The impact of graphene oxide nanosheet lateral dimensions on the electrochemical performance of nanoporous graphene-based electrodes
Bernicola, María del Pilar (Institut Català de Nanociència i Nanotecnologia)
Madrid-Gimeno, Miquel (Institut Català de Nanociència i Nanotecnologia)
Murillo Cremaes, Nerea (Institut Català de Nanociència i Nanotecnologia)
Battisti, Tommaso (Institut Català de Nanociència i Nanotecnologia)
Lozano, Neus (Universitat Autònoma de Barcelona. Institut de Neurociències)
Kostarelos, Kostas (Institut Català de Nanociència i Nanotecnologia)
Garrido, Jose (Institut Català de Nanociència i Nanotecnologia)
Del Corro, Elena (Institut Català de Nanociència i Nanotecnologia)

Date:	2024
Abstract:	Electrodes based on nanoporous reduced graphene oxide (rGO) have been developed as the interfacing component in different designs of neural implants in a variety of therapeutic and monitoring applications. The starting graphene oxide (GO) nanosheets lateral dimensions influenced the staking order, roughness and thickness of the derived rGO films, including the formation of nanochannels. Apart from the morphological differences observed, the GO lateral dimension also impacted on the film conductivity, and on the overall electrochemical performance of the rGO electrodes. While electrodes fabricated from nano-scale GO sheets (us-GO) only showed diffusion-limited impedance in the high frequency regime, the electrical response of electrodes from micron-scale GO sheets (L-GO) was limited by diffusion in the whole frequency range due to a less disordered nanoporous film. At 1 kHz, us-GO electrodes, due to their larger capacitance, presented a higher charge injection limit (Qinj. l. ) than L-GO electrodes. Due to the higher conductivity of L-GO, electrodes exhibited half the ohmic drop (IR) of electrodes made of us-GO,. This work highlights the importance of GO nanosheet engineering to optimize the performance of rGO electrodes in terms of Qinj. l. and IR, two key figures of merit in neuroelectronic applications.
Grants:	European Commission 825213 European Commission 881603 European Commission 101070865 Agencia Estatal de Investigación PID2020-113663RB-I00 Ministerio de Ciencia e Innovación RYC2019-027879-I Ministerio de Ciencia, Innovación y Universidades SEV-2017-0706 Ministerio de Ciencia e Innovación CEX2021-001214-S
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, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca
Subject:	GO nanosheets ; Nanoporous graphene electrodes ; Electrochemical performance
Published in:	Diamond and Related Materials, Vol. 150 (December 2024) , art. 111722, ISSN 1879-0062

DOI: 10.1016/j.diamond.2024.111722

10 p, 6.5 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Health sciences and biosciences > Institut de Neurociències (INc)
Articles > Research articles
Articles > Published articles