Thermodynamically driven self-formation of copper-embedded nitrogen-doped carbon nanofiber catalysts for a cascade electroreduction of carbon dioxide to ethylene
| Autor: | Sang‐Ho Oh, Jihun Oh, Young-Chang Joo, Deokgi Hong, Wonhyo Joo, Ji-Yong Kim, Jae-Chan Lee, Gun-Do Lee, Beomil Kim, Miyoung Kim |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Carbon nanofiber chemistry.chemical_element 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Copper 0104 chemical sciences Catalysis law.invention Chemical engineering chemistry law Nanofiber General Materials Science Calcination 0210 nano-technology Faraday efficiency |
| Zdroj: | Journal of Materials Chemistry A. 8:11632-11641 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d0ta03322g |
| Popis: | Electrocatalysts for CO2 electroreduction require not only high-performance active materials to control the series reaction but also conductive and durable supports to ensure long-term stability under harsh operating conditions. Instead of conventional heterogeneous catalysts made by attaching metal on supports, we manufactured a self-formed tandem catalyst designed for a cascade electroreduction of CO2 to C2H4. Using oxygen partial pressure-controlled calcination, electrospun copper acetate/polyacrylonitrile nanofibers were successfully transformed into porous carbon nanofibers consisting of doped N and metallic Cu particles. Doped nitrogen atoms adjacent to Cu atoms trigger the reaction by increasing the amount of CO* on the Cu surfaces, which lowers the energy required for CO dimerization that is used for C2H4 production. The Cu-embedded N-doped carbon nanofibers exhibit a C2H4 faradaic efficiency of 62% at a potential of −0.57 V vs. RHE with high current density of 600 mA cm−2 and excellent long-term stability. DFT calculations suggest that the lowered overpotential originates from the decreased CO dimerization energy barrier due to the doped N triggering CO production around the Cu particles. |
| Databáze: | OpenAIRE |
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