Comparative voltammetric behaviour of H- and O-atoms on a Pt electrode in sulphuric acid solutions within the 293 K to 233 K range

Electrochemical Conversion of CO2 and CH4 at Subzero Temperatures

“…The irreversibility of the hydrogen adsorption/desorption as a function of the temperature contrasts with previous results by Arvia et al , in concentrated sulfuric and perchloric acid. This can be attributed to the large difference in proton concentrations between the concentrated acid solutions and the Mg­(ClO 4 ) 2 brines used in this work.…”

Reactions involving H, OH and O species on rhodium in H2SO4·12H2O and HClO4·5.5H2O in the range 198–298 K

“…A three-electrode glass electrochemical cell (as described elsewhere [4]) was used. The working electrode consisted of a polycrystalline Rh wire (Johnson Matthey, 99.998% purity, either 0.63 or 0.53 cm 2 in geometric area).…”

“…The effect of temperature on the kinetics of electrochemical reactions has been studied during the last decades, particularly to evaluate the temperature dependence of Tafel slopes and its relation to electron transfer theory [1]. More recently, the hydrogen electrode reaction (HER) on Pt in HC104 -5.5H20 in the range 189-292 K [2,3] and the voltammetric behaviour of H and O adatoms on Pt in HzSO 4 • 12H20 and HCIO 4 • 5.5H20 in the range 189-292 K [4,5] have received special consideration. Although restricted to Pt, these results are highly interesting when exploring new aspects related to the structure of the metal Isolution interface in relation to the kinetics of electrocatalytic processes.…”