Ab initio simulation on the mechanism of proton transport in water

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Ab initio simulations on proton transport in water have been conducted. Using the simulation results together with the experimental data in the literature, currently existing hypotheses, including the one proposed by Agmon [N. Agmon, The Grotthuss mechanism, Chem. Phys. Lett. 244 (5-6) (1995) 456-462], have been examined. Based on the results of the simulations including charge distributions and the movement of the positive charge centers inside the protonated water clusters during the proton diffusion process, one mechanism is found to dominate proton transport in water. The high mobility of protons inside water is mainly due to the high diffusion rate of H5O2+ cations. The diffusion of H5O2+ cations is mainly induced by the thermal movement of water molecules in the second solvation shell of the H5O2+ cations and the Zundel polarization inside the cations. Furthermore, thermal effects play a dominant role during the transport process by affecting the reorientation of water molecules in the neighborhood of the second solvation shell of H5O2+ cations to induce the Zundel polarization and by providing the energy for the cleavage of the hydrogen bond between a water molecule and a newly formed H5O2+ cation. In addition, an external electrical field plays an important role in helping the water molecule reorient and lowering the Zundel polarization energy barrier. Because the weight fraction of H5O2+ cations among the protonated water clusters decreases as the temperature increases, the proposed mechanism is considered to play a dominant role only at temperatures below 672 K.

Original languageEnglish
Pages (from-to)1420-1427
Number of pages8
JournalJournal of Power Sources
Volume161
Issue number2
DOIs
StatePublished - Oct 27 2006

Fingerprint

Protons
Cations
Positive ions
protons
Water
cations
water
simulation
Molecules
Solvation
Polarization
solvation
molecules
polarization
Energy barriers
Charge distribution
Thermal effects
charge distribution
retraining
temperature effects

Keywords

  • Grotthuss mechanism
  • Isomerization
  • Proton transport
  • Zundel polarization

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Ab initio simulation on the mechanism of proton transport in water. / Han, Jiahua; Zhou, Xiangyang; Liu, Hongtan.

In: Journal of Power Sources, Vol. 161, No. 2, 27.10.2006, p. 1420-1427.

Research output: Contribution to journalArticle

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