Nanostructured multicomponent hydroxide has recently drawn wide attention as positive material for high-performance supercapacitors. Herein, a multi-dimensional Co(OH)F@NiCo-LDH (LDH = layered double hydroxide) composite with layered nanocages has uniformly grown on nickel foam (NF) by a solvent-assisted process, which involves the in situ growth of ZIF-67 on the surface of Co(OH)F nanorods, followed by chemical etching of the hybrids. Benefiting from its subtle structural design, the Co(OH)F@NiCo-LDH exhibits high specific capacitance of 4070 mC cm⁻² at 1 mA cm⁻² (1313.3 C g⁻¹ at 1 A g⁻¹), desirable rate performance (3104 mC cm⁻² at 20 mA cm⁻²), and outstanding cycling stability (92.7% retention after 7000 cycles). Moreover, a two-electrode system assembled by Co(OH)F@NiCo-LDH and reduced graphene oxide exhibits a peak energy density of 49.34 Wh kg⁻¹ at the corresponding power density of 865 W kg⁻¹. These results demonstrate that the Co(OH)F@NiCo-LDH is an advanced positive material for the electrochemical device.

中文翻译：

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构建源自 ZIF-67 的 Co(OH)F Nanorods@NiCo-LDH Nanocages 用于高性能超级电容器

纳米结构的多组分氢氧化物最近作为高性能超级电容器的正极材料引起了广泛关注。在此，具有层状纳米笼的多维 Co(OH)F@NiCo-LDH（LDH = 层状双氢氧化物）复合材料通过溶剂辅助过程在镍泡沫（NF）上均匀生长，其中涉及 ZIF 的原位生长-67 在 Co(OH)F 纳米棒的表面，然后对杂化物进行化学蚀刻。受益于其微妙的结构设计，Co(OH)F@NiCo-LDH在 1 mA cm ^{-2 下}表现出 4070 mC cm ^{-2 的}高比电容（1313.3 C g ^-1在 1 A g ^{-1 下}），具有理想的倍率性能(3104 mC cm ^-2在 20 mA cm ^-2)，以及出色的循环稳定性（7000 次循环后保持率达 92.7%）。此外，由Co(OH)F@NiCo-LDH和还原氧化石墨烯组装的双电极系统在865 W kg ^-1的相应功率密度下表现出49.34 Wh kg ^-1的峰值能量密度。这些结果表明 Co(OH)F@NiCo-LDH 是一种先进的电化学装置正极材料。