Li Mengyao, Wang Lixin, Xiong Wanning, Zhao Linlin, Tian Yi, Cheng Mengting, Wang Yuzhu, Li Zejun, Wang Xinjun, Sheng Qingquan, Luo Yongfeng
Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, College of Science, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China.
Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, College of Science, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China; Department of Science and Technology, Hunan Automotive Engineering Vocational College, Zhuzhou, Hunan 412001, PR China.
J Colloid Interface Sci. 2024 Oct 15;672:392-400. doi: 10.1016/j.jcis.2024.06.014. Epub 2024 Jun 4.
The rational design and synthesis of carbon nanocages with highly complex porous structures are continuously facing challenges in the development of high-performance supercapacitors (SCs). The electrochemical performance characteristics of electrodes rely on their compositions and fabrication methods. Here, we propose a universal and efficient approach for the in-situ synthesis of zeolitic imidazolate framework-8 (ZIF-8) on porous carbonized wood, where the selective utilization of hexacarbonyl molybdenum protects the structural integrity of the ZIF-8 precursor, preventing collapse during thermal treatment. The subsequent pyrolysis process leads to the formation of small-sized molybdenum carbide (MoC) which are embedded in carbon nanocages (CN). The composite electrode consists of MoC/CN embedded in a porous carbonized wood (PCW), and it shows area-specific capacity of 9.7F cm and 9.4 F cm at 5 mA cm and 30 mA cm, respectively. Subsequently, the symmetric supercapacitor, with two MoC/CN@PCW electrodes exhibits a areal specific capacitance of 2.7 F cm at 5 mA cm. Moreover, this supercapacitor maintains an capacitance retention rate of 98.5 % after 12,000 discharge cycles. The supercapacitor exhibits a power density of 6.5 mW cm, resulting in an energy density of 0.864 mWh cm. Therefore, the utilization of wood-based electrodes holds promise for energy storage systems.
在高性能超级电容器（SCs）的开发中，具有高度复杂多孔结构的碳纳米笼的合理设计与合成一直面临挑战。电极的电化学性能特征取决于其组成和制备方法。在此，我们提出了一种在多孔碳化木材上原位合成沸石咪唑酯骨架-8（ZIF-8）的通用高效方法，其中六羰基钼的选择性利用保护了ZIF-8前驱体的结构完整性，防止其在热处理过程中坍塌。随后的热解过程导致形成嵌入碳纳米笼（CN）中的小尺寸碳化钼（MoC）。复合电极由嵌入多孔碳化木材（PCW）中的MoC/CN组成，在5 mA cm和30 mA cm下分别显示出9.7F cm和9.4 F cm的面积比电容。随后，具有两个MoC/CN@PCW电极的对称超级电容器在5 mA cm下表现出2.7 F cm的面积比电容。此外，该超级电容器在12000次放电循环后保持98.5%的电容保持率。该超级电容器的功率密度为6.5 mW cm，能量密度为0.864 mWh cm。因此，木质基电极在储能系统中具有应用前景。
