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Rational construction of MOF-derived Zn-Co-O/NiCo-LDH core/shell nanosheet arrays on nickel foam for high-performance supercapacitors
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-06-23 , DOI: 10.1016/j.jallcom.2021.160931
Manlin Zhu , Wangfeng Cai , Hongbo Wang , Leqiu He , Yan Wang

A morphologically adjustable metal-organic framework (MOF) template and a unique hierarchical structure show improved electrochemical performance of electrode materials for supercapacitors. Herein, Zn/Co-MOF-derived zinc-cobalt oxide/nickel cobalt layered double hydroxides (Zn-Co-O/NiCo-LDH) hierarchical core/shell nanostructures on nickel foam (NF) were synthesized by simple methods and exhibited high specific capacitance. The results showed that both the reasonable morphology of the MOF-templated continuous nanosheet network and synergy between transition bimetallic oxides and transition bimetallic hydroxide played an important role in improving the electrochemical properties. Hence, the as-prepared Zn-Co-O/NiCo-LDH battery-type electrode exhibited excellent specific capacitance of 2275.2 F/g at 1 A/g and remarkable cycling stability of 82.4% capacitance retention after 5000 cycles. Moreover, the as-prepared Zn-Co-O/NiCo-LDH was used as the positive electrode to assemble a hybrid supercapacitor (HSC) device, which attained a distinguished energy density of 44.5 W h/kg at a power density of 800 W/kg and satisfactory stability (71.5% retention after 5000 cycles). It was concluded that MOF-templated core/shell heterostructures in electrode materials have broad prospects and great potential for energy storage.



中文翻译:

MOF衍生的Zn-Co-O/NiCo-LDH核/壳纳米片阵列在泡沫镍上的合理构建,用于高性能超级电容器

形态可调的金属有机骨架 (MOF) 模板和独特的分层结构显示出超级电容器电极材料的电化学性能得到改善。在此,Zn/Co-MOF 衍生的锌钴氧化物/镍钴层状双氢氧化物 (Zn-Co-O/NiCo-LDH) 在镍泡沫 (NF) 上通过简单的方法合成并表现出高特异性电容。结果表明,MOF 模板化连续纳米片网络的合理形态以及过渡双金属氧化物和过渡双金属氢氧化物之间的协同作用对提高电化学性能起到了重要作用。因此,所制备的 Zn-Co-O/NiCo-LDH 电池型电极 在 1 A/g 和显着的循环稳定性,5000 次循环后电容保持率为 82.4%。此外,所制备的 Zn-Co-O/NiCo-LDH 用作正极组装混合超级电容器 (HSC) 装置,在 800 W的功率密度下获得了 44.5  W  h/kg的杰出能量密度 /kg 和令人满意的稳定性(5000 次循环后保留 71.5%)。结论是,电极材料中以 MOF 为模板的核/壳异质结构具有广阔的前景和巨大的储能潜力。

更新日期:2021-06-23
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