Performance and long-term stability of CO2 conversion to formic acid using a three-compartment electrolyzer design

Yang, Hongzhou; Kaczur, Jerry J.; Sajjad, Syed Dawar; Masel, Richard I.

doi:10.1016/j.jcou.2020.101349

Performance and long-term stability of CO₂ conversion to formic acid using a three-compartment electrolyzer design

Journal Article · Fri Oct 30 00:00:00 EDT 2020 · Journal of CO2 Utilization

DOI:https://doi.org/10.1016/j.jcou.2020.101349· OSTI ID:1700693

Yang, Hongzhou ^[1]; Kaczur, Jerry J. ^[2]; Sajjad, Syed Dawar ^[2]; ^[2]

Dioxide Materials, Inc., Boca Raton, FL (United States); Dioxide Materials, Inc
Dioxide Materials, Inc., Boca Raton, FL (United States)

The electrochemical reduction of CO₂ to formate and formic acid has attracted a great amount of academic and commercial interest over the past five years. A number of experimental studies have generated data on the Faradaic performance and stability of various candidate catalyst materials in producing formate or formic acid. However, most of the data has been conducted at low current densities and over short time periods, typically hours to days. There is a critical need in providing long-term catalyst stability as well as electrolyzer-based operating data, which are needed for the commercial scale-up and operation of this technology, especially at high current densities. In this paper, the electrochemical CO₂ conversion to pure formic acid was conducted using a three-compartment design electrolyzer, demonstrating electrolyzer catalyst and performance stability for over 1000 h at current densities up to 200 mA cm^-2. Depending on the operation conditions, the electrolyzer directly produced a 6.03 to 12.92 wt% (1.3 to 2.8 M) formic acid product at Faradaic efficiencies ranging between 73.0 to 91.3%. Data on electrolyzer performance, including formic acid product generation rate, energy efficiency, and energy consumption are reported at three different current densities, 100, 200, and 250 mA cm^-2. Finally, a long term 1000 h electrolyzer stability run at 200 mA cm^-2 is presented, providing information on the operating conditions required in obtaining stable electrolyzer performance. All the data will be extremely useful in the commercial scale-up of this technology.

View Accepted Manuscript (DOE)

Research Organization:: Dioxide Materials, Inc., Boca Raton, FL (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE), Clean Coal and Carbon Management

Grant/Contract Number:: FE0031706

OSTI ID:: 1700693

Alternate ID(s):: OSTI ID: 1780545

Journal Information:: Journal of CO2 Utilization, Journal Name: Journal of CO2 Utilization Vol. 42; ISSN 2212-9820

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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10 SYNTHETIC FUELS
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Performance and long-term stability of CO2 conversion to formic acid using a three-compartment electrolyzer design

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Performance and long-term stability of CO₂ conversion to formic acid using a three-compartment electrolyzer design