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Precise Electrochemical Sizing of Individual Electro-Inactive Particles
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Characterizing heterogeneous dynamics at hydrated electrode surfaces.

Adam P Willard1, David T Limmer, Paul A Madden

  • 1Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712, USA.

The Journal of Chemical Physics
|May 17, 2013
PubMed
Summary
This summary is machine-generated.

Water dynamics near platinum surfaces exhibit correlated molecular motion, influenced by disordered hydrogen bonds. This dynamic heterogeneity differs between Pt 111 and Pt 100 surfaces and is sensitive to applied voltage.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Computational Chemistry

Background:

  • Molecular motions in hydration layers near metal surfaces are crucial for interfacial processes.
  • Understanding dynamic heterogeneity is key to characterizing complex liquid-solid interfaces.

Purpose of the Study:

  • To quantitatively analyze the dynamic heterogeneity of water molecules in the first hydration layer on Pt 111 and Pt 100 surfaces.
  • To elucidate the role of frustrated hydrogen bonding networks and metal-water interactions in interfacial water dynamics.
  • To investigate the influence of surface structure and applied voltage on dynamic heterogeneity.

Main Methods:

  • Employing quantitative measures of dynamic heterogeneity, including mobility fields and distributions of persistence and exchange times.
  • Utilizing computational models of platinum (Pt) 111 and Pt 100 surfaces in contact with water.
  • Analyzing the impact of geometric frustration in hydrogen bonding networks due to metal-water interactions.

Main Results:

  • Spatially and temporally correlated motions were observed in the first hydration layer.
  • Dynamics are facilitated by transient disorder in frustrated 2D hydrogen bonding networks.
  • Dynamic heterogeneity on Pt 111 differs qualitatively from that on Pt 100 due to surface geometry.
  • The statistics of ad-layer dynamic heterogeneity respond asymmetrically to applied voltage on both surfaces.

Conclusions:

  • Interfacial water dynamics exhibit significant heterogeneity, influenced by surface structure and metal-water bonding.
  • Frustrated hydrogen bonding networks play a critical role in facilitating water motion at the interface.
  • Applied voltage asymmetrically modulates the dynamic heterogeneity of water ad-layers on platinum surfaces.