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This study reveals how formaldehyde adsorbs and converts on ZIF-8 crystal surfaces. In situ Photo-induced Force Microscopy (PiFM) and Density Functional Theory (DFT) show external surface termination dictates these processes, not defects.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Catalysis

Background:

  • Catalytic processes rely on gas molecule interactions with functional materials.
  • Gaseous molecule sorption and conversion often occur at specific surface sites.

Purpose of the Study:

  • To investigate site-specific formaldehyde sorption and conversion on ZIF-8 microcrystals.
  • To understand the role of external surface termination and defects in these processes.
  • To demonstrate the utility of in situ Photo-induced Force Microscopy (PiFM) for studying porous materials.

Main Methods:

  • In situ Photo-induced Force Microscopy (PiFM) for nanoscale imaging.
  • Density Functional Theory (DFT) calculations for theoretical analysis.
  • Study of well-defined faceted ZIF-8 microcrystals.

Main Results:

  • Formaldehyde preferentially adsorbs on high-index planes of ZIF-8.
  • In situ PiFM visualized unsaturated nanodomains with enhanced sorption.
  • Structure-sensitive formaldehyde conversion via methoxy and formate pathways was observed on defective ZIF-8.
  • External surface termination, not defect concentration, primarily influenced sorption and conversion.

Conclusions:

  • Specific atomic arrangements on high-index surfaces drive formaldehyde interactions.
  • In situ PiFM is a powerful tool for structure sensitivity studies in porous materials.
  • Surface termination plays a critical role in catalytic events on ZIF-8.