Hydrogen Evolution Reaction of Electrodeposited Ni-W Films in Acidic Medium and Performance Optimization Using Machine Learning.

A measurement at OCP was also included, yielding considerably higher impedance and reaching a phase shift close to −80° indicating strong capacitive behavior (Figure 9b ). After the fitting of the EIS data using a simplified Randles circuit as the equivalent circuit, [45] and the determination of the solution resistance (R s ), charge‐transfer resistance (R ct ) and double‐layer capacitance (C dl ) as described in the experimental section, a clear trend in decreasing R ct with increasing absolute value of the cathodic current density is observed, showing that the surface becomes more active (Table 4 ).

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