An Acid-Base Electrochemical Flow Battery as energy storage system

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Title: An Acid-Base Electrochemical Flow Battery as energy storage system
Authors: Sáez, Alfonso | Montiel, Vicente | Aldaz Riera, Antonio
Research Group/s: Electroquímica Aplicada y Electrocatálisis
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Hydrogen | Acid | Base | Energy storage system | Redox flow battery
Knowledge Area: Química Física
Issue Date: 26-Oct-2016
Publisher: Elsevier
Citation: International Journal of Hydrogen Energy. 2016, 41(40): 17801-17806. doi:10.1016/j.ijhydene.2016.08.141
Abstract: In this paper, we present a new Acid-Base Electrochemical Flow Battery (ABEFB). This system is composed of acidic and alkaline solutions, both with a high supporting electrolyte concentration. These solutions are separated by a proton exchange membrane, using hydrogen as both a reactant and a product. Under this configuration, neutralization energy is used as electromotive force. Thus, in the charging process, hydrogen is oxidized to form hydronium ions (hydrogen oxidation reaction –HOR-) (positive electrode) that acidifies positive electrolyte or posilyte, while hydrogen is formed from water (hydrogen evolution reaction –HER-) (negative electrode) that basifies negative electrolyte or negalyte. On the other hand, during the discharging process, both electrolytes are neutralized through hydrogen oxidation and hydrogen evolution reactions. A platinised titanium electrode is chosen for HER and a platinum-catalysed gas diffusion electrode is used for HOR. This proof of concept has been verified for several charge capacities obtaining a maximum power density of 20 mW cm−2 at 49 mA cm−2. In this sense, faradaic efficiency close to 95% and energy efficiency of 55% are also obtained. Finally, the reuse of produced hydrogen is an interesting aspect to be considered.
ISSN: 0360-3199 (Print) | 1879-3487 (Online)
DOI: 10.1016/j.ijhydene.2016.08.141
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd.
Peer Review: si
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Appears in Collections:INV - LEQA - Artículos de Revistas

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