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Title: Proton Conductivity in Phosphoric Acid: The Role of Quantum Effects

Abstract

Phosphoric acid has one of the highest intrinsic proton conductivities of any known liquids, and the mechanism of this exceptional conductivity remains a puzzle. In our detailed experimental studies we discovered a strong isotope effect in the conductivity of phosphoric acids caused by (i) a strong isotope shift of the glass transition temperature and (ii) a significant reduction of the energy barrier by zero-point quantum fluctuations. Our results suggest that the high conductivity in phosphoric acids is caused by a very efficient proton transfer mechanism, which is strongly assisted by quantum effects.

Authors:
 [1];  [2];  [3];  [4];  [4];  [5]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemical and Biomolecular Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
  3. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering
  4. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
  5. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1347334
Grant/Contract Number:  
AC05-00OR22725; CHE-1213444
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 15; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Heres, M., Wang, Y., Griffin, P. J., Gainaru, C., Sokolov, A. P., and Oak Ridge National Lab. Proton Conductivity in Phosphoric Acid: The Role of Quantum Effects. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.117.156001.
Heres, M., Wang, Y., Griffin, P. J., Gainaru, C., Sokolov, A. P., & Oak Ridge National Lab. Proton Conductivity in Phosphoric Acid: The Role of Quantum Effects. United States. doi:10.1103/PhysRevLett.117.156001.
Heres, M., Wang, Y., Griffin, P. J., Gainaru, C., Sokolov, A. P., and Oak Ridge National Lab. Fri . "Proton Conductivity in Phosphoric Acid: The Role of Quantum Effects". United States. doi:10.1103/PhysRevLett.117.156001. https://www.osti.gov/servlets/purl/1347334.
@article{osti_1347334,
title = {Proton Conductivity in Phosphoric Acid: The Role of Quantum Effects},
author = {Heres, M. and Wang, Y. and Griffin, P. J. and Gainaru, C. and Sokolov, A. P. and Oak Ridge National Lab.},
abstractNote = {Phosphoric acid has one of the highest intrinsic proton conductivities of any known liquids, and the mechanism of this exceptional conductivity remains a puzzle. In our detailed experimental studies we discovered a strong isotope effect in the conductivity of phosphoric acids caused by (i) a strong isotope shift of the glass transition temperature and (ii) a significant reduction of the energy barrier by zero-point quantum fluctuations. Our results suggest that the high conductivity in phosphoric acids is caused by a very efficient proton transfer mechanism, which is strongly assisted by quantum effects.},
doi = {10.1103/PhysRevLett.117.156001},
journal = {Physical Review Letters},
number = 15,
volume = 117,
place = {United States},
year = {Fri Oct 07 00:00:00 EDT 2016},
month = {Fri Oct 07 00:00:00 EDT 2016}
}

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Cited by: 2 works
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Works referenced in this record:

On the development of proton conducting polymer membranes for hydrogen and methanol fuel cells
journal, April 2001