Metal-Hydroxide Organic Frameworks for Aqueous Nickel-Zinc Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 39540558.
- Also identified by DOI 10.1021/acs.nanolett.4c04414.
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Abstract
Hydroxides exhibit a high theoretical capacity for energy storage by ion release and are often intercalated with anions to enhance the ion migration kinetics. In this study, a series of metal-hydroxide organic frameworks (MHOFs) are synthesized by intercalating aromatic organic linkers into hydroxides using I-M/Ni(OH)<sub>2</sub> (where M = Co<sup>2+</sup>, Cu<sup>2+</sup>, Mg<sup>2+</sup>, Fe<sup>2+</sup>). The coordination environment and layer spacing (1.09 nm) of I-M/Ni(OH)<sub>2</sub> are explored by X-ray absorption fine structure and cryo-electron microscopy. The intercalation nanostructure improves the conductivity of the hydroxides and facilitates Zn<sup>2+</sup> migration by increasing the interlayer spacing, while enhancing the rate capability and cycling stability. Consequently, the I-Co/Ni(OH)<sub>2</sub> material exhibites a satisfactory specific capacity of 0.35 mAh cm<sup>-2</sup> at 3 mA cm<sup>-2</sup> and a high peak power density of 6.78 mW cm<sup>-2</sup>. This study offers a novel perspective on the design of intercalated hydroxide and provides new insights into high-performance nickel-zinc batteres.