Hydrangea-like multi-scale carbon hollow submicron spheres with hierarchical pores for high performance supercapacitor electrodes

作者：Guo, Daying; Chen, Xi'an^*; Fang, Zhipeng; He, Yufeng; Zheng, Cong; Yang, Zhi; Yang, Keqin; Chen, Ying; Huang, Shaoming

来源：Electrochimica Acta, 2015, 176: 207-214.

DOI：10.1016/j.electacta.2015.07.032

• Hydrangea-like
• carbon hollow submicron spheres
• mesoporous channels
• supercapacitor
• gravimetric and volumetric capacitance

Uniform hydrangea-like multi-scale carbon hollow submicron spheres (HCSSg) are fabricated by a simple hydrothermal method using glucose as carbon source and fibrous silicon dioxides spheres as shape guide. Structure characterization suggests that petal-like partially graphitized carbon nanosheets with the thickness of about 10 nm arranged in three dimensions (3D) to form the hydrangea-like hollow spheres (size ranging from 250 to 500 nm) with mesoporous channels, which can be conducive to be a high specific surface area (934 m(2) g(-1)) and bulk density (0.87 cm g(-3)), hierarchical pores structure with good conductivity. As a result, the HCSSg has been demonstrated to be a supercapacitor electrode material with high gravimetric (386 F g(-1) at 0.2 A g(-1)) and outstanding volumetric (335 F cm(-3)) capacitance, good rate capability and cycling stability with 94% capacitance retention after 5000 cycles in aqueous electrolytes, thus suggesting its application potential.

• 出版日期2015-9-10
• 单位迪肯大学; 温州大学