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Understanding Vanadium Ion Diffusion in Nafion Using an Atomistic Study and Microscopic Concentration Profiles.

Sven Hampel1,2, Christian Lutz1, Gerald Falkenberg2

  • 1Institute of Inorganic and Analytical Chemistry, Clausthal University of Technology, Arnold-Sommerfeld-Straße 4, 38678 Clausthal-Zellerfeld, Germany.

Membranes
|June 25, 2026
PubMed
Summary
This summary is machine-generated.

Investigating vanadium ion (V3+) transport in Nafion membranes reveals a significant decrease in diffusivity at larger scales. This study combines micro X-ray fluorescence and molecular dynamics to understand ion transport mechanisms in ion-exchange membranes.

Keywords:
XRFionomeric membranemolecular dynamicsunsteady diffusion

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Physical Chemistry

Background:

  • Ionomeric membrane functionality hinges on aqueous network formation, crucial for ion transport.
  • The diffusion of highly charged ions like V3+ in membranes such as Nafion remains poorly understood.
  • Understanding V3+ transport is vital for applications involving ion-exchange membranes.

Purpose of the Study:

  • To investigate the diffusion of V3+ ions in Nafion membranes.
  • To elucidate the relationship between local molecular interactions and macroscopic ion transport.
  • To explore the influence of hydration levels on V3+ diffusion dynamics.

Main Methods:

  • Micro X-ray fluorescence (μXRF) was used to obtain V3+ concentration profiles over a 180 μm scan with a 0.5 μm spot.
  • Molecular dynamics (MD) simulations were employed to study local V3+ interactions and diffusion at the molecular level (approx. 30 nm scale).
  • Concentration profiles were analyzed using error function formalism, and diffusion coefficients were calculated from mean-square displacement.

Main Results:

  • Microscopic V3+ diffusion coefficient in Nafion at λH2O/SO3=12 was determined to be 4×10⁻¹³ m²/s.
  • MD simulations revealed that V3+ ions can order water molecules at low hydration levels (λH2O/SO3=6).
  • A molecular-level diffusion coefficient of 2.5×10⁻¹⁰ m²/s for V3+ was obtained from MD simulations at λH2O/SO3=6, indicating a decrease in diffusivity over longer length scales.

Conclusions:

  • The study confirms a significant decrease in V3+ diffusivity in Nafion membranes over longer length scales, consistent with phenomena observed for water and H+.
  • The findings highlight the interplay between local molecular interactions, water pocket connectivity, and macroscopic ion transport.
  • The experimental and simulation approach is adaptable for studying ion transport in various ion-exchange membrane systems and conditions.