Studies in hydrogen overvoltage at high current densities: part IV—the influence of concentration, anions, temperature and catalytic poisons

The Apparent Adsorption of Some Aliphatic Compounds from Aqueous Solutions as Inferred from Hydrogen Overvoltage Measurements

“…Aecwding to o\>r definition of overvoltaget E = *>^ ^ Ejj (10) Combining ec^ations (9) and (10) gives us The stoichiometry number arises by considering an unspecified rate determining step from the theory of absolute reaction rates (3U)» Essentially this theory vras followed in the development of the alow discharge mechanism of overvoltage} however, the ^eory naa modified to the particular slow discharge mechaniui by considering that only one electron is involved in the rate determining step. To release one molecule of l^fdrogen requires the over-all z>eac^on to involve two electrons} therefore, the passage of one unit of reactants in the rate determining tp step to obtain one aolecule of l^drogen involTes -4^ electron charges nhere A is the stoiehloraetty number* Equation ( …”

Electrode Materials in Modern Organic Electrochemistry

“…Overpotential is also influenced by supportingelectrolyte, [93] solvent, [99,[111][112][113] current density, [95,96] concentration, [114] temperature, [115] and any additives, [21,[116][117][118][119] ,which will all affect the direct application of these figures. a Hydrogen evolution (HER) overpotential recorded at 1mAcm À2 ,258 8C, 1 m HCl (or H 2 SO 4 )i nt he solvent specified, unless otherwise indicated.…”

Electrode Materials in Modern Organic Electrochemistry

“…Overpotential is also influenced by supporting electrolyte, solvent, current density, concentration, temperature, and any additives,, which will all affect the direct application of these figures. a Hydrogen evolution (HER) overpotential recorded at 1 mA cm −2 , 25 °C, 1 m HCl (or H 2 SO 4 ) in the solvent specified, unless otherwise indicated.…”

“…Thes tability of an electrode is important for ensuring longevity of use.However,the stability of the substrate or the intermediates produced on the electrode is also important for ensuring high yields of product. Acompound can irreversibly bind and decompose on the surface,l eading to ad ecreased Overpotential is also influenced by supportingelectrolyte, [93] solvent, [99,[111][112][113] current density, [95,96] concentration, [114] temperature, [115] and any additives, [21,[116][117][118][119] ,which will all affect the direct application of these figures. a Hydrogen evolution (HER) overpotential recorded at 1mAcm À2 ,258 8C, 1 m HCl (or H 2 SO 4 )i nt he solvent specified, unless otherwise indicated.…”