Background: In the energy-storage systems, supercapacitors have a wide range of
applications in such as consumer electronics and hybrid electric vehicles because they are
able to store and deliver energy at high rate. Nanocarbons and their composites have large
specific surface area, high electronic conductivity and excellent chemical stability, promising
for the electrode materials of supercapacitors.
Methods: We briefly review the recent researches and advancements of supercapacitors based
on nanocarbons and nanocarbon-composites. We also discussed the implications of their
nanostructures on the performance of supercapacitor.
Results: Based on the analysis of 127 references, this paper described the synthesis and electrochemical
properties of nanocarbons and their composites such as N-doped carbons, carbon
allotrope composites, metal oxides/graphene composites, sulfides/nanocarbon composites and
conductive polymer/nanocarbon composites.
Conclusion: Nanocarbons-based supercapacitors have good properties such as high specific
capacitance and ultra fast charge-discharge rate. Because the nanostructured carbons of high
quality are the key for high-performance of supercapacitors in particular, simple and bulk
scale synthesis needs to stir up in the future. Exploitation of new and cheap nanocarbon-based
materials with electrolyte ions accessible nanopore structures are highly recommended. On
the other hand, problems from the morphology effects and aggregated nanostructures hinder
the complete utilization of the nanostructures and must be solved in future work. Most importantly,
understanding the relationship with nanopore structures and capacitance uptakes is urgent
for the design of the practical supercapacitor device.