Citation: Maomao Liu, Guizeng Liang, Ningce Zhang, Tao Li, Lipeng Diao, Ping Lu, Xiaoliang Zhao, Daohao Li, Dongjiang Yang. Electron-rich Ni2+ in Ni3S2 boosting electrocatalytic CO2 reduction to formate and syngas[J]. Chinese Journal of Structural Chemistry, ;2024, 43(8): 100359. doi: 10.1016/j.cjsc.2024.100359 shu

Electron-rich Ni2+ in Ni3S2 boosting electrocatalytic CO2 reduction to formate and syngas

Rationally constructed new catalyst can promote carbon dioxide reduction reaction (CO2RR) to valuable carbonaceous fuels such as formate and CO, providing a promising strategy for low CO2 emissions. Herein, the synthesized Ni3S2@C as a highly efficient electro-catalyst exhibits remarkable selectivity for formate with 73.9% faradaic efficiency (FE) at -0.7 V vs. RHE. At high applied potential, it shows a high syngas evolution with CO/H2 ratios (0.54 ∼ 3.15) that are suitable for typical downstream thermochemical reactions. The experimental and theoretical analyses demonstrate that the electron-rich Ni2+ in Ni3S2 enhances the adsorption behavior of the *OCHO intermediate, reduces the energy barrier of the formation of intermediates, and improves the selectivity of the formate product. Attenuated total reflection surface-enhanced infrared absorption spectra conducted in situ show that *OCHO intermediate is more likely to be generated and adsorbed on Ni3S2, enhancing the selectivity and activity of the formate product.
- Carbon dioxide reduction,
- Electron-rich Ni2+,
- High selectivity,
- Formate,
- *OCHO intermediate
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