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Issue 37, 2016

High-energy lithium-ion hybrid supercapacitors composed of hierarchical urchin-like WO3/C anodes and MOF-derived polyhedral hollow carbon cathodes

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Abstract

A lithium-ion hybrid supercapacitor (Li-HSC) comprising a Li-ion battery type anode and an electrochemical double layer capacitance (EDLC) type cathode has attracted much interest because it accomplishes a large energy density without compromising the power density. In this work, hierarchical carbon coated WO3 (WO3/C) with a unique mesoporous structure and metal–organic framework derived nitrogen-doped carbon hollow polyhedra (MOF-NC) are prepared and adopted as the anode and the cathode for Li-HSCs. The hierarchical mesoporous WO3/C microspheres assembled by radially oriented WO3/C nanorods along the (001) plane enable effective Li+ insertion, thus exhibit high capacity, excellent rate performance and a long cycling life due to their high Li+ conductivity, electronic conductivity and structural robustness. The WO3/C structure shows a reversible specific capacity of 508 mA h g−1 at a 0.1 C rate (1 C = 696 mA h g−1) after 160 discharging–charging cycles with excellent rate capability. The MOF-NC achieved the specific capacity of 269.9 F g−1 at a current density of 0.2 A g−1. At a high current density of 6 A g−1, 92.4% of the initial capacity could be retained after 2000 discharging–charging cycles, suggesting excellent cycle stability. The Li-HSC comprising a WO3/C anode and a MOF-NC cathode boasts a large energy density of 159.97 W h kg−1 at a power density of 173.6 W kg−1 and 88.3% of the capacity is retained at a current density of 5 A g−1 after 3000 charging-discharging cycles, which are better than those previously reported for Li-HSCs. The high energy and power densities of the Li-HSCs of WO3/C//MOF-NC render large potential in energy storage.

Graphical abstract: High-energy lithium-ion hybrid supercapacitors composed of hierarchical urchin-like WO3/C anodes and MOF-derived polyhedral hollow carbon cathodes

Supplementary files

Article information


Submitted
11 jul 2016
Accepted
26 aug 2016
First published
29 aug 2016

Nanoscale, 2016,8, 16761-16768
Article type
Paper

High-energy lithium-ion hybrid supercapacitors composed of hierarchical urchin-like WO3/C anodes and MOF-derived polyhedral hollow carbon cathodes

J. Xu, Y. Li, L. Wang, Q. Cai, Q. Li, B. Gao, X. Zhang, K. Huo and P. K. Chu, Nanoscale, 2016, 8, 16761 DOI: 10.1039/C6NR05480C

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