4.8 Article

Hydrogen production by water electrolysis using tetra-alkyl-ammonium-sulfonic acid ionic liquid electrolytes

Journal

JOURNAL OF POWER SOURCES
Volume 243, Issue -, Pages 822-825

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.06.077

Keywords

Ionic liquid; Hydrogen production; Water electrolysis; TEA-PS center dot BF4

Funding

  1. INCT-Catalise-CNPq
  2. CNPq/FAPERGS/PRONEX
  3. CEEE

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Triethylammonium-propanesulfonic acid tetrafluoroborate (TEA-PS center dot BF4) is used as an electrolyte in the water electrolysis. The electrolysis of water with this ionic conductor produces high current densities with high efficiencies, even at room temperatures. A system using TEA-PS center dot BF4 in an electrochemical cell with platinum electrodes has current densities (i) up to 1.77 A cm(-2) and efficiencies between 93 and 99% in temperatures ranging from 25 degrees C to 80 degrees C. The activation energy observed with TEA-PS center dot BF4 is ca. 9.3 kJ mol(-1), a low value that can be explained by the facilitation of proton transport in the organised aqueous ionic liquid media. The unexpectedly high efficiency of this system is discussed by taking into account the high conductivities associated with the Bronsted and Lewis acidity characteristics associated with these ionic conductive materials. (c) 2013 The Authors. Published by Elsevier B.V. All rights reserved.

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