Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 45, Pages 16172-16176Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201909257
Keywords
carbon-monoxide reduction; cobalt phthalocyanine; electrochemistry; methanol; molecular catalyst
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Funding
- French National Agency for Research [ANR-16-CE05-0010-01]
- China Scholarship Council [201606220034]
- Institut Universitaire de France (IUF)
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Conversion of CO2 into valuable molecules is a field of intensive investigation with the aim of developing scalable technologies for making fuels using renewable energy sources. While electrochemical reduction into CO and formate are approaching industrial maturity, a current challenge is obtaining more reduced products like methanol. However, literature on the matter is scarce, and even more for the use of molecular catalysts. Here, we demonstrate that cobalt phthalocyanine, a well-known catalyst for the electrochemical conversion of CO2 to CO, can also catalyze the reaction from CO2 or CO to methanol in aqueous electrolytes at ambient conditions of temperature and pressure. The studies identify formaldehyde as a key intermediate and an unexpected pH effect on selectivity. This paves the way for establishing a sequential process where CO2 is first converted to CO which is subsequently used as a reactant to produce methanol. Under ideal conditions, the reaction shows a global Faradaic efficiency of 19.5% and chemical selectivity of 7.5%.
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