A simple strategy toward hierarchically porous graphene/nitrogen-rich carbon foams for high-performance supercapacitors

作者：Chen, Yue; Xiao, Zechuan; Liu, Yongchang; Fan, Li-Zhen^*

来源：Journal of Materials Chemistry A, 2017, 5(46): 24178-24184.

DOI：10.1039/c7ta09039k

• ELECTROCHEMICAL ENERGY-STORAGE
• SOLID-STATE SUPERCAPACITORS
• GRAPHENE OXIDE
• SUPERIOR PERFORMANCE
• KOH ACTIVATION
• HIGH-CAPACITY
• SURFACE-AREA
• SPONGE
• DESIGN
• ELECTRODES

Three-dimensional nitrogen-rich porous carbon materials (NPCs), with advantageously tuned physicochemical properties through nitrogen functionalities, have become the research hotspot of energy storage. As electrodes for supercapacitors, NPCs fabricated via a facile strategy are highly desirable to improve the limited performance of N-doped species and obtain high specific capacitance. Herein, a graphene/nitrogen-rich carbon foam with a 3D hierarchically porous architecture has been achieved through assembling graphene oxide sheets into melamine foam. The obtained foam with meso-and micro-pores, nitrogen-enriched content (11.6 at%), and a large surface area (943.7 m(2) g(-1)) delivers enhanced energy storage capabilities of 324, 229, and 196 F g(-1) at current densities of 0.1, 1, and 10 A g (1) in a 6 mol L (1) KOH electrolyte, respectively. Moreover, the as-prepared material shows an appreciable capacitance of up to 213 F g(-1) at 0.1 A g(-1), along with excellent cycling stability (99% retention after 10 000 cycles in a PVA/KOH gel electrolyte) in the related fabricated symmetric solid-state supercapacitors.

• 出版日期2017-12-14
• 单位北京科技大学