Tuning the Interfacial Reaction Environment for CO 2 Electroreduction to CO in Mildly Acidic Media

A considerable carbon loss of CO2 electroreduction in neutral and alkaline media severely limits its industrial viability as a result of the homogeneous reaction of CO2 and OH– under interfacial alkalinity. Here, to mitigate homogeneous reactions, we conducted CO2 electroreduction in mildly acidic media. By modulating the interfacial reaction environment via multiple electrolyte effects, the parasitic hydrogen evolution reaction is suppressed, leading to a faradaic efficiency of over 80% for CO on the planar Au electrode. Using the rotating ring-disk electrode technique, the Au ring constitutes an in situ CO collector and pH sensor, enabling the recording of the Faradaic efficiency and monitoring of…

• NO
  Nederlandse Organisatie voor Wetenschappelijk Onderzoek
• TS
  Tata Steel
• MI
  Materials innovation institute

  Awards: PS.IPP.019.002, ENP-PS.IPP.019.002
• TS
  Tata Steel Nederland