Carbon electrodes: Part 1. Hydrogen evolution in acidic solution

Hydrogen evolution reaction on spheroidal graphite cast iron with different pearlite areas in sulphuric acid solutions

“…Despic et al, and Brennan measured polarisation curves of pyrolytic graphite, glassy graphite and graphite powder in acid solution of pH=1.0 respectively. 26,27 These experimental results on graphite are summarised that the exchange current densities are in the range of 10 29 -10 28 A cm 22 for the different crystallographic planes of graphite and the Tafel slopes are between 20?12 and 20?18 V/decade. The exchange current densities on graphite are two or three orders of magnitude lower than those on iron.…”

Novel, Highly Conductive Pt/TiO2 Thin‐Film Model Catalyst Electrodes: The Role of Metal–Support Interactions

“…Note that, the applied maximum cathodic potential is about 0.30 V more cathodic than that used in most other studies, [19;31] which is only possible because of the high overpotential of the substrate material GC for the H2 evolution reaction (HER). [32] The Pt substrate used in the work of Dziewoński and Grzeszczuk, [19] for example, would lead to enormous H2 evolution in this potential region. The same is true for other metal substrates [33][34][35] and also for the often used ITO (indium tin oxide) [25;30;31;36] or FTO (fluorine doped tin oxide) [37] covered conducting glass electrodes, where the amount of evolved hydrogen is lower than for the metal ones, but still much higher compared to glassy carbon.…”

Hydrogen Evolution Reaction on Spheroidal Graphite Cast Iron with Different Graphite Areas in Sulfuric Acid Solutions

“…Despic et al and Brennan measured polarization curves of pyrolytic graphite and glassy graphite in acid solutions of pH = 1.0. [22][23][24] These experimental results on graphite are summarized that the exchange current densities are in the range of 10 ¹9 to 10 ¹7 A cm ¹2 for the different crystallographic planes of graphite and the Tafel slopes are between ¹0.12 and ¹0.18 V/ decade. The cathodic current density of graphite at E = ¹0.5 V and pH = 1.0 is estimated to be between 10 ¹7 to 10 ¹4 A cm ¹2 .…”