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首页> 外文期刊>Advanced energy materials >In Situ Formation of Co_9S_8 Quantum Dots in MOF-Derived Ternary Metal Layered Double Hydroxide Nanoarrays for High-Performance Hybrid Supercapacitors
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In Situ Formation of Co_9S_8 Quantum Dots in MOF-Derived Ternary Metal Layered Double Hydroxide Nanoarrays for High-Performance Hybrid Supercapacitors

机译：用于高性能混合超级电容器的MOF衍生的三元金属层状双氢氧化物纳米阵列中Co_9S_8量子点的原位形成

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Layered double hydroxides (LDHs) are promising cathode materials for supercapacitors because of the enhanced flow efficiency of ions in the interlayers. However, the limited active sites and monotonous metal species further hinder the improvement of the capacity performance. Herein, cobalt sulfide quantum dots (Co9S8-QDs) are effectively created and embedded within the interlayer of metal-organic-frameworks-derived ternary metal LDH nanosheets based on in situ selective vulcanization of Co on carbon fibers. The hybrid CF@NiCoZn-LDH/Co9S8-QD retains the lamellar structure of the ternary metal LDH very well, inheriting low transfer impedance of interlayer ions. Significantly, the selectively generated Co9S8-QDs expose more abundant active sites, effectively improving the electrochemical properties, such as capacitive performance, electronic conductivity, and cycling stability. Due to the synergistic relationship, the hybrid material delivers an ultrahigh electrochemical capacity of 350.6 mAh g(-1) (2504 F g(-1)) at 1 A g(-1). Furthermore, hybrid supercapacitors fabricated with CF@NiCoZn-LDH/Co9S8-QD and carbon nanosheets modified by single-walled carbon nanotubes display an outstanding energy density of 56.4 Wh kg(-1) at a power density of 875 W kg(-1), with an excellent capacity retention of 95.3% after 8000 charge-discharge cycles. Therefore, constructing hybrid electrode materials by in situ-created QDs in multimetallic LDHs is promising.
机译：层状双氢氧化物（LDH）是有希望的超级电容器阴极材料，因为中间层中离子的流动效率提高了。然而，有限的活性位点和单调的金属种类进一步阻碍了容量性能的提高。在此，基于钴在碳纤维上的原位选择性硫化，可有效地创建硫化钴量子点（Co9S8-QDs）并将其嵌入金属有机框架衍生的三元金属LDH纳米片的夹层中。杂化CF @ NiCoZn-LDH / Co9S8-QD很好地保留了三元金属LDH的层状结构，继承了层间离子的低转移阻抗。重要的是，选择性生成的Co9S8-QD暴露出更多的活性位，有效地改善了电化学性能，例如电容性能，电子电导率和循环稳定性。由于协同关系，杂化材料在1 A g（-1）时可提供350.6 mAh g（-1）（2504 F g（-1））的超高电化学容量。此外，用CF @ NiCoZn-LDH / Co9S8-QD和单壁碳纳米管改性的碳纳米片制造的混合超级电容器在875 W kg（-1）的功率密度下显示出56.4 Wh kg（-1）的出色能量密度。 ，在8000次充放电循环后具有95.3％的出色容量保持率。因此，通过在多金属LDH中原位生成的QD来构建混合电极材料是有前途的。

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