The impact of laser-scribing carbon-based supercapacitor electrodes

Simple item page
dc.contributor.authorBaptista, M.
dc.contributor.authorGaspar, G.
dc.contributor.authorWijayantha, Upul K. G.
dc.contributor.authorLobato, K.
dc.date.accessioned2022-06-07T11:37:26Z
dc.date.available2022-06-07T11:37:26Z
dc.date.issued2022-06-06
dc.description.abstractIn highly porous carbon electrodes, a large fraction of pores can be inaccessible to the electrolyte, which translates into lower specific capacitances. This is accentuated at high current densities. To circumvent this, channels can be opened to enhance ionic diffusion. In this work, ionic channels were created using a pulsed laser. Nine sets of laser-scribing parameters (pulse fluence and spot spacing) were applied on two sets of carbon-based supercapacitor electrodes: K-bar hand-coated electrodes (“K”) and screen-printed electrodes (“SP”). Profilometry and scanning electron microscopy revealed that, before laser-scribing, the latter already had several holes and trenches, whilst the former were compact films. Electrochemical measurements in Na2SO4 indicate improvements in the rate capability of the laser-scribed SP electrodes, namely an up to 50% reduction of the rate at which energy density decreases as power densities increase. For laser-scribed K electrodes, the slope of the Ragone plot only decreased by ca. 20% in the best set of conditions. However, for both sets of electrodes, a negative trade-off is observed: laser processed electrodes seem to have a lower specific capacitance. This might be caused by the entrapment of debris in the laser-drilled holes, which could lead to the overestimation of the active mass. Moreover, X-ray Photoelectron Spectroscopy analysis suggests that this may also be explained by the decrease in the oxygen functionalities and by its impact on the electrodes’ wettability. On the other hand, for electrodes tested in an organic electrolyte (tetrabutylammonium perchlorate in acetonitrile), the specific capacitance at 2 A/g was up to 66% higher for laser-scribed electrodes and an energy density of 13 Wh/kg was achieved even at 2.8 kW/kg.en_UK
dc.identifier.citationBaptista M, Gaspar G, Wijayantha KGU, Lobato K. (2022) The impact of laser-scribing carbon-based supercapacitor electrodes. Applied Surface Science Advances, Volume 10, August 2022, Article number 100262en_UK
dc.identifier.issn2666-5239
dc.identifier.urihttps://doi.org/10.1016/j.apsadv.2022.100262
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/17989
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectSupercapacitoren_UK
dc.subjectIonic diffusionen_UK
dc.subjectLaser scribingen_UK
dc.subjectPerformanceen_UK
dc.titleThe impact of laser-scribing carbon-based supercapacitor electrodesen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Laser-scribing_carbon-based_supercapacitor_electrodes-2022.pdf
Size:
5.72 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SWEE)