In this study, nickel cobaltite/mesoporous carbon composites are synthesized by reacting CoCl₂, Ni (NO₃)₂ and nitric acid-treated biogas slurry mesoporous carbon using urea as hydrolyzing agent and hexadecyltrimethylammonium bromide (CTAB) as surfactant. The presence of Ni, Co, C and O peaks in the EDX results confirm that the composites are successfully synthesized. Interestingly at 350 °C, the composite surface morphology switched to cross-linked nanoflake structures interconnected with mesoporous carbon. The X-ray diffraction analysis of the NiCo₂O₄/mesoporous carbon composites reveals that the spinel structure of the NiCo₂O₄ is maintained in the composites. The nitrogen uptake increases with increasing annealing temperature to 300 °C then decreases at higher temperature (400 °C). The type IV isotherms are exhibited by all the composites. The contribution of mesopores increases with increasing annealing temperature: 32% for BC-NCo-200, 41% for BC-NCo-250, 56% for BC-NCo-300, 66% for BC-NCo-350 and 86% for BC-NCo-400. The NiCo₂O₄/mesoporous carbon composites exhibit high specific capacitance of 835 F g⁻¹ at scan rate of 5 mV s⁻¹ for sample annealed at 350 °C. The cyclic stabilities of the electrodes are above 90% after 50,000 cycles indicating that the synthesized composites are suitable candidates for supercapacitors.

在这项研究中，通过使用尿素作为水解剂和十六烷基三甲基溴化铵（CTAB）作为表面活性剂，使CoCl ₂，Ni（NO ₃）₂和硝酸处理过的沼气中孔碳反应，合成了镍钴/介孔碳复合材料。EDX结果中Ni，Co，C和O峰的存在证实了复合材料已成功合成。有趣的是，在350°C下，复合材料的表面形态转变为与中孔碳互连的交联纳米薄片结构。的镍钴的X射线衍射分析₂ ö ₄ /孔碳复合材料揭示的镍钴尖晶石结构₂ ö ₄被保留在复合材料中。氮吸收量随退火温度升高至300°C而增加，然后在较高温度（400°C）时降低。所有复合材料均表现出IV型等温线。中孔的贡献随着退火温度的升高而增加：BC-NCo-200为32％，BC-NCo-250为41％，BC-NCo-300为56％，BC-NCo-350为66％，BC为86％ -NCo-400。对于在350°C退火的样品，NiCo ₂ O ₄ /中碳复合材料在5 mV s ^-1的扫描速率下显示出835 F g ^-1的高比电容。50,000次循环后，电极的循环稳定性高于90％，这表明合成的复合材料适合用作超级电容器。