Journal
RSC ADVANCES
Volume 10, Issue 70, Pages 43075-43084Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra08857a
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Funding
- National Science Foundation of China [21873078, 21673185, 21933009]
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CO2 electroreduction reaction (CO2ER) by single metal sites embedded in N-doped graphene (M@N-Gr, M = Cu and Fe) and carbon nanotubes (M@N-CNT, M = Cu and Fe) has been explored by extensive first-principles calculations in combination with the computational hydrogen electrode model. Both atomically dispersed Cu and Fe nanostructures, as the single atom catalysts (SACs), have higher selectivity towards CO2ER, compared to hydrogen evolution reduction (HER), and they can catalyze CO2ER to CO, HCOOH, and CH3OH. In comparison with Cu@N-Gr, the limiting potentials for generating CO, HCOOH, and CH3OH are reduced obviously on the high-curvature Cu@N-CNT. However, the curvature effect is less notable for the single-Fe-atom catalysts. Such discrepancies can be attributed to the d-band center changes of the single Cu and Fe sites and their different dependences on the curvature of carbon-based support materials.
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