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Metal-Free Multilayer Graphene Electrodes Activated by PECVD for Electrochemical Oxidation Enhancement

2025-11-18Artigo científico Acesso aberto
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dc.contributor.authorBastos, Tarso Leandro
dc.contributor.authorda Silva, Camila Cristina
dc.contributor.authorNunes, Daniela
dc.contributor.authorFortunato, Elvira
dc.contributor.authorMartins, Rodrigo
dc.contributor.authorKathan, Devadharshini
dc.contributor.authorMustain, William Earl
dc.contributor.authorGelamo, Rogério Valentim
dc.contributor.authorColmati, Flavio
dc.contributor.institutionCENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N)
dc.contributor.institutionDCM - Departamento de Ciência dos Materiais
dc.contributor.institutionUNINOVA-Instituto de Desenvolvimento de Novas Tecnologias
dc.contributor.pblACS - American Chemical Society
dc.date.accessioned2026-02-03T16:28:01Z
dc.date.available2026-02-03T16:28:01Z
dc.date.issued2025-11-18
dc.descriptionPublisher Copyright: © 2025 The Authors. Published by American Chemical Society
dc.description.abstractMultilayer graphene (MLG) was obtained by 3 h ultrasonication of thermally expanded graphite in n-propanol, producing 5–13-nm-thick flakes with 1–50 μm lateral size. The powder was dry-pressed into self-supported disk electrodes (MLGD) and surface-activated by brief MW-PECVD and RF-PECVD in Ar/CO2 and Ar/O2. PECVD raised Raman ID /IG from 0.07 to 0.26–0.28 (La ≈ 275 → 69–92 nm) and gave higher localized O for CO2 MW-PECVD (≈1.05 wt % vs ≈0.13 wt % for O2). Electrochemically, areal capacitance increased ≈11.9 → ≈16.5 mF·cm–2 (∼39%), and ethanol oxidation peak currents improved up to ≈ 40% (peak up to 2.94 mA·cm–2 for O2 RF-PECVD in 1.0 M NaOH + 2.0 M EtOH), with >95% capacitance retention after 15 CV cycles. These results highlight that PECVD post-treatment provides a rapid, reagent-free, and tunable surface functionalization of compacted MLG electrodes, enabling increased capacitance and enhanced ethanol oxidation with minimal bulk structural degradation.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent19
dc.format.extent5641864
dc.identifier.doi10.1021/acsanm.5c03602
dc.identifier.issn2574-0970
dc.identifier.otherPURE: 151944160
dc.identifier.otherPURE UUID: 8a20b935-bad8-49e0-b4d1-872628498cb1
dc.identifier.otherScopus: 105023374490
dc.identifier.otherWOS: 001618347800001
dc.identifier.otherORCID: /0000-0002-4202-7047/work/204628453
dc.identifier.otherORCID: /0000-0003-3115-6588/work/204630170
dc.identifier.urihttp://hdl.handle.net/10362/199982
dc.identifier.urlhttps://www.scopus.com/pages/publications/105023374490
dc.identifier.urlhttps://www.webofscience.com/wos/woscc/full-record/WOS:001618347800001
dc.language.isoeng
dc.peerreviewedyes
dc.subjectAr/CO and Ar/O glow discharges
dc.subjectEthanol oxidation
dc.subjectPECVD
dc.subjectPlasma process
dc.subjectSurface functionalization
dc.subjectGeneral Materials Science
dc.titleMetal-Free Multilayer Graphene Electrodes Activated by PECVD for Electrochemical Oxidation Enhancementen
dc.typejournal article
degois.publication.firstPage22586
degois.publication.issue47
degois.publication.lastPage22604
degois.publication.titleACS APPLIED NANO MATERIALS
degois.publication.volume8
dspace.entity.typePublication
rcaap.rightsopenAccess

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