Abstract MnO2/biomass-derived porous carbon (BPC) composites have been prepared by a hydrothermal method, in which the BPC 3D porous carbon structure was based on a banana peel. The banana peel, after freeze drying, can maintain its hierarchical natural porous structure, which provides enough growth space for MnO2 and reduces the agglomeration of MnO2 particles. The MnO2/BPC composites were characterized by XRD, FT-IR, XPS, TGA, SEM, TEM, BET. The electrochemical performance of the composites was tested in three-electrode supercapacitors using 1 M Na2SO4 aqueous solution as an electrolyte. Due to the large amounts of hierarchical pores and large pore volume, the as-prepared composites exhibited good electrochemical performance. Electrochemical measurements indicated that the MnO2/BPC composites applied in supercapacitors had a specific capacitance of 139.6 F g−1 at 300 mA g−1, and exhibited a good cycling stability with a capacitance retention ratio of 92.3% after 1000 cycles (at 1 A g−1). The MnO2/BPC composites with 3D porous structure are promising materials in the application of supercapacitors.

中文翻译：

---

用于高性能超级电容器应用的 MnO 2 和生物质衍生的 3D 多孔碳复合材料电极

摘要 MnO2/生物质衍生的多孔碳（BPC）复合材料已通过水热法制备，其中 BPC 3D 多孔碳结构基于香蕉皮。香蕉皮冷冻干燥后可保持其分层的天然多孔结构，为MnO2提供了足够的生长空间，减少了MnO2颗粒的团聚。通过XRD、FT-IR、XPS、TGA、SEM、TEM、BET对MnO2/BPC复合材料进行了表征。在使用 1 M Na2SO4 水溶液作为电解质的三电极超级电容器中测试复合材料的电化学性能。由于大量的分级孔和大孔体积，所制备的复合材料表现出良好的电化学性能。电化学测量表明，应用于超级电容器的 MnO2/BPC 复合材料在 300 mA g-1 下的比电容为 139.6 F g-1，并表现出良好的循环稳定性，1000 次循环（1 A g-1)。具有 3D 多孔结构的 MnO2/BPC 复合材料是超级电容器应用中很有前景的材料。