期刊
ADVANCED SCIENCE
卷 10, 期 15, 页码 -出版社
WILEY
DOI: 10.1002/advs.202206933
关键词
2D materials; electrochemical nitrogen fixation; ferric covalent organic frameworks; hydrophobicity; MXenes
2D ferric covalent organic framework/MXene nanosheets with controllable hydrophobic behaviors were prepared via a multiple-in-one synthetic strategy. The boosted hydrophobicity of COF-Fe/MXene effectively inhibits the competitive hydrogen evolution reaction and enhances nitrogen reduction reactions.
Electrocatalytic nitrogen reduction reaction (NRR) represents a promising sustainable approach for NH3 synthesis. However, the poor NRR performance of electrocatalysts is a great challenge at this stage, mainly owing to their low activity and the competitive hydrogen evolution reaction (HER). Herein, 2D ferric covalent organic framework/MXene (COF-Fe/MXene) nanosheets with controllable hydrophobic behaviors are successfully prepared via a multiple-in-one synthetic strategy. The boosting hydrophobicity of COF-Fe/MXene can effectively repel water molecules to inhibit the HER for enhanced NRR performances. By virtue of the ultrathin nanostructure, well-defined single Fe sites, nitrogen enrichment effect, and high hydrophobicity, the 1H,1H,2H,2H-perfluorodecanethiol modified COF-Fe/MXene hybrid shows a NH3 yield of 41.8 mu g h(-1) mg(cat.)(-1) and a Faradaic efficiency of 43.1% at -0.5 V versus RHE in a 0.1 m Na2SO4 water solution, which are vastly superior to the known Fe-based catalysts and even to the noble metal catalysts. This work provides a universal strategy to design and synthesis of non-precious metal electrocatalysts for high-efficiency N-2 reduction to NH3.
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