Theoretical analysis of relative diffusion impedance in finite layer: Spiral-shaped Nyquist plots in electrochemical impedance spectroscopy

Abstract

The spiral shape is ubiquitous in everyday life, and the spiral is also present in electrochemical impedance spectroscopy. By analyzing the diffusion of two ions in the opposite direction in the finite layer, the relative diffusion impedance equation can be obtained and used to simulate a series of different shapes of the Nyquist plots, including spiral shapes. In this paper, the variation law of the spiral Nyquist plot under different conditions is analyzed, and the application of the relative diffusion impedance equation in the area of thin-film solar cells and hydrogen permeation is discussed.

A graphene-like hollow sphere anode for lithium-ion batteries

“…The semicircle denotes the electrode surface charge transfer resistance (R ct ), while the diagonal line corresponds to the charge diffusion resistance within the electrode. 29,30 The resistance value of the material is determined by fitting the equivalent circuit model, as detailed in Table S2 and Fig. S4 (see ESI †).…”