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Seeing nanoscale electrocatalytic reactions at individual MoS2 particles under an optical microscope: probing sub-mM oxygen reduction reaction

Afsahi, N ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1039/d4fd00132j
  3. Publisher: 2024
  4. Abstract:
  5. MoS2 is a promising electrocatalytic material for replacing noble metals. Nanoelectrochemistry studies, such as using nanoelectrochemical cell confinement, have particularly helped in demonstrating the preferential electrocatalytic activity of MoS2 edges. These findings have been accompanied by considerable research efforts to synthesize edge-abundant nanomaterials. However, to fully apprehend their electrocatalytic performance, at the single particle level, new instrumental developments are also needed. Here, we feature a highly sensitive refractive index based optical microscopy technique, namely interferometric scattering microscopy (iSCAT), for monitoring local electrochemistry at single MoS2 petal-like sub-microparticles. This work focuses on the oxygen reduction reaction (ORR), which operates at low current densities and thus requires high-sensitivity imaging techniques. By employing a precipitation reaction to reveal the ORR activity and utilizing the high spatial resolution and contrast of iSCAT, we achieve the sensitivity required to evaluate the ORR activity at single MoS2 particles. © 2025 The Royal Society of Chemistry
  6. Keywords:
  7. Image resolution ; Optical microscopy ; Nanomaterial ; Oxygen ; Electrocatalytic materials ; Electrocatalytic reactions ; Interferometric scattering ; MoS 2 ; Nano scale ; Nanoelectrochemistry ; Optical microscopes ; Oxygen reduction reaction ; Reaction activity ; Scattering microscopies ; Current density ; Electrocatalysis ; Electrochemistry ; Light microscopy ; Microscope ; Microscopy ; Pharmaceutics ; Precipitation ; Refraction index ; Refractometry ; Electrolytic reduction
  8. Source: Faraday Discussions ; Volume 257 , 2024 , Pages 107-125 ; 13596640 (ISSN)
  9. URL: https://pubs.rsc.org/en/content/articlelanding/2025/fd/d4fd00132j