Redox reactions of hydrosulphide ions on the platinum electrode—I. The presence of intermediate polysulphide ions and sulphur layers

Oscillatory instabilities during the electrochemical oxidation of sulfide on a Pt electrode

“…It is obvious that the strong adsorption of sulfide on the Pt electrode surface inhibits hydrogen adsorption. The small peak centered at À0.08 V corresponds to the oxidation of S adsorbate [9,18]. Fig.…”

“…Electrochemical oxidation of aqueous and gaseous sulfide for detection and removal/ conversion of sulfide species [4][5][6][7] has garnered significant attention, being less expensive and more easily controlled. The electrochemical behavior of sulfide has been widely investigated using different electrode materials, including platinum [8][9][10][11][12], graphite [4][5][6]13,14], gold [15] and Ti/ Ta 2 O 5 -IrO 2 oxide electrodes [16]. The formation of a sulfur layer on the electrode surfaces as well as the production of polysulfides is observed during the anodic oxidation of sulfide.…”

Study of a high power density sodium polysulfide/bromine energy storage cell

“…Szynkarczuk reported that polysulfide could be oxidized to elemental sulfur at a platinum electrode. The formation of a layer of sulfur film could significantly reduce the rate of electrochemical reaction [15]. The dissolution rates of sulfur in sulfide and lower polysulfide compounds increase with increasing temperature.…”

“…Most of the electrodes for the polysulfide redox system are based on metallic sulfide [4,[6][7][8][9], carbon composition [10][11][12] and novel metals [13][14][15]. Only a modest current density of 10-20 mA cm À2 at less than 50 mV overpotential was obtained for catalytic electrode surface layers of cobalt and MoS 2 [7].…”

“…For the reduction of sulfur at 40 mA cm À2 the overpotential was 40-75 mV [11]. Elemental sulfur may be formed during the oxidation of polysulfide ions and the deposited sulfur has a considerable effect on the electrode performance [13][14][15]. The electrodes for the Br 2 /Br À redox couple are mainly based on carbon [16,17] and platinum [18].…”