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Title: Acetaldehyde as an intermediate in the electroreduction of carbon monoxide to ethanol on oxide-derived copper

Oxide-derived copper (OD-Cu) electrodes exhibit unprecedented CO reduction performance towards liquid fuels, producing ethanol and acetate with >50 % Faradaic efficiency at -0.3 V (vs. RHE). By using static headspace-gas chromatography for liquid phase analysis, we identify acetaldehyde as a minor product and key intermediate in the electroreduction of CO to ethanol on OD-Cu electrodes. Acetaldehyde is produced with a Faradaic efficiency of ≈5 % at -0.33 V (vs. RHE). We show that acetaldehyde forms at low steady-state concentrations, and that free acetaldehyde is difficult to detect in alkaline solutions using NMR spectroscopy, requiring alternative methods for detection and quantification. Our results indicate an important step towards understanding the CO reduction mechanism on OD-Cu electrodes.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [1] ;  [4] ;  [5] ;  [6] ;  [1]
  1. Technical University of Denmark, Lyngby (Denmark)
  2. Carlsberg Lab., København V, (Denmark)
  3. Stanford Univ., Stanford, CA (United States)
  4. Carlsberg Lab., København V (Denmark)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Technical University of Denmark, Lyngby (Denmark); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
OSTI Identifier:
1240104
Grant/Contract Number:
AC03-76SF00515
Type:
Accepted Manuscript
Journal Name:
Angewandte Chemie (International Edition)
Additional Journal Information:
Journal Name: Angewandte Chemie (International Edition); Journal Volume: 55; Journal Issue: 4; Journal ID: ISSN 1433-7851
Publisher:
Wiley
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY