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International Journal of Electrochemistry
Volume 2019, Article ID 5392452, 11 pages
https://doi.org/10.1155/2019/5392452
Research Article

Straight-Parallel Electrodes and Variable Gap for Hydrogen and Oxygen Evolution Reactions

1Departamento de Investigación y Desarrollo en Energías Renovables (DIDER), Instituto de Investigaciones Científicas y Técnicas para la Defensa (CITEDEF) San Juan Bautista de La Salle 4397 (B1603ALO), Villa Martelli, Buenos Aires Province, Argentina
2Escuela Superior Tecnica Grl. Div. Manuel N. Savio, Facultad de Ingenieria del Ejercito, Universidad de la Defensa. Av. Cabildo 15 (C1426AAA), Ciudad Autonoma de Buenos Aires, Argentina

Correspondence should be addressed to María J. Lavorante; moc.liamg@etnarovaljm

Received 30 November 2018; Revised 8 May 2019; Accepted 13 June 2019; Published 1 August 2019

Academic Editor: Gerd-Uwe Flechsig

Copyright © 2019 María J. Lavorante et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The challenges to be overtaken with alkaline water electrolysis are the reduction of energy consumption, the maintenance, and the cost as well as the increase of durability, reliability, and safety. Having these challenges in mind, this work focused on the reduction of the electrical resistance of the electrolyte which directly affects energy consumption. According to the definition of electrical resistance of an object, the reduction of the space between electrodes could lower the electrical resistance but, in this process, the formation of bubbles could modify this affirmation. In this work, the performance analyses of nine different spaces between stainless steel 316L electrodes were carried out, although the spaces proposed are not the same as those from the positive electrode (anode) to the separator and from the separator to the negative electrode (cathode). The reason why this is studied is that stoichiometry of the reaction states that two moles of hydrogen and one mole of oxygen can be obtained per every two moles of water. The proposed spaces were 10.65, 9.20, 8.25, 7.25, 6.30, 6.05, 4.35, 4.15, and 3.40 millimetres. From the nine different analysed distances between electrodes, it can be said that the best performance was reached by one of the smallest distances proposed, 4.15 mm. When the same distance between electrodes was compared (the same and different distance between electrodes and separator), the one that had almost twice the distance (negative compartment) presented an increase in current density of approximately 33% with respect to that where both distances (from electrodes to separator) are the same. That indicates that the stichometry of the electrolysis reaction influenced the performance.