Determination of Activation Energy on Hydrogen Evolution Reaction for Nickel-Based Porous Electrodes during Alkaline Electrolysis

The aim of the present work is to evaluate activation energy (Ea) at different cathodic overpotentials (η) by potentiodynamic tests which were carried out temperatures Ni-based, NiCr-m, and NiCr-p porous electrodes, during alkaline electrolysis processes. On other hand, electrochemical stability electrodes was evaluated cyclic voltammetry after 1000 cycles operation potentiostatic 10 h −1.5 V vs. SCE. sintered with a heating rate 25 °C/min up temperature °C (Ni-based NiCr-m) 1200 (NiCr-p) for 60 min. results showed that Ea value lower Ni-based system equilibrium; however, electrode had better performance due higher negative apparent values as function η (dEa/dη). suggest improves its activity about 71% in long-term comparison NiCr-m. A similar behavior observed test current density associated charge transfer process h. attributed homogeneous Cr distribution nickel matrix.