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Conductive 2D metal-organic framework for high-performance cathodes in aqueous rechargeable zinc batteries
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Conductive 2D metal-organic framework for high-performance cathodes in aqueous rechargeable zinc batteries
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Journal Article
Conductive 2D metal-organic framework for high-performance cathodes in aqueous rechargeable zinc batteries
2019
Overview
Currently, there is considerable interest in developing advanced rechargeable batteries that boast efficient distribution of electricity and economic feasibility for use in large-scale energy storage systems. Rechargeable aqueous zinc batteries are promising alternatives to lithium-ion batteries in terms of rate performance, cost, and safety. In this investigation, we employ Cu
3
(HHTP)
2
, a two-dimensional (2D) conductive metal-organic framework (MOF) with large one-dimensional channels, as a zinc battery cathode. Owing to its unique structure, hydrated Zn
2+
ions which are inserted directly into the host structure, Cu
3
(HHTP)
2
, allow high diffusion rate and low interfacial resistance which enable the Cu
3
(HHTP)
2
cathode to follow the intercalation pseudocapacitance mechanism. Cu
3
(HHTP)
2
exhibits a high reversible capacity of 228 mAh g
−1
at 50 mA g
−1
. At a high current density of 4000 mA g
−1
(~18 C), 75.0% of the initial capacity is maintained after 500 cycles. These results provide key insights into high-performance, 2D conductive MOF designs for battery electrodes.
Aqueous zinc batteries are promising candidates for large scale energy storage systems but development of the cathode material remains a challenge. Here, the authors show a conductive 2D metal-organic framework involving intercalation pseudocapacitance mechanism for enhanced rate capability.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
