Herein, the supercapacitive characteristics of a novel nanocomposite based on defective mesoporous carbon (DMC) and MnO₂ is presented. DMC was obtained via a facile and low-cost synthesis route and its interconnected pore network was served as host matrix for the growth of MnO₂ nanoparticles to form the DMC/MnO₂ nanocomposite. The deposition of MnO₂ nanoparticles at the surface of DMC support was investigated using different structural analyses including FT-IR, Nitrogen adsorption/desorption, XRD, XPS, SEM and TEM. Compared to DMC and MnO₂ electrodes, the DMC/MnO₂ nanocomposite exhibited the highest specific capacitance reaching to 292 F g⁻¹ at current density of 0.5 A g⁻¹. Also, DMC/MnO₂ possessed good rate performance (61% capacity retention over 0.5–10 A g⁻¹) and cycling stability (21% capacity loss after 2000 charge/discharges cycles). Furthermore, a two-electrode symmetric supercapacitor device delivered a high specific energy of 34 W h kg⁻¹ at specific power of 100 W kg⁻¹.

在此，介绍了基于缺陷介孔碳 (DMC) 和 MnO ₂的新型纳米复合材料的超级电容特性。DMC 是通过一种简便且低成本的合成途径获得的，其互连的孔网络用作 MnO ₂纳米颗粒生长的基质，以形成 DMC/MnO ₂纳米复合材料。使用不同的结构分析，包括 FT-IR、氮吸附/解吸、XRD、XPS、SEM 和 TEM，研究了 MnO ₂纳米颗粒在 DMC 载体表面的沉积。与DMC和MnO ₂电极相比，DMC/MnO ₂纳米复合材料表现出最高的比电容，达到292 F g ^-1在0.5 A g ^{-1 的}电流密度下。此外，DMC/MnO ₂具有良好的倍率性能（0.5-10 A g ^{-1 的}容量保持率为61% ）和循环稳定性（2000 次充电/放电循环后容量损失为21%）。此外，双电极对称超级电容器装置在100 W kg ^{-1 的}比功率下提供了34 W h kg ^-1的高比能量。