Enhanced Electrochemical Performance of Biomass Porous Carbon Adsorption Congo Red

Biomass porous carbon has received widespread attention due to its application as electrode material for supercapacitors and adsorbent for difficult-to-degrade organic dyes. In this paper, biomass porous carbon KGL is prepared using ginkgo leaves as the precursor and KOH as the activator. Capitalizing on the adsorption property of porous carbon, an azo dye Congo red (CR) is confined into the nanopores of KGL to fabricate the KGL/CR electrode. The result suggests that KGL has good adsorption performance for organic dye and KGL/CR has excellent capacitance performance. When the CR concentration is 500 mg L-1, the adsorption capacity of KGL is 495 mg g-1. KGL/CR-500 displays elevated specific capacitance of 393 F g-1 at 1 A g-1 and excellent rate performance (76.3% capacitance retention at 10 A g-1). The capacitance retention after 10000 cycles maintains 99%. The symmetric supercapacitor has power density of 699.8 W kg-1 at an energy density of 16.4 Wh kg-1 and can power a light emitting diodes (LED). Our work provides the information that one is the treatment of organic dye wastewater, the other is development of electrochemical energy-storage materials, and may be expanded to the resource-utilization of other versatile effluent containing the redox groups.

Nitrogen doped graphene with diamond-like bonds achieves unprecedented energy density at high power in a symmetric sustainable supercapacitor

A nitrogen-superdoped graphene with diamond-like interlayer bonds is obtained via the radical chemistry of fluorographene, affording a symmetric supercapacitor with an energy density of 200 W h L−1 at a power of 2.6 kW L−1 and 143 W h L−1 at 52 kW L−1.

High-voltage aqueous symmetric supercapacitor based on 3D bicontinuous, highly-wrinkled, N-doped porous graphene-like ultrathin carbon sheets

In this study, a facile pyrolysis is utilized to convert mantis shrimp shell into 3D bicontinuous porous, highly wrinkled, nitrogen doped, graphene-like ultrathin carbon sheet (3D BWGC). 3D BWGC achieves...

Electrode material based on multilayer graphene oxide for chemical current sources

The results of the studies of the electrochemical synthesis of multilayer graphene oxide were presented, and the possibility of using it as an electrode material of the supercapacitor was shown. In an alcohol suspension the thickness of the particles of multilayer graphene oxide was less than 0.1 µm with an area of more than 100 µm2. The graphene oxide-based electrode has a high specific capacity of 107 F·g−1 and a high charge retention rate of 97% after 5000 cycles. It was shown that the graphene oxide electrode had a maximum specific energy of 8.7 W·h·kg−1 at the current density of 0.1 A·g−1 and had a maximum power of 2291.1 W·kg−1 at the current density of 4 A·g−1. The application of a lithium-thionyl chloride cell with a multilayer graphene oxide cathode on a nickel grid was tested. It was found that graphene oxide synthesized using the electrochemical method is a promising electrode material for creating a symmetric supercapacitor.