUB>2</SUB>O<SUB>8</SUB><SUP>2−</SUP> and BrO<SUB>3</SUB><SUP>−</SUP>) under the influence of the adsorption of polymers (polyethyleneglycol, alkylphenoxy polyethoxy ethanols and polyvinylpyrrolidone) on the electrode surface. The limiting current of S<SUB>2</SUB>O<SUB>8</SUB><SUP>2−</SUP> reduction was depressed by the polymers in the region from nearly the zero-charge potential to the more negative potential. The half-wave potential of BrO<SUB>3</SUB><SUP>−</SUP> reduction shifted towards more negative potential by adding the polymers. In the potential range where the cathodic current was mainly controlled by mass transfer of the anions, the time (<I>t</I><SUB>m</SUB>) needed to complete the formation of a monolayer was obtainable conveniently from the instantaneous current <I>vs</I>. time (<I>I</I>–<I>t</I>) curve as reported previously for the inhibited reduction of Cd<SUP>2+</SUP> or Cu<SUP>2+</SUP>. In the potential range where the current was mainly controlled by charge transfer, an exact determination of <I>t</I><SUB>m</SUB>, by which the maximum surface concentration of polymer was given, was possible only when the instantaneous current density (<I>i</I>) was plotted against <I>t</I><SUP>1⁄2</SUP>. In such a potential range, <I>i</I> was expressed as follows.<BR>2& i=i_0-(i_0-i_1)(t/t_m)^1/2 & & for t<I>≤</I>t_m<BR>or & i=i_1 & & for t>t_m<BR>Moreover,<BR>2& \barI_ads/\barI_0=1-\frac1013\fraci_0-i_1i_0(t_d/t_m)^1/2 & & for t_d<I>≤</I>t_m<BR>& \barI_ads/\barI_0=1-\frac1013\fraci_0-i_1i_0-\frac313\fraci_0-i_1i_0{1-(t_d/t_m)^-5/3} & & for t_d>t_m<BR>where <I>i</I><SUB>0</SUB> and <I>i</I><SUB>1</SUB> are the instantaneous current densities at θ=0 and 1, \bar<I>I</I><SUB>ads</SUB> and \bar<I>I</I><SUB>0</SUB> the polarographic currents with and without polymers, <I>t</I><SUB>d</SUB> the drop time, <I>t</I><SUB>m</SUB> the time required to attain the saturated adsorption. The relationship between the shift of half-wave potential and (<I>t</I><SUB>d</SUB>⁄<I>t</I><SUB>m</SUB>)<SUP>1⁄2</SUP> (for <I>t</I><SUB>d</SUB><I>≤t</I><SUB>m</SUB>) or (<I>t</I><SUB>d</SUB>⁄<I>t</I><SUB>m</SUB>)<SUP>−5⁄3</SUP> (for <I>t</I><SUB>d</SUB>><I>t</I><SUB>m</SUB>), was introduced and the results were verified for the inhibition effects of polymer on the electroreduction of BrO<SUB>3</SUB><SUP>−</SUP> as well as for that on VO<SUP>2+</SUP> reduction.
- 公益社団法人 日本化学会の論文
著者
-
Iida Yasuo
Applied Electrochemistry Laboratory, Graduate School of Science and Engineering, Waseda University
-
Iida Yasuo
Applied Electrochemical Laboratory, Graduate School of Science and Engineering, Waseda University
-
Ohsaka Tetsuya
Applied Electrochemistry Laboratory, Graduate School of Science and Engineering, Waseda University
-
Yoshida Tadashi
Applied Electrochemistry Laboratory, Graduate School of Science and Engineering, Waseda University
-
Ohsaka Tetsuya
Applied Electrochemical Laboratory, Graduate School of Science and Engineering, Waseda University
-
Yoshida Tadashi
Applied Electrochemical Laboratory, Graduate School of Science and Engineering, Waseda University
関連論文
- Inhibition Effects of Some Polymers on Electroreduction of Anions at the Mercury/Solution Interface
- Adsorption of Organic Polymers on Platinum Electrode
- Adsorption of Polyethyleneglycol at the Mercury/Solution Interface
- Adsorption and Inhibition Effect of Triton X at the Mercury/Solution Interface
- The Adsorption of Polyvinylpyrrolidone at the Mercury/Solution Interface
- Competitive Adsorption of Polyvinylpyrrolidone with n-Alkyl Alcohols at the Mercury/Solution Interface
- The Determination of the Diffusion Coefficient and the Maximum Surface Concentration of Polyvinylpyrrolidone by Means of a Hanging Mercury Drop Electrode