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Ultrafast proton transport occurs via a collective mechanism at sulfonic acid surfaces. This discovery aids in designing advanced proton conducting materials for fuel cells.

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Area of Science:

  • Surface science
  • Materials science
  • Electrochemistry

Background:

  • Surface proton conduction is crucial for various scientific fields.
  • Experimental evidence for ultrafast proton transport at anionic surfaces remains debated.

Purpose of the Study:

  • To investigate proton dynamics at sulfonic-acid terminated surfaces.
  • To elucidate the mechanism behind ultrafast proton transport.

Main Methods:

  • Ab initio molecular dynamics simulations were employed.
  • Proton dynamics at sulfonic-acid terminated surfaces were studied.

Main Results:

  • A highly efficient collective mechanism for hydronium ion translocation was identified at a critical surface group separation of ~6.5 Å.
  • Orientational fluctuations of sulfonate groups initiate proton motion through hydrogen bond breaking.
  • The activation free energy for this process was determined to be 0.3 eV (±0.1 eV).
  • The mechanism exhibits soliton-like characteristics due to sulfonate anion symmetry and strong hydrogen bonding.

Conclusions:

  • The findings explain ultrafast proton transport at sulfonic acid surfaces.
  • This research will advance surface conductance studies and the design of high-performance proton conducting polymers for fuel cells operating above 100 °C.