Abstract
Hydrogen sorption into palladium limited volume electrode (Pd-LVE) was studied in protic ionic liquid – diethylmethylammonium triflate (DEMA-TFO) using cyclic voltammetry (CV), chronopotentiometry (CP) and chronoamperometry (CA) at constant temperature (298 K). Pd-LVE was obtained potentiostatically from the aqueous solution of PdCl2. The results were compared with those obtained in aqueous 0.5 M H2SO4 solution. As the process of hydrogen sorption in ionic liquid medium is much less reversible than in acidic aqueous solution – the hydrogen pretreatment procedure (HPP) significantly increases the reversibility of this process at temperature of 298 K. The amount of absorbed hydrogen in DEMA-TFO is comparable with this in aqueous solution of acid and reaches the maximum value of H/Pd ca. 0.7. The hydrogen absorption isotherm was measured with the use of CV and CP techniques.
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