Enhancement of the supercapacitive properties of laser deposited graphene-based electrodes through carbon nanotube loading and nitrogen doping
Pérez del Pino, Ángel (Institut de Ciència de Materials de Barcelona)
Rodríguez López, Marta (Institut de Ciència de Materials de Barcelona)
Ramadan, Mohamed Ahmed (Helwan University)
García Lebière, Pablo (Institut de Ciència de Materials de Barcelona)
Logofatu, Constantin (National Institute for Materials Physics)
Martínez-Rovira, Immaculada (ALBA Laboratori de Llum de Sincrotró)
Yousef, Ibraheem (ALBA Laboratori de Llum de Sincrotró)
Gyorgy, Eniko (Institut de Ciència de Materials de Barcelona)

Date:	2019
Abstract:	Several technological routes are being investigated for improving the energy storage capability and power delivery of electrochemical capacitors. In this work, ternary hybrid electrodes composed of conducting graphene/reduced graphene oxide (rGO), which store charge mainly through electric double-layer mechanisms, covered by NiO nanostructures, for adding pseudocapacitance, were fabricated through a matrix assisted pulsed laser evaporation technique. The incorporation of multiwall carbon nanotubes (MWCNTs) provokes an increase of the porosity and thus, a substantial enhancement of the electrodes' capacitance (from 4 to 20 F cm at 10 mV s). Volumetric capacitances of 34 F cm were also obtained with electrodes containing just carbon nanotubes coated with NiO nanostructures. Moreover, the use of nitrogen containing precursors (ammonia, urea) for laser-induced N-doping of the nanocarbons also provokes a notable increase of the capacitance. Remarkably, N-containing groups in rGO-MWCNTs mainly add electric double layer charge storage, pointing to an increase of electrode porosity, whereas redox reactions contribute with a minor diffusion fraction. It was also observed that the loading of carbon nanotubes leads to an increase of diffusion-controlled charge storage mechanisms versus capacitive ones in rGO-based electrodes, the opposite effect being observed in graphene electrodes.
Grants:	Ministerio de Economía y Competitividad ENE2017-89210-C2-1-R Ministerio de Economía y Competitividad SEV-2015-0496 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1086
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Diffusion controlled ; Electric double layer ; Electrochemical capacitor ; Graphene electrodes ; Matrix assisted pulsed laser evaporation ; NiO nanostructures ; Technological route ; Volumetric capacitance
Published in:	Physical chemistry chemical physics, Vol. 21, Issue 45 (December 2019) , p. 25175-25186, ISSN 1463-9076

DOI: 10.1039/c9cp04237g
PMID: 31693021

12 p, 4.7 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > The ALBA Synchrotron
Articles > Research articles
Articles > Published articles