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ArticleA Metal-Organic Framework Host for Highly Reversible Dendrite-free Zinc Metal Anodes
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Aqueous Zn-based batteries and supercapacitors have been considered as promising candidates for electrochemical energy storage devices because of the inherent advantages of metallic Zn. Unfortunately, the stability of the Zn anode in the mild electrolyte is still much limited by the dendrite growth, undesired hydrogen evolution, and the formation of inert “dead” Zn. Here, we report the utilization of MOF ZIF-8 treated with an optimized temperature (500°C) as a host material for the development of highly stable and dendrite-free Zn metal anodes. The ZIF-8-500 anode exhibits unprecedented reversibility of Zn plating/stripping behavior, high Coulombic efficiency (close to 100%), and dendrite-free Zn. The novel Zn@ZIF-8-500 anode coupled with an activated carbon cathode or an I2 cathode works well. This work represents a new and low-cost avenue for developing a highly reversible zinc metal anode.
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