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Synergistic catalysis between atomically dispersed Fe and a pyrrolic-N-C framework for CO2 electroreduction

Authors
  • Xu, Chaochen
  • Vasileff, Anthony
  • Wang, Dan
  • Jin, Bo
  • Zheng, Yao
  • Qiao, Shi-Zhang
Publication Date
Nov 01, 2019
Source
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
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Abstract

Atomically dispersed Fe immobilized within N-doped carbon nanosheets (Fe-SA) is successfully synthesized. The optimal Fe-SA catalyst achieves a high faradaic efficiency of ca. 90% for CO2 electroreduction toward CO at a low overpotential of 0.47 V. A series of controlled tests show that there is a synergistic effect between the Fe centers and the pyrrolic-N-C framework which facilitates catalytic activity. Specifically, pyrrolic-N-C sites with high local electron density increase the initial CO2 adsorption while positively charged Fe enhances the water dissociation to provide a proton source for further CO2 reduction.

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