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Nanometer-Resolved Operando Photo-Response of Faceted BiVO4 Semiconductor Nanoparticles.

Shaoqiang Su1, Igor Siretanu1, Dirk van den Ende1

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This summary is machine-generated.

Semiconducting nanoparticles like bismuth vanadate show varying surface potentials and photoresponses across different facets, influenced by pH and surface defects. Understanding these microscopic details is key for optimizing photocatalyst performance in renewable energy applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Semiconducting nanoparticles (NPs) are promising for converting renewable electricity into chemical fuels via photo(electro)catalysis.
  • Current understanding of NP performance is limited by the lack of high-resolution operando characterization techniques.
  • Bismuth vanadate (BiVO4) is a key material in photocatalysis, but its surface behavior at the nanoscale is not fully understood.

Purpose of the Study:

  • To investigate the local surface potentials and photoresponse of bismuth vanadate (BiVO4) nanoparticles at different pH levels.
  • To characterize the role of surface defects and their impact on the photocatalytic behavior of BiVO4 NPs.
  • To provide insights for optimizing photocatalyst design and performance.

Main Methods:

  • Operando characterization techniques with high lateral resolution.
  • Measurement of local surface potentials on BiVO4 nanoparticle facets.
  • Analysis of surface defect structures and their charge distribution.
  • pH-dependent studies of nanoparticle surface properties.

Main Results:

  • Local surface potentials and photoresponses of BiVO4 NPs differ significantly between adjacent facets ({010} and {110}).
  • Isoelectric points of the {010} and {110} facets differ by 1.5 pH units.
  • Illumination induces a strong positive surface photoresponse (+55 mV) on both facets.
  • Surface defects, including vacancies and steps, exhibit localized negative charges and opposite photoresponses.

Conclusions:

  • Facet-dependent surface properties and pH sensitivity are critical for BiVO4 photocatalysis.
  • Surface defects play a crucial role in modulating the electronic properties and photoresponse.
  • Optimizing photocatalyst NPs requires detailed understanding of surface defect distribution and electrolyte interactions.