Determination of dissolved hydrogen and effects of media and electrode materials on the electrochemical oxidation of molecular hydrogen

The electrochemical oxidation of hydrogen at activated platinum electrodes in room temperature ionic liquids as solvents

“…First, an increase of the peak current for H 2 oxidation was observed when the electrode was pre-anodized (''activated") at a potential more positive than the peak. A similar effect had also been noted in aprotic solvents in the presence of H 2 on Pt electrodes [25]. Second, after activating the electrode for 1 min, the voltammetry became much more electrochemically reversible.…”

“…Several reports have looked at the H 2 oxidation process in both protic [21][22][23][24] and aprotic [25,26] solvents. Recently, we extended this study by looking at the electro-oxidation of H 2 in a limited range of RTILs [14] in order to shed light on the nature of proton-ionic liquid interactions, and noted some interesting observations.…”

Ionic Liquid as an Alternative Greener Sensing Medium for the Chemical Warfare Agent

“…In Figure 1Aa two peaks are observed during the forward scan at 1.14 V (6.5 mA) and 1.47 V (12.1 mA) in RTIL and the reverse scan also exhibited one peak at þ 0.53 V (3.4 mA). These peaks are probably due to the formation of platinum oxide on the electrode surface as reported earlier in a RTIL and aprotic solvent [20,25]. However, after the addition of 5.88 Â 10 À4 M NM-2 (Figure 1Ab), three peaks were observed in the forward scan at 1.13 Vand 1.47 Vas in the case of RTIL and a new peak at 1.68 V with huge peak current.…”

“…To further confirm the NM-2 oxidation peak, log i vs. log v graph was plotted ( Figure 1E) and the slope value was found to be 1.10, this confirms involvement of an adsorption controlled process during the oxidation [27]. The plot of E p versus ln v is exhibiting linear relationship as shown in Figure 1F for the potential scan rate ranging from 25 …”

Electrochemical Detection for Gaseous Vinyl Chloride with a Sputtered Au/Porous Alumina Substrate/Pt Electrode Assembly

“…They demonstrated that changes in the solvent composition and supporting electrolyte concentration yielded different limiting currents for the same concentration of electroactive species because of change in the diffusion coefficient of the electroactive species, accompanied by the change in the medium viscosity. Furthermore, the gaseous electroactive species, hydrogen and oxygen, were dissolved into the organic medium and analyzed [4,5]. Hahn and co-workers [6,7] used a gold microdisk electrode to investigate the detection of O 2 and CO 2 in gaseous phase by using solvent of dimethyl sulfoxide (DMSO), containing supporting electrolyte of 0.1 M Bu 4 NClO 4 .…”