1. Br-doped Cu nanoparticle formed by in situ restructuring for highly efficient electrochemical reduction of CO2 to formate.
- Author
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Wang, Xiaoxiao, Guo, Awei, Wang, Yunlong, Chen, Zhipeng, Guo, Yuxuan, Xie, Haijiao, Shan, Weilong, and Zhang, Junjie
- Subjects
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ELECTROLYTIC reduction , *COPPER , *GREENHOUSE gases , *NANOPARTICLES , *ELECTRONIC modulation , *CARBON dioxide - Abstract
[Display omitted] Electrochemical conversion of CO 2 into chemical feedstock, such as an energy-dense liquid product (formate), is desirable to address the excessive emission of greenhouse gases and store energy. Cu-based catalysts exhibit great advantages in electrochemical CO 2 reduction reaction (eCO 2 RR) due to their low cost and high abundance, but suffer from low selectivity of formate. In this work, a facile one-pot approach is developed to synthesize CuBr nanoparticle (CuBr NP) that can conduct in situ dynamic restructuring during eCO 2 RR to generate Br-doped Cu NP. The in situ-formed Br-doped Cu NP can afford up to 91.6% Faradaic efficiency (FE) for formate production with a partial current density of 15.1 mA·cm−2 at −0.94 V vs. reversible hydrogen electrode (RHE) in an H-type cell. Moreover, Br-doped Cu NP can deliver excellent long-term stability for up to 25 h. The first-principles density functional theory (DFT) calculations show that the doped Br can regulate the electronic structure of Cu active sites to optimize the adsorption of the HCOO* intermediate, greatly hindering the formation of CO and H 2. This work provides a strategy for electronic modulation of metal active site and suggests new opportunities in high selectivity for electrocatalytic reduction of CO 2 to formate over Cu-based catalysts. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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