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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Adaptive motifs enhance functionality in systems like enzymes and synthetic catalysts.
  • Metal-organic frameworks (MOFs) can undergo structural changes in response to external stimuli.
  • Understanding the in situ responsive behavior of MOFs is crucial for designing functional systems.

Purpose of the Study:

  • To investigate the dynamic behavior of an electrocatalytic manganese-porphyrin-containing MOF (Mn-MOF) system.
  • To explore the potential of Mn-MOFs in electrochemical CO2 fixation.
  • To develop a methodology for studying MOF dynamics and catalytic cycles.

Main Methods:

  • Utilized a combination of electrochemistry and in situ spectroscopic probes (UV-vis absorption, resonance Raman, infrared).
  • Employed density functional theory (DFT) calculations alongside experimental data.
  • Investigated the structural modulations of the Mn-MOF under applied voltage.

Main Results:

  • Discovered a reversible cleavage of porphyrin carboxylate ligands in the Mn-MOF under applied voltage, indicating structural restructuration.
  • Demonstrated the Mn-MOF's capacity for electrochemical CO2 fixation.
  • Successfully captured reaction intermediates within the catalytic cycle using spectroscopy.

Conclusions:

  • The Mn-MOF exhibits dynamic, enzyme-inspired electrocatalytic behavior.
  • The developed methodology enables in situ investigation of MOF dynamics and catalytic processes.
  • This work opens avenues for applying dynamic MOFs in electrocatalysis and CO2 utilization.