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Updated: Jun 10, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Catalytic Impedance Spectroscopy: Concept and Application on CO2 Methanation
Andreas Borgschulte1,2, Marco Achermann3, Marin Nikolic1,2
1Empa─Swiss Federal Laboratories for Materials Science and Technology, Laboratory Chemical Energy Carriers and Vehicle Systems Laboratory, Überlandstrasse 129, CH 8600 Dübendorf, Switzerland.
Abstract:
Complex modeling of periodic excitation combined with time-resolved product detection is used to describe the complex response function of a catalytic system. We describe this concept of catalytic impedance spectroscopy (CIS) and the underlying general experimental approach and a concrete setup. The feasibility of CIS is experimentally demonstrated along the catalytic CO2 methanation reaction. The measurements confirm the theoretically anticipated rate-determining step of HCO* → CH* on Ni catalysts. Limitations and prospects of CIS to unravel reaction mechanisms are discussed.
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