Work

Advanced Impedance Analysis for Performance Degradation during Low-Temperature CO 2 Electroreduction

Year: 2024

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Electrochemical impedance spectroscopy (EIS) is a powerful tool commonly used to study electrochemical systems. Nevertheless, its application in CO 2 electroreduction has been so far limited due to its complex reaction mechanism and environment. Although initial findings have demonstrated the viability of applying EIS analysis in CO 2 electrolyzers, the assignment of individual processes in the impedance spectra remains ambiguous. Therefore, a more detailed investigation, especially focused on its application in evaluating degradation mechanisms, is essential. In this study, a stable gas diffusion electrode (GDE) system was developed for a comprehensive EIS and distribution of relaxation time (DRT) evaluation to assess key degradation mechanisms under accelerated stress conditions such as high current density and low operating temperature. Validated by post-mortem analysis and complementary methods, we demonstrate the viability of this approach for operando monitoring of CO 2 electroreduction by assigning individual mechanistic processes in the GDE and linking them to performance degradation over time.

Source: ACS Energy Letters

DOI: 10.1021/acsenergylett.4c02673

Authors: Qinhao Chen, Alexander Kube, Dennis Kopljar, Kaspar Andreas Friedrich

Institutions: University of Stuttgart, Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

Language: English

Topic: CO2 Reduction Techniques and Catalysts

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDGs: Affordable and clean energy, Climate action

Open Access status: hybrid

Estimated APC paid: $4,500