Shape engineered three dimensional α-Fe₂ O₃ -activated carbon nano composite as enhanced electrochemical supercapacitor electrode material

Abstract

Summary In the current work, we present a green and scalable microwave mediated synthesis of shape engineered nano ironoxide supported on high surface area activated carbon (AC) derived from spent sawdust from mushroom cultivation. The derived composites were characterized using scanning electron microscopy, high‐resolution tunneling electron microscopy, powder X‐ray diffraction, Braun Emmet Teller surface area analyzer, thermo gravimetric analysis, and Raman spectroscopic techniques. The AC/ironoxide composite exhibited specific surface area of 907.51 m2/gm, showed the Fe to be in the form hematite (ά‐Fe2O3) and was thermally stable up to 700°C. The ironoxide was found to be of nano size having flower like unique morphology. The nano composite material has a specific capacitance of 898 F/g at a scan rate of 10 mV/s and retained 95% of capacitance even after 10 000 charge‐discharge cycles. The excellent stability and unique morphology makes the composite an alluring material for super capacitor applications.

Nitrogen‐doping activated biomass carbon from tea seed shell for CO 2 capture and supercapacitor

“…It showed excellent electrochemical performance and cycle stability. Gannavarapu et al 30 prepared activated carbon and α-Fe 2 O 3 was loaded. In their work, superior electrochemical performance and stability were exhibited.…”

Synthesis of porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam for battery‐supercapacitor hybrid devices

“…Currently, battery‐supercapacitor hybrid (BSH) device composed of a capacitive electrode and a battery‐type electrode was used to increase energy density . In general, the working voltage of the BSH device could be enlarged by utilizing different potential windows of two electrodes . Obviously, the electrode was considered as an important part of the high‐performance BSH device.…”

“…[10][11][12][13] In general, the working voltage of the BSH device could be enlarged by utilizing different potential windows of two electrodes. 14,15 Obviously, the electrode was considered as an important part of the high-performance BSH device. It was note that the battery-type electrodes were found to possess higher specific capacity because they store charge via the rapid reversible Faradic redox reactions.…”

Hydrogen ion supercapacitor cell construction and rational design of cell structure

“…Supercapacitors and secondary cells are regarded as promising candidates for energy storage and conversion devices. Interesting results have already been published for supercapacitors, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] lithiumion secondary batteries, [16][17][18][19][20][21] and sodium-ion secondary batteries. 22 Hybrid supercapacitors, however, merge the boundary between the supercapacitors and secondary batteries and possess several advantages over them, including high energy density, high power density, fast charge and discharge speed, and long cycle life.…”