Engineering the Hierarchical Heterostructures of Zn–Ni–Co Nanoneedles Arrays@Co–Ni-LDH Nanosheets Core–Sheath Electrodes for a Hybrid Asymmetric Supercapacitor with High Energy Density and Excellent Cyclic Stability,ACS Applied Energy Materials

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Engineering the Hierarchical Heterostructures of Zn–Ni–Co Nanoneedles Arrays@Co–Ni-LDH Nanosheets Core–Sheath Electrodes for a Hybrid Asymmetric Supercapacitor with High Energy Density and Excellent Cyclic Stability
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-07-06 , DOI: 10.1021/acsaem.0c00781
Jiwan Acharya ₁ , Tae Hoon Ko _{1,

2} , Min-Kang Seo ₃ , Myung-Seob Khil ₂ , Hak-Yong Kim _{1,

2} , Byoung-Suhk Kim _{1,

2,

4}

Affiliation

To meet the requirement for the high-ranked positive electrode materials having auspicious pseudocapacitive features for potential application in energy storage devices, the suitable designs of unique core–shell heterostructures featuring mixed transition metal oxide and layered double hydroxide (LDH) are highly needed and have been progressing expeditiously in recent years. Herein, 3D hierarchical zinc–nickel–cobalt (ZNCO)@Co–Ni-LDH (LDH-1 and LDH-2) core–shell nanostructured arrays on Ni foam as a pseudocapacitive electrode are prepared by using a facile hydrothermal and metal–organic framework (MOF) assisted coprecipitation method. FE-SEM images show that the core 1D ZNCO and shell 2D Co–Ni-LDH are well interconnected to form 3D porous and hierarchical ZNCO@Co–Ni-LDH core–shell nanostructures, leading to the fast and efficient transmission/transfer of both electrolyte ions and electrons, due to the higher electroactive surface areas and enhanced electrical conductivity. In a three-electrode system, the ZNCO@Co–Ni-LDH-2 electrode material delivers excellent electrochemical performance with higher specific capacitance of 2866 F g^–1 at 1 A g^–1 with ultrahigh capacitance retention of 68.35% at a higher current density of 10 A g^–1 and excellent life span of 89% capacitance retention after 8000 cycles. Moreover, the sandwiched asymmetric supercapacitor (ASC) device using ZNCO@Co–Ni-LDH-2 as the positive electrode and N-doped graphene hydrogel (NGH) as the negative electrode exhibits superior specific capacitance (178 F g^–1 at 1 A g^–1), outstanding rate capability (70.22% at 10 A g^–1), excellent life span (91.2% after 8000 cycles at 10 A g^–1), and very high energy density (63.28 W h kg^–1 at power density of 796.53 W kg^–1).

中文翻译：

设计具有高能量密度和出色循环稳定性的混合型不对称超级电容器的Zn-Ni-Co纳米簇阵列@ Co-Ni-LDH纳米片芯-鞘电极的分层异质结构

为了满足具有吉祥伪电容特性的高级正电极材料在储能设备中的潜在应用需求，迫切需要具有混合过渡金属氧化物和层状双氢氧化物（LDH）的独特核-壳异质结构的合适设计。近年来一直在迅速发展。在此，通过使用方便的水热和金属有机物，在镍泡沫上作为伪电容电极制备了3D分层锌-镍-钴（ZNCO）@ Co-Ni-LDH（LDH-1和LDH-2）核-壳纳米结构阵列。框架（MOF）辅助共沉淀方法。FE-SEM图像显示，核心1D ZNCO和壳层2D Co-Ni-LDH相互连接良好，形成了3D多孔且分层的ZNCO @ Co-Ni-LDH核壳纳米结构，由于较高的电活性表面积和增强的电导率，导致电解质离子和电子的快速有效传输/转移。在三电极系统中，ZNCO @ Co-Ni-LDH-2电极材料可提供出色的电化学性能，并具有2866 F g的更高比电容^-1 1个A G ^-1以10 g的更高的电流密度与超高电容的68.35％的保留^-1和89％的电容保持的优异的寿命跨度8000次循环之后。此外，使用ZNCO @ Co-Ni-LDH-2作为正电极和N掺杂石墨烯水凝胶（NGH）作为负电极的夹心非对称超级电容器（ASC）器件具有优异的比电容（1 A时为178 F g ^–1 g ^–1），出色的速率能力（10 A g ^–1时为70.22％），出色的寿命（10 A g ^–1 8000次循环后为91.2％）和非常高的能量密度（功率为63.28 W h kg ^–1密度为796.53 W kg ^–1）。

更新日期：2020-07-06

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