Hydrogen Oxidation on a Platinum Microelectrode: Effect of Carbon Monoxide Impurities |
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Authors: | Maiorova N. A. Khazova O. A. Tarasevich M. R. |
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Affiliation: | (1) Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119071, Russia |
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Abstract: | The kinetics of the hydrogen oxidation and the CO adsorption on a Pt (ultra)microelectrode is studied in a 0.5 M H2SO4 solution saturated with a mixture of gaseous H2 and CO at partial CO pressures pCO = 10–500 ppm. The balance between rates of diffusion and adsorption of CO at different adsorption times is studied. Studied is the effect of CO impurities in H2 on steady-state polarization curves for the hydrogen ionization and nonsteady-state curves of the oxidation current decay with time at 0.02–0.05 V. Conditions under which in a certain time interval and at a certain CO concentration the slope of an I vs. t curve is proportional to pCO are determined. The obtained dependence may be used when designing a technique for monitoring CO impurities in technical hydrogen. |
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Keywords: | microelectrode electrocatalysis hydrogen oxidation CO adsorption CO impurities in hydrogen monitoring of technical hydrogen |
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