Effect of the Supporting-Electrolyte Cation on the Chloroplatinite Ion Reduction at a Dropping Mercury Electrode |
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Authors: | Bezruchko M M Tsventarnyi E G Malev V V |
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Institution: | (1) St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199164, Russia |
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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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