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Electro-activated indigos intensify ampere-level CO2 reduction to CO on silver catalysts
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Journal Article
Electro-activated indigos intensify ampere-level CO2 reduction to CO on silver catalysts
2025
Overview
The electrochemical reduction of carbon dioxide (CO
2
) to carbon monoxide (CO) is challenged by a selectivity decline at high current densities. Here we report a class of indigo-based molecular promoters with redox-active CO
2
binding sites to enhance the high-rate conversion of CO
2
to CO on silver (Ag) catalysts. Theoretical calculations and in situ spectroscopy analyses demonstrate that the synergistic effect at the interface of indigo-derived compounds and Ag nanoparticles could activate CO
2
molecules and accelerate the formation of key intermediates (*CO
2
–
and *COOH) in the CO pathway. Indigo derivatives with electron-withdrawing groups further reduce the overpotential for CO production upon optimizing the interfacial CO
2
binding affinity. By integrating the molecular design of redox-active centres with the defect engineering of Ag structures, we achieve a Faradaic efficiency for CO exceeding 90% across a current density range of 0.10 − 1.20 A cm
–2
. The Ag mass activity toward CO increases to 174 A mg
–1
Ag
. This work showcases that employing redox-active CO
2
sorbents as surface modification agents is a highly effective strategy to intensify the reactivity of electrochemical CO
2
reduction.
It is challenging to maintain the CO selectivity under high current densities in CO
2
electro-reduction process. Here the authors report the synergistic interface between redox active CO
2
organic sorbents and defective Ag catalysts that can enable an ampere level CO
2
-to-CO conversion.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Springer Science and Business Media LLC,Nature Portfolio
Subject
