Abstract
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 Cu3(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 Zn2+ ions which are inserted directly into the host structure, Cu3(HHTP)2, allow high diffusion rate and low interfacial resistance which enable the Cu3(HHTP)2 cathode to follow the intercalation pseudocapacitance mechanism. Cu3(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.
Highlights
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
We introduce the idea of utilizing a two-dimensional (2D) conductive metal-organic framework (MOF), Cu3(HHTP)[2] (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene)[28], as the cathode material for rechargeable aqueous zinc batteries (ZBs)
In summary, we have demonstrated a Cu3(HHTP)2 2D conductive MOF that may be utilized as a ZB cathode
Summary
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. Among the most suitable candidates for energy storage are lithium-ion batteries (LIBs) since they provide high performance in mobile devices, such as cellular phones and laptops Their utilization, in large-scale applications, such as electric vehicles, is inhibited by high material costs and safety concerns[4,5]. In order to resolve the limitations of LIBs, numerous investigations[4,5,6,7] have been focused on greener electrode materials and aqueous electrolytes From these perspectives, rechargeable aqueous zinc batteries (ZBs) have recently attracted[8,9,10,11,12,13] considerable attention for use in large-scale ESSs because of their high theoretical capacity (820 mAh g−1), their low toxicity, and the relatively low cost of zinc[14]. This work reveals the reason for the observed high rate performance and charge-storage mechanism of the Cu3(HHTP)[2], which is poised to facilitate the development of 2D conductive MOFs for energy storage
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