Revisiting Electrochemical Reduction of CO2 on Cu Electrode: Where Do We Stand about the Intermediates?

Aamir Hassan Shah, Yanjie Wang, Abebe Reda Woldu, Lin Lin, Muzaffar Iqbal, David Cahen, Tao He

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Electrochemical CO2 reduction on Cu electrode has attracted the attention of many researchers in the last decades, because of its potential to generate significant amounts of hydrocarbons at high reaction rates over sustained periods of time. As a result, substantial effort has been devoted to determining the unique catalytic performance of Cu and to elucidate the mechanism through which hydrocarbons are formed. Here we report new insights into CO2 reduction on Cu by electrochemical impedance spectroscopy (EIS) in terms of adsorption/desorption of the reduction intermediates. The potential dependence of charge transfer kinetics is discussed on the basis of EIS results. We revisit the mechanism of the formation of hydrocarbons, taking into account the pH adjacent to the electrode surface, adsorption of HCO3 - and CO3 2-, and the role of active hydrogen. In addition to the enol-like intermediate, proposed previously, we proposed that∗COOH radicals, originating from the active involvement of HCO3 - and/or CO3 2- upon reduction are key intermediates for the formation of a variety of C2 and C3 products. Thus, our results provide an additional crucial guideline for the design of future catalysts that can efficiently and selectively reduce CO2 into value-added chemicals.

Original languageEnglish
Pages (from-to)18528-18536
Number of pages9
JournalJournal of Physical Chemistry C
Issue number32
StatePublished - 16 Aug 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.


Dive into the research topics of 'Revisiting Electrochemical Reduction of CO2 on Cu Electrode: Where Do We Stand about the Intermediates?'. Together they form a unique fingerprint.

Cite this