Bioinspired molecule-functionalized Cu with high CO adsorption for efficient CO electroreduction to acetate

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 53; no. 26; pp. 1919 - 1927
• Main Authors: Lu, Xuanzhao, Yuan, Baozhen, Liu, Yi, Liu, Li-Xia, Zhu, Jun-Jie
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 02.07.2024
• Subjects: Adsorption; Aqueous solutions; Carbon dioxide; Carbon monoxide; Catalysts; Chemical reduction; Cobalt; Electrocatalysts; Electrolysis; Electrolytes; Electrowinning; Raman spectroscopy
• ISSN: 1477-9226; 1477-9234; 1477-9234
• DOI: 10.1039/d4dt01293c

Electrochemical reduction of carbon dioxide (CO 2 ) or carbon monoxide (CO) to valuable multi-carbon (C 2+ ) products like acetate is a promising approach for a sustainable energy economy. However, it is still challenging to achieve high activity and selectivity for acetate production, especially in neutral electrolytes. Herein, a bioinspired hemin/Cu hybrid catalyst was developed to enhance the surface *CO coverage for highly efficient electroreduction of CO to acetate fuels. The hemin/Cu electrocatalyst exhibits a remarkable faradaic efficiency of 45.2% for CO-to-acetate electroreduction and a high acetate partial current density of 152.3 mA cm −2 . Furthermore, the developed hybrid catalyst can operate stably at 200 mA cm −2 for 14.6 hours, producing concentrated acetate aqueous solutions (0.235 M, 2.1 wt%). The results of in situ Raman spectroscopy and theoretical calculations proved that the Fe-N 4 structure of hemin could enhance the CO adsorption and enrich the local concentration of CO, thereby improving C-C coupling for acetate production. In addition, compared to the unmodified Cu catalysts, the Cu catalysts functionalized with cobalt phthalocyanine with a Co-N 4 structure also exhibit improved acetate performance, proving the universality of this bioinspired molecule-enhanced strategy. This work paves a new way to designing bioinspired electrolysis systems for producing specific C 2+ products from CO 2 or CO electroreduction. Bioinspired molecule-functionalized Cu for efficient CO-to-acetate electroreduction via enhanced CO adsorption.