Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 1, Pages 345-351Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c03957
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- Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia [425]
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This study reveals the catalytic performance of polycrystalline copper, Cu2O-derived copper, and CuO-derived copper in the electroreduction of CO2. The results show that all three catalysts exhibit high electroreduction efficiency and production rate in a flow electrolyzer. The selectivity and activity of ethylene-dominated C2+ products are similar on the three catalysts at the same current density.
Electroreduction of carbon dioxide (CO2) in a flow electrolyzer represents a promising carbon-neutral technology with efficient production of valuable chemicals. In this work, the catalytic performance of polycrystalline copper (Cu), Cu2O-derived copper (O(I)D-Cu), and CuO-derived copper (O(II)D-Cu) toward CO2 reduction is unraveled in a custom-designed flow cell. A peak Faradaic efficiency of >70% and a production rate of ca. -250 mA cm(-2) toward C2+ products have been achieved on all the catalysts. In contrast to previous studies that reported a propensity for C2+ products on OD-Cu in conventional H-cells, the selectivity and activity of ethylene-dominated C2+ products are quite similar on the three types of catalysts at the same current density in our flow reactor. Our analysis also reveals current density to be a critical factor determining the C-C coupling in a flow cell, regardless of Cu catalyst's initial oxidation state and morphology.
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