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Open AccessArticle

Simple and Precise Approach for Determination of Ohmic Contribution of Diaphragms in Alkaline Water Electrolysis

1
Centro Nacional del Hidrógeno (CNH2). Prolongación Fernando El Santo s/n, 13500 Puertollano, Ciudad Real, Spain
2
Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Università degli studi di Cagliari, Via Marengo 2, 09123 Cagliari, Italy
*
Author to whom correspondence should be addressed.
Membranes 2019, 9(10), 129; https://doi.org/10.3390/membranes9100129
Received: 31 August 2019 / Revised: 26 September 2019 / Accepted: 2 October 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Membranes for Electrolysis, Fuel Cells and Batteries)
A simple and low-cost alternating current (AC)-based method, without electrolyte correction, is proposed (Electrochemical Impedance Spectroscopy (EIS)-Zero Gap Cell) for the determination of ohmic contribution of diaphragms. The effectiveness of the proposed methodology was evaluated by using a commercial Alkaline Water Electrolysis (AWE) diaphragm (Zirfon®). Furthermore, the results were compared with two conventional electrochemical methodologies for calculating the separator resistance, based on direct current (DC), and AC measurements, respectively. Compared with the previous techniques, the proposed approach reported more accurate and precise values of resistance for new and aged samples. Compared with the manufacturer reference, the obtained error values for new samples were 0.33%, 5.64%, and 41.7%, respectively for EIS-Zero gap cell, AC and DC methods, confirming the validity and convenience of the proposed technique. View Full-Text
Keywords: alkaline water electrolysis; diaphragm; ionic conductivity; ohmic contribution alkaline water electrolysis; diaphragm; ionic conductivity; ohmic contribution
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MDPI and ACS Style

Rodríguez, J.; Palmas, S.; Sánchez-Molina, M.; Amores, E.; Mais, L.; Campana, R. Simple and Precise Approach for Determination of Ohmic Contribution of Diaphragms in Alkaline Water Electrolysis. Membranes 2019, 9, 129.

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