Ultra-high rate capability of nanoporous carbon network@V2 O5 sub-micron brick composite as a novel cathode material for asymmetric supercapacitors

Nanoscale
Yue JiaoJian Li

Abstract

A green biomass-derived nanoporous carbon network (NCN) has been prepared and integrated with V2O5 sub-micron bricks (SMBs). The large surface area and high pore volume of the NCN can not only provide abundant sites for electrochemical reactions but also stabilize the structure of the V2O5 SMBs. The NCN@V2O5 SMB composite, acting as a novel cathode material, delivers a high areal capacitance of 786 mF cm-2 at 0.2 mA cm-2 and superior cycling stability with 89.5% capacitance retention after 5000 cycles. Besides, the electrode achieves an ultra-high rate capability (82% capacitance retention as the current density increases from 0.2 to 5 mA cm-2) since the contribution from the non-diffusion-controlled process is estimated to be as high as 95.5%-98.5% according to the kinetic analysis. Furthermore, the micropores are more favorable than the mesopores at lower current densities (0.2-2 mA cm-2), while the contribution of the external surface area becomes more significant for current densities higher than 2 mA cm-2. Moreover, an asymmetric supercapacitor assembled using this cathode and the NCN anode shows superior electrochemical properties, such as wide operating voltage, long cycle life and large energy density (72.2 μW h cm-2). ...Continue Reading

References

Mar 8, 2011·Chemical Reviews·Zhenguo YangJun Liu
Sep 6, 2011·Journal of the American Chemical Society·M SathiyaA K Shukla
Sep 29, 2011·Advanced Materials·Yunpu ZhaiSheng Dai
Aug 24, 2012·ACS Applied Materials & Interfaces·B SaravanakumarG Muralidharan
Dec 10, 2013·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Hui ZhangXingyou Tian
Jun 9, 2015·Chemical Society Reviews·Cheng ZhongJiujun Zhang
Jul 30, 2019·ACS Applied Materials & Interfaces·Ming-Jay DengTzung-Han Chou

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