Abstract
Herein we present a simple method for fabricating core-shell mesostructured CuO@C nanocomposites by utilizing humic acid (HA) as a biomass carbon source. The electrochemical performances of CuO@C nanocomposites were evaluated as an electrode material for supercapacitors and lithium-ion batteries. CuO@C exhibits an excellent capacitance of 207.2 F g(-1) at a current density of 1 A g(-1) within a potential window of 0-0.46 V in 6 M KOH solution. Significantly, CuO electrode materials achieve remarkable capacitance retentions of approximately 205.8 F g(-1) after 1000 cycles of charge/discharge testing. The CuO@C was further applied as an anode material for lithium-ion batteries, and a high initial capacity of 1143.7 mA h g(-1) was achieved at a current density of 0.1 C. This work provides a facile and general approach to synthesize carbon-based materials for application in large-scale energy-storage systems.
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