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)₂ (where M = Co²⁺, Cu²⁺, Mg²⁺, Fe²⁺). The coordination environment and layer spacing (1.09 nm) of I-M/Ni(OH)₂ are explored by X-ray absorption fine structure and cryo-electron microscopy. The intercalation nanostructure improves the conductivity of the hydroxides and facilitates Zn²⁺ migration by increasing the interlayer spacing, while enhancing the rate capability and cycling stability. Consequently, the I-Co/Ni(OH)₂ material exhibites a satisfactory specific capacity of 0.35 mAh cm^–2 at 3 mA cm^–2 and a high peak power density of 6.78 mW cm^–2. This study offers a novel perspective on the design of intercalated hydroxide and provides new insights into high-performance nickel-zinc batteres.

中文翻译：

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用于水系镍锌电池的金属氢氧化物有机框架


氢氧化物通过离子释放表现出很高的理论储能能力，并且通常与阴离子嵌入以增强离子迁移动力学。在本研究中，通过使用 I-M/Ni（OH）₂ 将芳香族有机接头嵌入氢氧化物中来合成一系列金属氢氧化物有机框架 （MHOFs）（其中 M = Co²⁺、Cu²⁺、Mg²⁺、Fe²⁺）。通过 X 射线吸收精细结构和冷冻电子显微镜探索了 IM/Ni（OH）₂ 的配位环境和层间距 （1.09 nm）。插层纳米结构提高了氢氧化物的电导率，并通过增加层间间距促进了 Zn²⁺ 迁移，同时增强了速率能力和循环稳定性。因此，I-Co/Ni（OH）₂ 材料在 3 mA cm^–2 处表现出令人满意的 0.35 mAh cm^–2 比容量和 6.78 mW cm^–2 的高峰值功率密度。本研究为插层氢氧化物的设计提供了新的视角，并为高性能镍锌电池提供了新的见解。