Abstract
Kinetics of processes occurring at H+/solid electrolyte/Pt, H2 three-phase interface are studied subject to the platinum content on the electrode. The study was performed with model electrochemical cells PbO2/H3PW12O40/Pt with different platinum content at the working electrode that consisted of platinum deposited onto the E-Tek LT1200-N carbon-nanotubes paper. On the basis of the obtained results, the occurring processes were practically fully separated. It is shown by the analyzing of relaxation curves that there exist at least two processes in the system: the faster one corresponds to the hydrogen reaction; the slower, to the oxygen one. The rates of both processes depend on the platinum content at the working electrode; they have an extreme at the platinum concentration of 0.5 mg/cm2. Impedance data allowed revealing the processes’ limiting stages. The experimental data allowed suggesting that at low platinum content the relaxation time is determined by the electrochemical reaction rate; at higher content, by gas diffusion through the platinum dense layer.
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Original Russian Text © A.V. Levchenko, A.E. Ukshe, A.A. Fedotova, 2011, published in Elektrokhimiya, 2011, Vol. 47, No. 6, pp. 776–782.
After the paper delivered at the 10th Meeting “Basic Problems of Solid State Ionics”, Chernogolovka, 2010.
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Levchenko, A.V., Ukshe, A.E. & Fedotova, A.A. Kinetics of processes occurring at a H3PW12O40/Pt, H2 interface depending on the platinum content on the electrode. Russ J Electrochem 47, 726–732 (2011). https://doi.org/10.1134/S102319351106005X
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DOI: https://doi.org/10.1134/S102319351106005X