Metal-Free Multilayer Graphene Electrodes Activated by PECVD for Electrochemical Oxidation Enhancement
Source abstract
Abstract
High Resolution Image Download MS PowerPoint Slide Multilayer 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/CO 2 and Ar/O 2 . PECVD raised Raman I D / I G from 0.07 to 0.26–0.28 ( L a ≈ 275 → 69–92 nm) and gave higher localized O for CO 2 MW-PECVD (≈1.05 wt % vs ≈0.13 wt % for O 2 ). 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 O 2 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.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Supercapacitor Materials and Fabrication · Graphene research and applications · Electrocatalysts for Energy Conversion
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institute of Chemistry
Federal University of Goiás
CENIMAT|i3N, Department of Materials Science, School of Science and Technology
NOVA University Lisbon and CEMOP/UNINOVA
Center of Excellence in Hydrogen and Sustainable Energy Technologies (CEHTES)
Institute of Technological and Exact Sciences
Federal University of Triângulo Mineiro
Department of Chemical Engineering
University of South Carolina
Funding
Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais · Funda??o de Amparo ? Pesquisa do Estado de Goi?s · Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico · Instituto de Ci?ncia e Tecnologia de Nanomateriais de Carbono · NextGenerationEU · Funda??o para a Ci?ncia e a Tecnologia · Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior · Rep?blica Portuguesa · Nacional de Grafite Ltda
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