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Effect of the Supporting-Electrolyte Cation on the Chloroplatinite Ion Reduction at a Dropping Mercury Electrode

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Abstract

The effect of nature and concentration of supporting-electrolyte cations (Li+, Na+, Cs+, (CH3)4N+, Ca2+, Ba2+) on electroreduction kinetics of PtCl2- 4at a dropping mercury electrode is studied. The electroreduction wave for PtCl2- 4is complicated by a polarographic maximum of first kind followed by a pronounced plateau of limiting current, after which the current passes through a minimum. The electroreduction occurs probably via two different mechanisms and presumably involves the same species, because the charge z iof discharging species, determined by the Frumkin–Petrii method, remains virtually constant (z i≅ –1) on both descending (E= –0.6 to –1.0 V vs. SCE) and ascending (–1.3 to –1.6 V) branches of polarization curves and is independent of the nature of the supporting-electrolyte cation. The mechanism is presumably changed by a changed orientation of discharging species relative to the electrode surface.

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Authors and Affiliations

  1. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199164, Russia

    M. M. Bezruchko, E. G. Tsventarnyi & V. V. Malev

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  1. M. M. Bezruchko
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  2. E. G. Tsventarnyi
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  3. V. V. Malev
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Bezruchko, M.M., Tsventarnyi, E.G. & Malev, V.V. Effect of the Supporting-Electrolyte Cation on the Chloroplatinite Ion Reduction at a Dropping Mercury Electrode. Russian Journal of Electrochemistry 37, 1189–1196 (2001). https://doi.org/10.1023/A:1012719716782

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