Construction of self-supported bimetallic MOF-mediated hollow and porous tri-metallic selenide nanosheet arrays as battery-type electrodes for high-performance asymmetric supercapacitors,Journal of Materials Chemistry A

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Construction of self-supported bimetallic MOF-mediated hollow and porous tri-metallic selenide nanosheet arrays as battery-type electrodes for high-performance asymmetric supercapacitors
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-06 , DOI: 10.1039/d1ta06209c
Jiwan Acharya _{1,

2} , Gunendra Prasad Ojha _{1,

2} , Bishweshwar Pant _{1,

2} , Mira Park _{1,

2}

Affiliation

The meticulous architecture of novel materials, integrating a rationally constructed highly conductive polyphase transition metal selenide with a carbonaceous nanostructure onto a 3D substrate has been acknowledging the challenging but appealing strategies for the development of auspicious electrode materials for energy storage devices. In this work, for the first time, hollow and porous nickel–zinc–cobalt selenide (Ni–Zn–Co–Se) nanosheet arrays were designated onto a chemically reduced rGO embellished Ni foam (rGO/NF) via a self-sacrificing template, ion exchange and selenization affair, where a Zn–Co-organic framework acts as a template. Ameliorating from the unique porous and hollow nanoarchitecture, the Ni–Zn–Co–Se@rGO/NF electrode tenders sheer electroactive sites, ample accessible territories for facile insertion of electrolytes and curtailed ion diffusion subways, reflecting the superlative electrochemical properties, in terms of an exceptional specific capacity of 464.4 mA h g⁻¹, an admirable rate performance of 68.9% and a remarkable cyclic life span of 93.24% after 7000 cycles in a three-electrode assembly for supercapacitors. To demonstrate the practical applicability, an asymmetric supercapacitor (ASC) device was assembled using Ni–Zn–Co–Se@rGO/NF and metal–organic framework-derived hollow porous carbon (MDHPC) as a positive and a negative electrode, respectively. The as-sandwiched Ni–Zn–Co–Se@rGO/NF//MDHPC ASC device exhibited a high energy density of 74.6 W h kg⁻¹ at a power density of 796.91 W kg⁻¹ with a remarkable durability of 96.4% after 7000 successive charge–discharge cycles.

中文翻译：

自支撑双金属MOF介导的空心和多孔三金属硒化物纳米片阵列的构建作为高性能非对称超级电容器的电池型电极

新型材料的精细结构，将合理构造的高导电多相过渡金属硒化物与碳质纳米结构集成到 3D 基板上，已经承认开发用于能量存储设备的吉祥电极材料具有挑战性但有吸引力的策略。在这项工作中，首次将空心多孔的镍-锌-钴硒化物（Ni-Zn-Co-Se）纳米片阵列指定到化学还原的 rGO 装饰的镍泡沫（rGO/NF）上，通过自我牺牲模板、离子交换和硒化作用，其中锌-钴有机骨架作为模板。改进独特的多孔和中空纳米结构，Ni-Zn-Co-Se@rGO/NF 电极提供了纯粹的电活性位点，为容易插入电解质和减少离子扩散地铁提供了充足的可及区域，反映了最高级的电化学性能，在464.4 mA hg ^-1的特殊比容量，在用于超级电容器的三电极组件中，在 7000 次循环后，具有令人钦佩的 68.9% 倍率性能和 93.24% 的显着循环寿命。为了证明其实用性，分别使用 Ni-Zn-Co-Se@rGO/NF 和金属-有机骨架衍生的中空多孔碳（MDHPC）作为正极和负极组装了不对称超级电容器（ASC）装置。夹心的 Ni-Zn-Co-Se@rGO/NF//MDHPC ASC 器件在796.91 W kg ^-1的功率密度下表现出 74.6 W h kg ^-1的高能量密度，并具有 96.4% 的显着耐久性。 7000 次连续充放电循环。

更新日期：2021-10-21

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