Fig. 2From: Hydrogen production from water electrolysis: role of catalystsa Schematic illustration of the catalyst’s role in lowering the activation energy barrier; b–d schematic illustrations of the performance evaluation parameters of electrocatalyst, including, b activity in terms of overpotential, Tafel slope, and exchange current density, c stability in terms of current- and potential-time curves, and d efficiency in terms of faradaic efficiency and turnover frequencyBack to article page