The Tafel slope is typically obtained from Tafel plots, which are generated by plotting the overpotential (η) against the logarithm of the current density (log j). The slope of the linear portion of this plot, usually in the low overpotential region, is the Tafel slope. The Tafel equation is generally expressed as:
\[ \eta = a + b \log j \]
where η is the overpotential, j is the current density, and b is the Tafel slope.
