Development of an automatic calculation of the temperature gradient in Sieverts apparatus for testing sorption properties of hydrogen storage materials

This paper discusses the optimization of the Sieverts-type apparatus with the goal of achieving precise measurements of the interaction between hydrogen and materials using volumetric methods. In order to obtain accurate and reliable measurements of sorption and desorption kinetics in hydrogen storage materials, it is important to reduce the effects of temperature gradients within the Sieverts-type apparatus. Two methods were developed to minimize the impact of temperature gradients on hydrogen measurements. The first method involved segmenting the gas path and measuring the temperature in each section. The second method utilized the total volume of the gas path, divided into two dynamic volumes for hot and cold sections. Experimental equations were derived to calculate the hydrogen content, taking into account the effects of temperature gradient, for both methods. These methods were then implemented, and the results were compared. The most successful result was obtained using the second method, with the maximum deviation of 0,1% of the initial gas volume.

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