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Designing Aqueous Organic Electrolytes for Zinc–Air Batteries: Method, Simulation, and Validation

Clark, Simon; Mainar, Aroa Ramos; Iruin, Elena; Colmenares, Luis César; Blázquez, Jose Alberto; Tolchard, Julian Richard; Jusys, Zenonas; Horstmann, Birger

Abstract:
Aqueous zinc–air batteries (ZABs) are a low‐cost, safe, and sustainable technology for stationary energy storage. ZABs with pH‐buffered near‐neutral electrolytes have the potential for longer lifetime compared to traditional alkaline ZABs due to the slower absorption of carbonates at nonalkaline pH values. However, existing near‐neutral electrolytes often contain halide salts, which are corrosive and threaten the precipitation of ZnO as the dominant discharge product. This paper presents a method for designing halide‐free aqueous ZAB electrolytes using thermodynamic descriptors to computationally screen components. The dynamic performance of a ZAB with one possible halide‐free aqueous electrolyte based on organic salts is simulated using an advanced method of continuum modeling, and the results are validated by experiments. X‐ray diffraction, scanning electron microscopy, and energy dispersive X‐ray spectroscopy measurements of Zn electrodes show that ZnO is the dominant discharge product, and operando pH measurements confirm the stability of the electrolyte pH during cell cycling. Long‐term full cell cycling tests are performed, and rotating ring disk electrode measurements elucidate the mechanism of oxygen reduction reaction and oxygen evolution reaction. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000105839
Veröffentlicht am 10.03.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1614-6832, 1614-6840
KITopen-ID: 1000105839
Erschienen in Advanced energy materials
Band 10
Heft 10
Seiten Article: 1903470
Vorab online veröffentlicht am 30.01.2020
Nachgewiesen in Scopus
Web of Science
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