A facile approach to produce holey graphene and its application in supercapacitors

Calcium Chloride Activation of Mung Bean: A Low‐Cost, Green Route to N‐Doped Porous Carbon for Supercapacitors

“…Therefore, electrode material is the prominent factor impacting the performance of supercapacitors. In the last decade, efforts have been devoted to developing the carbon‐based electrode materials, such as carbon black, carbon nanotubes, grapheme and activated carbon, due to their large surface area, low cost, high chemical stability, and specific conductivities. However, characteristics like low energy density, complicating microporous structures and disordered texture of carbon materials will significantly prolong diffusion distance and increase ion‐transfer resistance, for which their development and application as supercapacitors are hindered.…”

Nitrogen‐Doped Holey Graphene as an Anode for Lithium‐Ion Batteries with High Volumetric Energy Density and Long Cycle Life

“…The restacking or agglomeration of the graphene sheets severely decreases their accessible surface area and thereby impede ion transport, leading to a low energy density and poor rate capability . Recently, electrodes based on graphene with a large amount of holes in its planar sheet, i.e., holey graphene (hG), have been demonstrated to deliver a high energy (gravimetric/volumetric) density and high rate capability in LIBs or supercapacitors . The presence of holes in the graphene basal plane could be beneficial to keep the hG nanosheets in the stacks remaining exfoliated.…”

Printing nanostructured carbon for energy storage and conversion applications

“…This avoids the need for surfactants or functional groups, which increase contact resistance, as in the printed CNT electrodes. Additionally, by printing porous graphene [201,202], it may be possible to significantly increase the surface area and capacitance of printed SCs. Catalyst layers (CL) are either applied to the gas diffusion layer, to produce a gas diffusion electrode (GDE), or applied to the membrane, to make a catalyst coated membrane (CCM).…”