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A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes

Flexible and scalable energy storage solutions are necessary for mitigating fluctuations of renewable energy sources. The main advantage of redox flow batteries is their ability to decouple power and energy. However, they present some limitations including poor performance, short‐lifetimes, and expe...

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Detalles Bibliográficos
Autores principales: Navalpotro, Paula, Palma, Jesus, Anderson, Marc, Marcilla, Rebeca
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5655901/
https://www.ncbi.nlm.nih.gov/pubmed/28658538
http://dx.doi.org/10.1002/anie.201704318
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author Navalpotro, Paula
Palma, Jesus
Anderson, Marc
Marcilla, Rebeca
author_facet Navalpotro, Paula
Palma, Jesus
Anderson, Marc
Marcilla, Rebeca
author_sort Navalpotro, Paula
collection PubMed
description Flexible and scalable energy storage solutions are necessary for mitigating fluctuations of renewable energy sources. The main advantage of redox flow batteries is their ability to decouple power and energy. However, they present some limitations including poor performance, short‐lifetimes, and expensive ion‐selective membranes as well as high price, toxicity, and scarcity of vanadium compounds. We report a membrane‐free battery that relies on the immiscibility of redox electrolytes and where vanadium is replaced by organic molecules. We show that the biphasic system formed by one acidic solution and one ionic liquid, both containing quinoyl species, behaves as a reversible battery without any membrane. This proof‐of‐concept of a membrane‐free battery has an open circuit voltage of 1.4 V with a high theoretical energy density of 22.5 Wh L(−1), and is able to deliver 90 % of its theoretical capacity while showing excellent long‐term performance (coulombic efficiency of 100 % and energy efficiency of 70 %).
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spelling pubmed-56559012017-11-01 A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes Navalpotro, Paula Palma, Jesus Anderson, Marc Marcilla, Rebeca Angew Chem Int Ed Engl Communications Flexible and scalable energy storage solutions are necessary for mitigating fluctuations of renewable energy sources. The main advantage of redox flow batteries is their ability to decouple power and energy. However, they present some limitations including poor performance, short‐lifetimes, and expensive ion‐selective membranes as well as high price, toxicity, and scarcity of vanadium compounds. We report a membrane‐free battery that relies on the immiscibility of redox electrolytes and where vanadium is replaced by organic molecules. We show that the biphasic system formed by one acidic solution and one ionic liquid, both containing quinoyl species, behaves as a reversible battery without any membrane. This proof‐of‐concept of a membrane‐free battery has an open circuit voltage of 1.4 V with a high theoretical energy density of 22.5 Wh L(−1), and is able to deliver 90 % of its theoretical capacity while showing excellent long‐term performance (coulombic efficiency of 100 % and energy efficiency of 70 %). John Wiley and Sons Inc. 2017-07-19 2017-10-02 /pmc/articles/PMC5655901/ /pubmed/28658538 http://dx.doi.org/10.1002/anie.201704318 Text en © 2017 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial (http://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Communications
Navalpotro, Paula
Palma, Jesus
Anderson, Marc
Marcilla, Rebeca
A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes
title A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes
title_full A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes
title_fullStr A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes
title_full_unstemmed A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes
title_short A Membrane‐Free Redox Flow Battery with Two Immiscible Redox Electrolytes
title_sort membrane‐free redox flow battery with two immiscible redox electrolytes
topic Communications
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5655901/
https://www.ncbi.nlm.nih.gov/pubmed/28658538
http://dx.doi.org/10.1002/anie.201704318
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