A versatile transition metal ion-binding motif derived from covalent organic framework for efficient CO2 electroreduction
| Autor: | Haijin Zhu, Gordon G. Wallace, Long Hao, Jing Ning, Amruthalakshmi Vijayakumar, Yong Zhao, Caiyun Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Transition metal ion binding
Chemistry Process Chemistry and Technology Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Catalysis 0104 chemical sciences Metal Transition metal visual_art visual_art.visual_art_medium 0210 nano-technology Mesoporous material Carbon General Environmental Science Covalent organic framework |
| Zdroj: | Applied Catalysis B: Environmental. 291:119915 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2021.119915 |
| Popis: | We demonstrate a versatile transition metal ion-binding motif for constructing highly efficient metal atom-embedded carbon catalysts for electrochemical CO production. It is a mesoporous N-doped carbon (N-C) derived from a covalent organic framework via molten-salt assisted carbonization. Three different transition metals (Co, Fe or Ni) have been immobilized into the N-rich mesopores via ion coordination, forming catalysts with isolated and coordinately unsaturated metal-N moieties. These catalysts all exhibit excellent electrocatalytic activities for CO2-to-CO conversion with a high faradaic efficiency > 80 % and a high current density > 10 mA cm−2 at modest overpotentials around 500 mV. Using Ni- or Fe-N-C, a highly selective (> 95 %) CO generation was observed. By performing the structure-property analysis with three other N-C materials as control, such high performance is ascribed to the efficient metal-N catalytic sites generated by the cooperative immobilization of metal atoms with pyridinic-N and pyrrolic-N species in the mesoporous carbon matrix. |
| Databáze: | OpenAIRE |
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