Qiu Liqing, Liu Hangzhong, He Chenweijia, He Shuijian, Liu Li, Zhang Qian
Fujian Provincial Key Laboratory of Eco-Industrial Green Technology, College of Ecology and Resources Engineering, Wuyi University, Wuyishan 354300, China.
Department of Chemistry and Chemical Engineering, Nanofiber Engineering Center of Jiangxi Province, Jiangxi Normal University, Nanchang 330022, China.
Molecules. 2024 May 28;29(11):2532. doi: 10.3390/molecules29112532.
The hierarchical porous carbon-based materials derived from biomass are beneficial for the enhancement of electrochemical performances in supercapacitors. Herein, we report the fabrication of nitrogen-doped 3D flower-like hierarchical porous carbon (NPC) assembled by nanosheets using a mixture of urea, ZnCl, and starch via a low-temperature hydrothermal reaction and high-temperature carbonization process. As a consequence, the optimized mass ratio for the mixture is 2:2:2 and the temperature is 700 °C. The NPC structures are capable of electron transport and ion diffusion owing to their high specific surface area (1498.4 m g) and rich heteroatoms. Thereby, the resultant NPC electrodes display excellent capacitive performance, with a high specific capacitance of 249.7 F g at 1.0 A g and good cycling stability. Remarkably, this implies a superior energy density of 42.98 Wh kg with a power density of 7500 W kg in organic electrolyte for the symmetrical supercapacitor. This result verifies the good performance of as-synthesized carbon materials in capacitive energy storage applications, which is inseparable from the hierarchical porous features of the materials.
源自生物质的分级多孔碳基材料有利于提升超级电容器的电化学性能。在此，我们报道了通过低温水热反应和高温碳化过程，使用尿素、ZnCl和淀粉的混合物制备由纳米片组装而成的氮掺杂三维花状分级多孔碳（NPC）。结果，混合物的优化质量比为2:2:2，温度为700°C。NPC结构由于其高比表面积（1498.4 m²/g）和丰富的杂原子而能够进行电子传输和离子扩散。因此，所得的NPC电极表现出优异的电容性能，在1.0 A/g时具有249.7 F/g的高比电容和良好的循环稳定性。值得注意的是，这意味着在有机电解质中，对称超级电容器的能量密度高达42.98 Wh/kg，功率密度为7500 W/kg。该结果验证了所合成碳材料在电容式储能应用中的良好性能，这与材料的分级多孔特征密不可分。
