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Selective Etching Quaternary MAX Phase toward Single Atom Copper Immobilized MXene (Ti3C2Clx) for Efficient CO2 Electroreduction to Methanol
Abstract
Single atom catalysts possess attractive electrocatalytic activities for various chemical reactions owing to their favorable geometric and electronic structures compared to the bulk counterparts. Herein, we demonstrate an efficient approach to producing single atom copper immobilized MXene for electrocatalytic CO 2 reduction to methanol via selective etching of hybrid A layers (Al and Cu) in quaternary MAX phases (Ti 3 (Al 1– x Cu x )C 2 ) due to the different saturated vapor pressures of Al- and Cu-containing products. After selective etching of Al in the hybrid A layers, Cu atoms are well-preserved and simultaneously immobilized onto the resultant MXene with dominant surface functional group (Cl x ) on the outmost Ti layers (denoted as Ti 3 C 2 Cl x ) via Cu–O bonds. Consequently, the as-prepared single atom Cu catalyst exhibits a high Faradaic efficiency value of 59.1% to produce CH 3 OH and shows good electrocatalytic stability. On the basis of synchrotron-based X-ray absorption spectroscopy analysis and density functional theory calculations, the single atom Cu with unsaturated electronic structure (Cu δ+, 0 < δ < 2) delivers a low energy barrier for the rate-determining step (conversion of HCOOH* to absorbed CHO* intermediate), which is responsible for the efficient electrocatalytic CO 2 reduction to CH 3 OH.
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Cited by
Kim, J. Y., Hong, W. T., Phu, T. K. C., Cho, S. C., Kim, B., Baeck, U., Oh, H., Koh, J. H., Yu, X., Choi, C. H., et al. (2024) · Advanced Science · doi:10.1002/advs.202405154 · Cited by 41
Metadata
- Authors
- Zhao, Q., Zhang, C., Hu, R., Du, Z., Gu, J., Cui, Y., Chen, X., Xu, W., Cheng, Z., Li, S., Li, B., Liu, Y., Chen, W., Liu, C., Shang, J., Song, L., & Yang, S.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2021-02-22
- Volume
- 15
- Issue
- 3
- Pages
- 4927-4936
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W3131407445
- Cited by
- 308
- References
- 53
- FWCI
- 8.56
- Type
- journal article
- Language
- en
- Open access
- closed
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