Distribution of Relaxation Times (DRT): An Introduction

The Distribution of Relaxation Times (DRT) is a powerful method for analyzing electrochemical impedance data. It visualizes time constants without requiring prior knowledge of an equivalent circuit. This white paper explains the theoretical background, demonstrates the method using simulated data, and compares numerical and analytical results. DRT is especially useful when multiple processes with similar time constants are present—it can resolve them more clearly than traditional Nyquist plots. Limitations include poor suitability for data with inductive behavior or strong diffusion, which require preprocessing. Overall, DRT offers an intuitive way to interpret complex electrochemical systems, making it ideal for research and development in laboratory settings.