Selectively converting CO2 to HCOOH on Cu-alloys integrated in hematite-driven artificial photosynthetic cells
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KAUST DepartmentPhysical Science and Engineering (PSE) Division
Mechanical Engineering Program
Clean Combustion Research Center
KAUST Grant NumberBAS/1/1413-01-01
Embargo End Date2025-02-16
Permanent link to this recordhttp://hdl.handle.net/10754/689486
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AbstractThe integration of electrochemical CO2 reduction (CO2RR) and photoelectrochemical water oxidation offers a sustainable access to valuable chemicals and fuels. Here, we develop a rapidly annealed hematite photoanode with a photocurrent density of 2.83 mA cm−2 at 1.7 VRHE to drive the full-reaction. We also present Cu-alloys electrocatalysis extended from CuInSnS4, which are superior in both activity and selectivity for CO2RR. Specifically, the screened CuInSn achieves a CO2 to HCOOH Faradaic efficiency of 93% at a cell voltage of −2.0 V by assembling into artificial photosynthesis cell. The stability test of IT exhibits less than 3% degradation over 24 h. Furthermore, in-situ Raman spectroscopy reveals that both CO32- and CO2 are involved in CO2RR as reactants. The preferential affinity of C for H in the *HCO2 intermediate enables an improved HCOOH-selectivity, highlighting the role of multifunctional Cu in reducing the cell voltage and enhancing the photocurrent density.
CitationZhao, J., Huang, L., Xue, L., Niu, Z., Zhang, Z., Ding, Z., Yuan, R., Lu, X., & Long, J. (2023). Selectively converting CO2 to HCOOH on Cu-alloys integrated in hematite-driven artificial photosynthetic cells. Journal of Energy Chemistry, 79, 601–610. https://doi.org/10.1016/j.jechem.2022.12.062
SponsorsThis work was financially supported by the National Key R&D Program of China (2018YFE0208500) and the National Natural Science Foundation of China (Grants No. 22072022). X. L. was funded by King Abdullah University of Science and Technology (KAUST) through the baseline funding (BAS/1/1413-01-01).
JournalJournal of Energy Chemistry