2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors,Batteries & Supercaps

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2‐nm‐Thick NiCo LDH@NiSe Single‐Crystal Nanorods Grown on Ni Foam as Integrated Electrode with Enhanced Areal Capacity for Supercapacitors
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-03 , DOI: 10.1002/batt.201900215
Chengxing Lu ₁ , Yu Yan ₁ , Tengfei Zhai ₁ , Yuzun Fan ₁ , Wei Zhou ₁

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It remains a great challenge to simultaneously guarantee the conductivity and high areal loading of active materials for integrated electrode of supercapacitors. Herein, we designed a hierarchical structure with cores of NiSe single‐crystal nanorods and sheaths of 2‐nm‐thick NiCo thin sheets grown on nickel foam (NiCo LDH@NiSe/NF) as integrated electrode. It reaches a high areal capacity of 1131 μAh cm⁻² at a current density of 5 mA cm⁻², which is 2.2 times of NiSe/NF (522 μAh cm⁻²) and 6.0 times of NiCo LDH/NF (189 μAh cm⁻²), superior to most reported integrated electrodes. The enhanced areal capacity can be ascribed to the high active material loading of 6.5 mg cm⁻² (twice more than other reported values) and considerable conductivity of single‐crystal NiSe nanorods of 2630 S cm⁻¹. The fabricated hierarchical integrated electrode of NiCo LDH@NiSe/NF assembled with activated carbon shows a maximum energy density of 0.454 mWh cm⁻² and a maximum power density of 80 mW cm⁻². This work presents supports of single‐crystal nanorods for thin LDH sheets to fabricate high‐density hierarchical structure for integrated electrode, which improves the conductivity and structural stability of active materials especially the LDHs, resulting in excellent electrochemical performance. It offers a promising approach to engineer and fabricate advanced supercapacitors with enhanced areal capacity.

中文翻译：

在Ni泡沫上生长的2纳米厚NiCo LDH @ NiSe单晶纳米棒作为集成电极，具有增强的超级电容器的地域容量

同时确保超级电容器集成电极的活性材料的导电性和高单位面积负载仍然是一个巨大的挑战。在本文中，我们设计了一种分层结构，其中以NiSe单晶纳米棒的芯和在泡沫镍（NiCo LDH @ NiSe / NF）上生长的2 nm厚的NiCo薄片的外壳作为集成电极。它在5 mA cm ^-2的电流密度下达到1131μAhcm ^-2的高面积容量，是NiSe / NF（522μAhcm ^-2）的2.2倍和NiCo LDH / NF（189μAhcm）的6.0倍^-2），优于大多数报道的集成电极。面积容量的增加可以归因于6.5 mg cm ^-2的高活性材料负载（比其他报告值高两倍），并且单晶NiSe纳米棒的电导率高达2630 S cm ^-1。组装有活性炭的NiCo LDH @ NiSe / NF分层集成电极的最大能量密度为0.454 mWh cm ^-2，最大功率密度为80 mW cm ^-2。这项工作提出了用于薄LDH片的单晶纳米棒的支撑物，以制造用于集成电极的高密度分层结构，从而改善了活性材料（尤其是LDH）的电导率和结构稳定性，从而具有出色的电化学性能。它提供了一种有前途的方法来设计和制造具有增强的面容量的高级超级电容器。

更新日期：2020-02-03

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