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Complex behaviour of isotopes in CO2 electroreduction

Isotope labelling with 13C-carbon has become a popular technique used to understand carbon dioxide electroreduction mechanisms. However, isotopes of carbon exhibit complex selectivity effects, which need to be carefully considered in the experimental design to avoid misinterpretations.

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Fig. 1: Kinetic isotope effects on electrochemical interfaces.
Fig. 2: Recommended experimental procedures for carbon labelling experiments.
Fig. 3: 13C discrimination effect in CO2R under high current density.

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Acknowledgements

The author acknowledges Northeastern University’s start-up grant and A. J. Sanz Guillen for improving the paper’s visual content quality.

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Correspondence to Magda H. Barecka.

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The author of this manuscript is a co-inventor of a patent application US2024/0286078A1, which describes an electrochemical method for 13C carbon isotope separation, and a co-inventor on a patent on a new generation of electrochemical reactors US PRV 63/669,089. The author is a member of the advisory board of the journal iScience.

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Nature Catalysis thanks the anonymous reviewers for their contribution to the peer review of this work.

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Barecka, M.H. Complex behaviour of isotopes in CO2 electroreduction. Nat Catal 8, 513–517 (2025). https://doi.org/10.1038/s41929-025-01360-3

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