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Title: A scalable membrane electrode assembly architecture for efficient electrochemical conversion of CO2 to formic acid

Journal Article · · Nature Communications
ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [2];  [2];  [1]; ORCiD logo [2];  [3];  [1]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [2];  [2]; ORCiD logo [1]
  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

The electrochemical reduction of carbon dioxide to formic acid is a promising pathway to improve CO2 utilization and has potential applications as a hydrogen storage medium. In this work, a zero-gap membrane electrode assembly architecture is developed for the direct electrochemical synthesis of formic acid from carbon dioxide. The key technological advancement is a perforated cation exchange membrane, which, when utilized in a forward bias bipolar membrane configuration, allows formic acid generated at the membrane interface to exit through the anode flow field at concentrations up to 0.25 M. Having no additional interlayer components between the anode and cathode this concept is positioned to leverage currently available materials and stack designs ubiquitous in fuel cell and H2 electrolysis, enabling a more rapid transition to scale and commercialization. The perforated cation exchange membrane configuration can achieve >75% Faradaic efficiency to formic acid at <2 V and 300 mA/cm2 in a 25 cm2 cell. More critically, a 55-hour stability test at 200 mA/cm2 shows stable Faradaic efficiency and cell voltage. Technoeconomic analysis is utilized to illustrate a path towards achieving cost parity with current formic acid production methods.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Bioenergy Technologies Office (BETO); USDOE
Grant/Contract Number:
AC36-08GO28308; AC02-06CH11357; AC05-00OR22725
OSTI ID:
2217556
Alternate ID(s):
OSTI ID: 2228672; OSTI ID: 2278906; OSTI ID: 2481272
Report Number(s):
NREL/JA-5900-85814; MainId:86587; UUID:1c6e2981-ec3e-4ea4-8056-5eea034431b9; MainAdminID:71207
Journal Information:
Nature Communications, Vol. 14, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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