Decreasing the Energy Consumption of the CO2Electrolysis Process Using a Magnetic Field

Saket S. Bhargava, Daniel Azmoodeh, Xinyi Chen, Emiliana R. Cofell, Anne Marie Esposito, Sumit Verma, Andrew A. Gewirth, Paul J.A. Kenis

Research output: Contribution to journalArticlepeer-review


The renewable electricity-powered electrolysis of CO2 could be a viable carbon-neutral method for producing carbon-based value-added chemicals like carbon monoxide, formic acid, ethylene, and ethanol. A typical CO2 electrolyzer suffers, however, from the high power requirements, mainly due to the energy-intense anode reaction. In this work, we decrease the anode overpotential and thus reduce the overall cell energy consumption by using a NiFe-based bimetallic catalyst at the anode and applying a magnetic field. For a CO2 electrolysis process producing CO in a gas diffusion electrode-based flow electrolyzer, we demonstrate that power savings in the range from 7% to 64% can be achieved at CO partial current densities exceeding -300 mA/cm2 using a NiFe catalyst at the anode and/or by using a magnetic field at the anode. We achieve a maximum CO partial current density of -565 mA/cm2 at a full cell energy efficiency of 45% with 2 M KOH as the electrolyte.

Original languageEnglish (US)
Pages (from-to)2427-2433
Number of pages7
JournalACS Energy Letters
Issue number7
StatePublished - Jul 9 2021

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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