Fabrication of graphene-based electrochemical capacitors through reactive inverse matrix assisted pulsed laser evaporation
| Autor: | Constantin Logofatu, Ibraheem Yousef, Ángel Pérez del Pino, Mohamed Ahmed Ramadan, Eniko Gyorgy, Raluca Ivan, Pablo García Lebière |
|---|---|
| Přispěvatelé: | Ministerio de Economía, Industria y Competitividad (España), Generalitat de Catalunya, Ministerio de Economía y Competitividad (España) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
MAPLE Oxide Laser deposition General Physics and Astronomy 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences law.invention chemistry.chemical_compound law Graphene electrode Reduced graphene oxide Graphene-NiO hybrid Supercapacitor Graphene Non-blocking I/O Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Ascorbic acid Evaporation (deposition) N-doping graphene 0104 chemical sciences Surfaces Coatings and Films chemistry Chemical engineering Electrode 0210 nano-technology |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 2017-8921 |
| Popis: | Electrodes constituted by nitrogen-doped reduced graphene oxide (NrGO) in combination with NiO nanostructures were fabricated by means of reactive inverse matrix assisted pulsed laser evaporation technique. The structure-composition of the electrode composites was tailored by laser-inducing chemical reactions of graphene oxide (GO) flakes with different precursor molecules (citric acid, ascorbic acid and imidazole) during GO deposition. Structural characterizations reveal the formation of wrinkles and nanoholes in the NrGO sheets, besides their coating with NiO nanostructures. Compositional studies disclose that imidazole precursor promotes the synthesis of NrGO with the largest degree of reduction and nitrogen doping (mainly with graphitic and pyridinic N). Electrochemical analyses of the obtained electrodes reveal that NiO nanostructures increase surface charge storage processes (double layer – pseudocapacitive) over diffusive ones, being the imidazole-based electrodes the ones exhibiting the best performance (up to 114 F cm−3 at 10 mV s−1). Symmetric and asymmetric electrochemical capacitors were also fabricated showing excellent robustness over 10,000 charge-discharge cycles at high specific currents. The authors thank the financial support of the Spanish Ministry of Economy, Industry and Competitiveness under the project ENE2017-89210-C2-1-R, and support from AGAUR of Generalitat de Catalunya through the project 2017 SGR 1086. ICMAB acknowledges financial support from the Spanish Ministry of Economy and Competitiveness, through the “Severo Ochoa” Programme for Centres of Excellence in R&D (SEV-2015-0496). FTIRM experiments were performed at MIRAS beamline at ALBA Synchrotron with the collaboration of ALBA staff. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|