Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.049
Publication date: 18th July 2023
In this talk, I will summarize various results on CO electroreduction to the C2 species ethylene, ethanol and acetaldehyde on Cu-based catalysts.
I will start presenting a pathway for CO electroreduction to ethylene, ethanol and acetaldehyde [1]. An early intermediate in this pathway can be spectroscopically detected, and DFT helps elucidate its structure [2].
Moreover, the pathway predicts that the late stages of ethanol production correspond to the reduction of acetaldehyde [3], while the late stages of ethylene production coincide with the reduction of ethylene oxide [4]. Because these two reactions have different structural sensitivity, one can elucidate the structure of ethanol-producing sites on the rough surface of oxide-derived Cu [5].
Finally, previous work postulated that a *CHO dimer is part of the CO reduction pathway to ethanol [6]. We put that idea to the test by electroreducing glyoxal and determined that the *CHO dimer is unlikely to be a key intermediate of that pathway [7].
Time permitting, I will show that Ag-Cu tandem catalysts open an alternative, ethanol-selective pathway by virtue of their large surface coverage of *CO [8, 9], the structure sensitivity of which can be capitalized on to design active catalysts [10].
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