Issue 24, 2024

Deciphering interfacial charge transfer mechanisms in electrochemical energy systems through impedance spectroscopy

Abstract

Electrochemical energy conversion and storage systems have become an integral part towards a sustainable future, where the goal is to achieve high energy efficiency for each targeted application. The output of these devices is governed by the material design and the underlying interfacial chemistry at the junction of the electrode and the electrolyte. Electrochemical impedance spectroscopy (EIS) is based on the response of applied frequency to the modulated potential and the decoupled capacitive and resistive components. It has emerged as a versatile non-destructive analytical tool endowed with the benefits of differentiating between multiple solid/electrolyte and solid/solid interfaces. In this perspective, the model-based and model-free approaches are elaborated along with relevant case studies for elucidating the charge transfer at multiple interfaces for water electrolysis, CO2 and N2 reduction to value-added fuels, and ammonia, respectively, in addition to the metal-ion, metal-air and photo-rechargeable batteries. The avenues to minimize the charge transfer resistance for boosting the overall device performance are also discussed.

Graphical abstract: Deciphering interfacial charge transfer mechanisms in electrochemical energy systems through impedance spectroscopy

Article information

Article type
Perspective
Submitted
24 Janv. 2024
Accepted
08 Maijs 2024
First published
08 Maijs 2024

J. Mater. Chem. A, 2024,12, 14334-14353

Deciphering interfacial charge transfer mechanisms in electrochemical energy systems through impedance spectroscopy

K. Panigrahi, S. Mal and S. Bhattacharyya, J. Mater. Chem. A, 2024, 12, 14334 DOI: 10.1039/D4TA00537F

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