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Issue 24, 2017
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Nanoconfinement of redox reactions enables rapid zinc iodide energy storage with high efficiency

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Abstract

A key challenge for present-day electric energy storage systems, such as supercapacitors and batteries, is to meet the world's growing demand for high performances, low cost, and environmental-friendliness. Here, we introduce a hybrid energy storage system combining zinc iodide (ZnI2) as redox electrolyte with a nanoporous activated carbon fiber (ACF) cathode and a zinc disk anode. We found that the nanopores (<1 nm) of ACF lead to a strong adsorption behavior of iodide and triiodide. Hence, this system exhibits low self-discharge rates without applying an ion exchange membrane. The high power performance (20.0 kW kg−1) originates from the enhanced redox kinetics of the iodide system as evidenced by electrochemical analysis. Considering the high specific energy (226 W h kg−1), the ACF/Zn ZnI2 battery represents an alternative for lead acid, Ni–Zn, and Ni–Cd batteries, while providing a supercapacitor-like power performance in the range of seconds to minutes charging times.

Graphical abstract: Nanoconfinement of redox reactions enables rapid zinc iodide energy storage with high efficiency

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Supplementary files

Article information


Submitted
26 Apr 2017
Accepted
25 May 2017
First published
25 May 2017

J. Mater. Chem. A, 2017,5, 12520-12527
Article type
Paper

Nanoconfinement of redox reactions enables rapid zinc iodide energy storage with high efficiency

J. Lee, P. Srimuk, S. Fleischmann, A. Ridder, M. Zeiger and V. Presser, J. Mater. Chem. A, 2017, 5, 12520
DOI: 10.1039/C7TA03589F

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