期刊
ACS ENERGY LETTERS
卷 7, 期 5, 页码 1712-1718出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.2c00283
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资金
- Natural Sciences and Engineering Research Council of Canada [CRDPJ 536621-18]
- TotalEnergies American Services, Inc. (an affiliate of TotalEnergies SE, France)
- Max Planck-UBC-UTokyo Center for Quantum Materials
- Canada First Research Excellence Fund
- Quantum Materials and Future Technologies Program
- Canadian Foundation for Innovation [229288]
- Canadian Institute for Advanced Research [BSE-BERL162173]
- Natural Sciences and Engineering Research Council of Canada
- Killam doctoral fellowships
- US Department of Energy, Office of Energy Efficiency and Renewable Energy [DE-AC0205CH11231]
- National Defense Science and Engineering Graduate (NDSEG) Fellowship Program - Army Research Office (ARO)
We report the development of an electrochemical reactor that can convert 3.0 M KHCO3 into methane, achieving a methane yield of 34%, compared to the previously reported highest yield of 3%. The reactor utilizes a reactive carbon solution and a cationic surfactant in the catholyte to suppress hydrogen evolution and increase methane formation. Furthermore, a 1D continuum model confirms the significant role of H+ transported by a bipolar membrane in promoting methane formation over multicarbon products. These findings provide important design principles for electrochemical methane synthesis.
We report an electrochemical reactor that converts 3.0 M KHCO3into methane at the cathode, and oxidizes water at the anode. The molar ratio ofmethane product to unreacted CO2gas (defined herein asmethane yield) wasmeasured to be 34% at a partial current density of 120 mA cm-2. The highestpreviously reported CO2-to-methane yield is 3%. Our reactor achieved thisimprovement in methane yield because it is fed with 3.0 M KHCO3, a type ofreactive carbon solution, rather than gaseous CO2. The reactor uses H+deliveredby a bipolar membrane to form CO2at the cathode. This CO2is subsequentlyreduced into methane. A cationic surfactant added to the catholyte suppressed hydrogen evolution and increased methaneformation. A 1D continuum model confirmed that H+from the membrane promotes the formation of methane overmulticarbon products at the cathode. Thesefindings present design principles for electrochemical methane synthesis.
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