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Reconstructed Bismuth-Based Metal-Organic Framework Nanofibers for Selective CO2 -to-Formate Conversion: Morphology

Yulong Ying1, Bahareh Khezri1, Jiri Kosina2

  • 1Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology Prague, Technická 5, 166 28, Prague 6, Czech Republic.

Chemsuschem
|July 6, 2021
PubMed
Summary

Researchers developed bismuth-based metal-organic frameworks for efficient electrochemical reduction of carbon dioxide (ERCO2) to valuable formic acid. Morphology engineering of CAU-17 nanofibers achieved high selectivity and production rates, advancing sustainable carbon capture technologies.

Keywords:
carbon dioxideelectrocatalysisformic acidmetal−organic frameworksmorphology engineering

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrochemical reduction of carbon dioxide (ERCO2) offers a sustainable route for carbon utilization.
  • Formic acid is a valuable liquid product from ERCO2, but current selectivity is insufficient.
  • Metal-organic frameworks (MOFs) show promise as electrocatalysts for CO2 conversion.

Purpose of the Study:

  • To synthesize bismuth-containing MOF CAU-17 with controlled morphologies (hexagonal prisms and nanofibers) for ERCO2.
  • To investigate H3BTC-mediated morphology reconstruction for creating hierarchical CAU-17 nanofiber structures.
  • To evaluate the electrocatalytic performance of engineered CAU-17 for selective CO2-to-formate conversion.

Main Methods:

  • Wet-chemical synthesis of CAU-17 at room temperature.
  • Morphology engineering via H3BTC-mediated reconstruction.
  • Electrochemical testing of CAU-17-fiber electrodes for CO2 reduction.

Main Results:

  • CAU-17-fiber electrodes synthesized via morphology engineering exhibited superior performance.
  • Achieved high formate Faradaic efficiency (FEHCOO-) of 96.4% and current density (jCOOH-) of 20.4 mA cm-2 at -0.9 V RHE.
  • Demonstrated the effectiveness of morphology control in enhancing MOF electrocatalyst activity for ERCO2.

Conclusions:

  • A mild and effective approach for CAU-17 synthesis and morphology engineering was developed.
  • Morphology engineering of MOFs is crucial for optimizing surface area and catalytic activity in ERCO2.
  • Engineered CAU-17 nanofibers represent a promising catalyst for selective and efficient formic acid production from CO2.