以植物膜作为碳源和模板，通过浸渍氯化锰溶液并经两次煅烧合成了石墨烯/氧化锰复合材料，分析了该复合材料的微观形貌、物相组成以及表面性能；将该复合材料制成电极，通过循环伏安和恒流充放电方法测试了其电化学性能。结果表明：石墨烯/氧化锰复合材料中不存在氧化石墨烯，其石墨烯为褶皱状片层结构，厚度约1.449 nm，其上负载着大量粒径为10~40 nm的氧化锰颗粒；该复合材料的BET比表面积约为202.5 m²·g^-1，孔径分布于5~30 nm；该复合材料的电化学反应可逆性优良，比电容为245 F·g^-1，远高于市购碳粉（25~26 F·g^-1）和植物膜煅烧制备石墨烯（45~50 F·g^-1）的。

A graphene/MnO₂ composite was prepared after dipping a plant membrane, which was used as both a carbon source and a template, into the manganese chloride solution and then calcining twice. The micromorphology, phase composition and surface property of the composite were analyzed. Then the composite was pressed to be an electrode and the electrochemical property was measured by cyclic voltammetry and constant current charge-discharge tests. The results show that there was no graphene oxide in the graphene/MnO₂ composite. The graphene showed a lamellar structure with wrinkles on it, whose thickness was 1.449 nm; there were lots of MnO₂ particles with the size of 10-40 nm and loaded on the graphene. The BET specific surface area of the composite was 202.5 m²·g^-1 and the pore size was 5-30 nm. The composite had an excellent electrochemical reversibility with the specific capacitance of 245 F·g^-1, which was much higher than that of commercial carbon powder (25-26 F·g^-1) and synthesized graphene by the plant membrane calcination (45-50 F·g^-1).