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Issue 2, 2019
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Unveiling dual-linkage 3D hexaiminobenzene metal–organic frameworks towards long-lasting advanced reversible Zn–air batteries

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Abstract

Advanced Zn–air batteries (ZABs) with ultrahigh cycle life, which also harness energy with bifunctional electrochemical reactions, are significantly challenging for the commercialization of hybrid/electric vehicles and wearable electronics. Herein, we demonstrated robust aqueous and flexible ZABs with novel three-dimensional dual-linked hexaiminobenzene metal–organic framework (Mn/Fe-HIB-MOF)-based bifunctional oxygen electrocatalysts and superionic functionalized bio-cellulose electrolytes (64 mS cm−1). The well-defined quintet-shelled hollow sphere MOFs possess a hierarchical porous structure, excellent packing density with a surface area of 2298 m2 g−1, and chemical stability as compared to conventional MOFs. Mn/Fe-HIB-MOF exhibited superior bifunctional oxygen electrocatalytic activity (0.627 V) with half-wave potential (0.883 V) for oxygen reduction and overpotential (280 mV@10 mA cm−2) for oxygen evolution reactions, outperforming commercial Pt/C and RuO2. Their favorable oxygen reactions and surface electronic structures were confirmed by density functional theory. Significantly, the Mn/Fe-HIB-MOF cathode demonstrated the highest lifetimes reported to date for rechargeable ZABs, namely 1000 h (0.75 V voltage gap@10 mA cm−2) over 6000 cycles and 600 h (efficiency ∼65.24%@25 mA cm−2) over 3600 cycles with excellent flexibility for liquid and all-solid-state flexible ZABs, respectively. These promising results illustrate the great potential of these novel hexaiminobenzene MOFs and superionic bio-cellulose membranes for the commercial implementation of rechargeable ZABs.

Graphical abstract: Unveiling dual-linkage 3D hexaiminobenzene metal–organic frameworks towards long-lasting advanced reversible Zn–air batteries

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Supplementary files

Article information


Submitted
13 Sep 2018
Accepted
04 Jan 2019
First published
22 Jan 2019

Energy Environ. Sci., 2019,12, 727-738
Article type
Paper

Unveiling dual-linkage 3D hexaiminobenzene metal–organic frameworks towards long-lasting advanced reversible Zn–air batteries

S. S. Shinde, C. H. Lee, J. Jung, N. K. Wagh, S. Kim, D. Kim, C. Lin, S. U. Lee and J. Lee, Energy Environ. Sci., 2019, 12, 727
DOI: 10.1039/C8EE02679C

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