In this study, the use of exfoliation-restacking strategy to prepare mesoporous nanohybrids of 2D Nickel-chromium-layered double hydroxide (Ni-Cr-LDH) nanosheets pillared with polyoxovanadate (POV) anions (Ni-Cr-LDH-POV) for a high-performance hybrid supercapacitor (HSC) is demonstrated. The pillaring approach of Ni-Cr-LDH monolayers with POV anions via exfoliation-restacking strategy yields mesoporous ordered layered structure with a high surface area and interconnected network morphology. The pillared hybridization of Ni-Cr-LDH with POV anions boosts the electrochemical performance of the pristine Ni-Cr-LDH, which is attributed to the development of layer-by-layer stacking structure with expanded gallery height and high surface area interconnected network morphology. The Ni-Cr-LDH-POV nanohybrid electrode exhibits an improved specific capacity of 294.5 mAh g⁻¹ as compared to pristine Ni-Cr-LDH electrode (98.9 mAh g⁻¹) at 1 mA cm⁻² with 82% capacity retention after 5000 charge-discharge cycles. A full-cell HSC composed of mesoporous Ni-Cr-LDH-POV nanohybrid as a cathode and reduced graphene oxide (rGO) as an anode delivers a maximum specific energy of 57.78 Wh kg⁻¹ and specific power of 1.59 kW kg⁻¹ with 87% cyclic durability over 10 000 charge-discharge cycles. The present study demonstrates the usefulness of the pillared Ni-Cr-LDH-POV nanohybrids via exfoliation-restacking strategy for exploring high-performance HSC.

中文翻译：

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用多氧钒酸阴离子支撑的二维镍铬层状双氢氧化物纳米片的介孔纳米杂化物用于高性能混合超级电容器

在这项研究中，使用剥离-重堆叠策略制备了以聚氧钒酸盐 (POV) 阴离子 (Ni-Cr-LDH-POV) 为支柱的二维镍铬层状双氢氧化物 (Ni-Cr-LDH) 纳米片的介孔纳米杂化物。展示了高性能混合超级电容器 (HSC)。Ni-Cr-LDH 单层与 POV 阴离子通过剥离重堆叠策略的柱撑方法产生具有高表面积和互连网络形态的介孔有序层状结构。Ni-Cr-LDH 与 POV 阴离子的柱状杂化提高了原始 Ni-Cr-LDH 的电化学性能，这归因于具有扩展的通道高度和高表面积互连网络形态的逐层堆叠结构的发展.^-1与原始 Ni-Cr-LDH 电极（98.9 mAh g ^-1）相比，在 1 mA cm ^-2 5000 次充放电循环后容量保持率为 82%。孔性的Ni-Cr-LDH-POV纳米杂化物作为阴极和还原的石墨烯氧化物（RGO）作为阳极组成的全细胞提供HSC 57.78瓦公斤的最大比能量^-1和的比功率1.59千瓦千克^-1与87% 循环耐久性超过 10 000 次充放电循环。本研究通过剥离重堆叠策略证明了柱状 Ni-Cr-LDH-POV 纳米杂化物在探索高性能 HSC 方面的有用性。