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ChemSusChem. 2015 Feb;8(3):481-5. doi: 10.1002/cssc.201403143. Epub 2014 Dec 15.

An aqueous zinc-ion battery based on copper hexacyanoferrate.

Author information

1
Semiconductor and Energy Conversion, Zentrum für Elektrochemie - CES, Ruhr-Universität Bochum, Universitätsstr.150, 44780 Bochum (Germany), Fax: (+49) 0234-32-14420 www.ruhr-uni-bochum.de/ces/Fabio.htm. rafael.trocolijimenez@rub.de.

Abstract

A new zinc-ion battery based on copper hexacyanoferrate and zinc foil in a 20 mM solution of zinc sulfate, which is a nontoxic and noncorrosive electrolyte, at pH 6 is reported. The voltage of this novel battery system is as high as 1.73 V. The system shows cyclability, rate capability, and specific energy values near to those of lithium-ion organic batteries based on Li4 Ti5 O12 and LiFePO4 at 10 C. The effects of Zn(2+) intercalation and H2 evolution on the performance of the battery are discussed in detail. In particular, it has been observed that hydrogen evolution can cause a shift in pH near the surface of the zinc electrode, and favor the stabilization of zinc oxide, which decreases the performance of the battery. This mechanism is hindered when the surface of zinc becomes rougher.

KEYWORDS:

aqueous batteries; electrochemistry; energy storage; metal hexacyanoferrates; zinc

PMID:
25510850
DOI:
10.1002/cssc.201403143
[Indexed for MEDLINE]

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