Quinone‐Decorated Onion‐Like Carbon/Carbon Fiber Hybrid Electrodes for High‐Rate Supercapacitor Applications

Abstract

The energy performance of carbon onions can be significantly enhanced by introducing pseudocapacitive materials, but this is commonly at the cost of power handling. In this study, a novel synergistic electrode preparation method was developed by using carbon‐fiber substrates loaded with quinone‐decorated carbon onions. The electrodes are free standing, binder free, extremely conductive, and the interfiber space filling overcomes the severely low apparent density commonly found for electrospun fibers. Electrochemical measurements were performed in organic and aqueous electrolytes. For both systems, a high electrochemical stability after 10 000 cycles was measured, as well as a long‐term voltage floating test for the organic electrolyte. The capacitance in 1 M H2SO4 was 288 F g−1 for the highest loading of quinones, which is similar to literature values, but with a very high power handling, showing more than 100 F g−1 at a scan rate of 2 Vs−1.

2D Layered α‐Fe2O3/rGO Flexible Electrode Prepared through Colloidal Electrostatic Self‐Assembly

“…The rapid development of portable consumer electronics, such as flexible displays, mobile phones and digital cameras, becomes more and more urgent for developing ultrathin and superior flexibility energy storage device . As a promising energy storage devices, supercapacitor have attracted great attention owing to their high power density, fast charging/discharging rate and long cycle life . However, current research on supercapacitors has focused on their applications in electric vehicles, hybrid electric vehicles, and backup energy sources.…”

MOF‐Derived Porous NixFe3‐xO4 Nanotubes with Excellent Performance in Lithium‐Ion Batteries

“…High-performance lithium-ion batteries (LIBs) and their commercialization in large-scale energy-storage equipment have been popular topics of discussion both in academia and industry, [1][2][3] with ar apidly growingc ustomer requirement for the improvement of LIBs with highere nergy density,b etter rate capability,a nd longer cycling life. [4][5][6][7] However,t he current commercial graphite anode faces aseriousbottleneck of arelatively low theoretical capacityo fa round 372 mAh g À1 ,b ased on the formation of aL iC 6 intercalation compound. [8,9] Besides, traditional lithium-storage materials often suffer from drawbacks such as seriousc apacity loss and limited cycling ability when cycling at high rates, which could mainly be ascribed to the high polarization and poor conductiona bilitieso ft he electrode materials.…”

Recent progress in carbon-based nanoarchitectures for advanced supercapacitors

“…The as-prepared materials exhibited good capacitive properties, such as 1320 F g −1 of CNO/Ppy bilayer in 0.1 M LiClO 4 electrolyte. Presser et al [72,73] prepared OLC (Fig. 1f) via vacuum treatment of UD50 nanodiamond powder and then modified OLCs with three different types of quinones (1,4-naphthoquinone; 9,10-phenanthrenequinone; and 4,5-pyrenedione) to increase energy density.…”