PDF(Pubmed)
Abstract：
The rational fabrication of composite structures made of mixed components has shown great potential for boosting the energy density of supercapacitors. Herein, an elaborate hierarchical MOF-derived NiCo2S4@Mo-doped Co-LDH arrays hybrid electrode was fabricated through a step-wise method. By leveraging the synergistic effects of a uniform array of NiCo2S4 nanowires as the core and an MOF-derived porous shell, the NiCo2S4@Mo-doped Co-LDH hybrid electrode demonstrates an exceptional specific capacitance of 3049.3 F g-1 at 1 A g-1. Even at a higher current density of 20 A g-1, the capacitance remains high at 2458.8 F g-1. Moreover, the electrode exhibits remarkable cycling stability, with 91% of the initial capacitance maintained after 10,000 cycles at 10 A g-1. Additionally, the as-fabricated asymmetric supercapacitor (ASC) based on the NiCo2S4@Mo-doped Co-LDH electrode achieves an impressive energy density of 97.5 Wh kg-1 at a power density of 835.6 W kg-1. These findings provide a promising approach for the development of hybrid-structured electrodes, enabling the realization of high-energy-density asymmetric supercapacitors.
摘要：
由混合组分制成的复合结构的合理制造显示出提高超级电容器能量密度的巨大潜力。在这里，通过分步方法制备了精细的分层MOF衍生的NiCo2S4@Mo掺杂的Co-LDH阵列混合电极。通过利用NiCo2S4纳米线的均匀阵列作为核心和MOF衍生的多孔壳的协同效应，NiCo2S4@Mo掺杂的Co-LDH混合电极在1Ag-1时显示出3049.3Fg-1的特殊比电容。即使在20Ag-1的较高电流密度下，电容仍保持在2458.8Fg-1。此外，电极表现出显著的循环稳定性，在10,000次循环后，初始电容的91%保持在10g-1。此外,基于NiCo2S4@Mo掺杂的Co-LDH电极的制造的非对称超级电容器（ASC）在835.6Wkg-1的功率密度下实现了97.5Whkg-1的令人印象深刻的能量密度。这些发现为混合结构电极的开发提供了一种有希望的方法，实现高能量密度的非对称超级电容器。
