Ultrathin MnO2 nanosheets grown on fungal conidium-derived hollow carbon spheres as supercapacitor electrodes

作者：Mao, Cuiping; Liu, Sangui; Pang, Lei; Sun, Qi; Liu, Yang; Xu, Maowen^*; Lu, Zhisong^*

来源：RSC Advances, 2016, 6(7): 5184-5191.

DOI：10.1039/c5ra22193e

• HIGH-PERFORMANCE
• ASPERGILLUS-FLAVUS
• ELECTROCHEMICAL PERFORMANCE
• ENERGY-STORAGE
• POROUS CARBON
• HIGH-POWER
• CAPACITANCE
• SHELLS

Developmen(t) of biomass-derived carbon/MnO2 composites for energy applications has recently been attracting tremendous attention. However, the combination of MnO2 nanosheets and conidia-derived hollow carbon spheres for supercapacitor applications has never been realized. In this work, we develop a facile method to grow MnO2 nanosheets on hollow carbon spheres derived from Aspergillus flavus conidia. Ultrathin MnO2 nanosheets are uniformly grown on the surface of conidium-derived hollow carbon spheres. Sulfur element from the conidia is doped in the composites and the amount of MnO2 in the material is similar to 50.2 wt%. The as-prepared MnO2-carbon sphere composited electrode possesses a high specific capacitance of 263.5 F g (1) at 1 A g (1). After 2000 cycles, the specific capacitance value remains 83% of retention and the coulombic efficiency remains as high as 94%, demonstrating the excellent cycling stability.

• 出版日期2016
• 单位中国农业科学院; 西南大学