Hydrogen Oxidation on a Platinum Microelectrode: Effect of Carbon Monoxide Impurities

Author： Maiorova N. A.   Khazova O. A.   Tarasevich M. R.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1023-1935

Source： Russian Journal of Electrochemistry, Vol.40, Iss.10, 2004-10, pp. : 1060-1065

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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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