Abstract
This work presents the performance of an electrochemical hydrogen compressor (EHC) as a function of the operating temperature, T (30 °C and 80 °C) and relative humidity, RH (100% and 50%), with the application of the current densities of 0.1 A/cm2, 0.3 A/cm2, and 0.5 A/cm2 and for a study period of 2 h. It was possible to determine the voltage, compression time, actual work, ideal work and energy efficiency at each of the variations of these parameters for a study pressure of up to 50 bar. The best performance conditions were obtained for a temperature of 30 °C and 100% RH, resulting in energy efficiency of 40% applying 0.1 A/cm2. The worst performance was presented by varying the operating conditions at 80 °C and 50% RH, obtaining energy efficiency of 0.18% using 0.5 A/cm2. It was also possible to measure the hydrogen backdiffusion phenomenon at different relative humidities and temperatures.
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