Electrochemical behavior of dissolved hydrogen at Pt electrode surface in a high temperature LiOH–H3BO3 solution: Effect of chloride ion on the transient current of the dissolved hydrogen
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The electrochemical behavior of dissolved hydrogen (H2) was investigated at a Pt electrode in a high temperature LiOHeH3BO3 solution. The diffusion current of the H2 oxidation was proportional to the concentration of the dissolved H2 as well as the reciprocal of the temperature. In the polarization curve, a potential region in which the oxidation current decreases despite an increase in the applied potential between the H2 oxidation and the water oxidation regions was observed. This potential region was interpreted as being caused by the formation of a Pt oxide layer. Using the properties of the Cl ion that reduces the growth rate of the Pt oxide layer, it was confirmed that there is a correlation between the Cl ion concentration and the transient current of the H2 oxidation.
Abstract
The electrochemical behavior of dissolved hydrogen (H2) was investigated at a Pt electrode in a high temperature LiOHeH3BO3 solution. The diffusion current of the H2 oxidation was proportional to the concentration of the dissolved H2 as well as the reciprocal of the temperature. In the polarization curve, a potential region in which the oxidation current decreases despite an increase in the applied potential between the H2 oxidation and the water oxidation regions was observed. This potential region was interpreted as being caused by the formation of a Pt oxide layer. Using the properties of the Cl ion that reduces the growth rate of the Pt oxide layer, it was confirmed that there is a correlation between the Cl ion concentration and the transient current of the H2 oxidation.
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