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López-Sánchez J, Peña Á, Serrano A, Del Campo A, Rodríguez de la Fuente Ó, Carmona N, Matatagui D, Horrillo MDC, Rubio-Zuazo J, Navarro E, Marín P. Generation of Defective Few-Layered Graphene Mesostructures by High-Energy Ball Milling and Their Combination with FeSiCuNbB Microwires for Reinforcing Microwave Absorbing Properties. ACS APPLIED MATERIALS & INTERFACES 2023; 15:3507-3521. [PMID: 36606586 DOI: 10.1021/acsami.2c19886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Defective few-layered graphene mesostructures (DFLGMs) are produced from graphite flakes by high-energy milling processes. We obtain an accurate control of the generated mesostructures, as well as of the amount and classification of the structural defects formed, providing a functional material for microwave absorption purposes. Working under far-field conditions, competitive values of minimum reflection loss coefficient (RLmin) = -21.76 dB and EAB = 4.77 dB are achieved when DFLGMs are immersed in paints at a low volume fraction (1.95%). One step forward is developed by combining them with the excellent absorption behavior that offers amorphous Fe73.5Si13.5B9Cu1Nb microwires (MWs), varying their filling contents, which are below 3%. We obtain a RLmin improvement of 47% (-53.08 dB) and an EAB enhancement of 137% (4 dB) compared to those obtained by MW-based paints. Furthermore, a fmin tunability is demonstrated, maintaining similar RLmin and EAB values, irrespective of an ideal matching thickness. In this scenario, the Maxwell-Garnet standard model is valid, and dielectric losses mainly come from multiple reflections, interfacial and dielectric polarizations, which greatly boost the microwave attenuation of MWs. The present concept can remarkably enhance not only the MW attenuation but can also apply to other microwave absorption architectures of technological interest by adding low quantities of DFLGMs.
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Affiliation(s)
- Jesús López-Sánchez
- Instituto de Magnetismo Aplicado (IMA), Universidad Complutense de Madrid-Administrador de Infraestructuras Ferroviarias (UCM─ADIF), 28230Las Rozas, Spain
- Departamento de Electrocerámica, Instituto de Cerámica y Vidrio─Consejo Superior de Investigaciones Científicas (ICV─CSIC), 28049Madrid, Spain
| | - Álvaro Peña
- Instituto de Magnetismo Aplicado (IMA), Universidad Complutense de Madrid-Administrador de Infraestructuras Ferroviarias (UCM─ADIF), 28230Las Rozas, Spain
- Departamento de Física de Materiales, Universidad Complutense de Madrid (UCM), 28040Madrid, Spain
| | - Aída Serrano
- Departamento de Electrocerámica, Instituto de Cerámica y Vidrio─Consejo Superior de Investigaciones Científicas (ICV─CSIC), 28049Madrid, Spain
| | - Adolfo Del Campo
- Departamento de Electrocerámica, Instituto de Cerámica y Vidrio─Consejo Superior de Investigaciones Científicas (ICV─CSIC), 28049Madrid, Spain
| | - Óscar Rodríguez de la Fuente
- Instituto de Magnetismo Aplicado (IMA), Universidad Complutense de Madrid-Administrador de Infraestructuras Ferroviarias (UCM─ADIF), 28230Las Rozas, Spain
- Departamento de Física de Materiales, Universidad Complutense de Madrid (UCM), 28040Madrid, Spain
| | - Noemí Carmona
- Instituto de Magnetismo Aplicado (IMA), Universidad Complutense de Madrid-Administrador de Infraestructuras Ferroviarias (UCM─ADIF), 28230Las Rozas, Spain
- Departamento de Física de Materiales, Universidad Complutense de Madrid (UCM), 28040Madrid, Spain
| | - Daniel Matatagui
- Instituto de Magnetismo Aplicado (IMA), Universidad Complutense de Madrid-Administrador de Infraestructuras Ferroviarias (UCM─ADIF), 28230Las Rozas, Spain
- Departamento de Física de Materiales, Universidad Complutense de Madrid (UCM), 28040Madrid, Spain
- SENSAVAN, Instituto de Tecnologías Físicas y de la Información─Consejo Superior de Investigaciones Científicas (ITEFI─CSIC), 28006Madrid, Spain
| | - María Del Carmen Horrillo
- SENSAVAN, Instituto de Tecnologías Físicas y de la Información─Consejo Superior de Investigaciones Científicas (ITEFI─CSIC), 28006Madrid, Spain
| | - Juan Rubio-Zuazo
- Spanish CRG BM25-SpLine at The ESRF─The European Synchrotron, 38000Grenoble, France
- Instituto de Ciencia de Materiales de Madrid─Consejo Superior de Investigaciones Científicas (ICMM─CSIC), 28049Madrid, Spain
| | - Elena Navarro
- Instituto de Magnetismo Aplicado (IMA), Universidad Complutense de Madrid-Administrador de Infraestructuras Ferroviarias (UCM─ADIF), 28230Las Rozas, Spain
- Departamento de Física de Materiales, Universidad Complutense de Madrid (UCM), 28040Madrid, Spain
| | - Pilar Marín
- Instituto de Magnetismo Aplicado (IMA), Universidad Complutense de Madrid-Administrador de Infraestructuras Ferroviarias (UCM─ADIF), 28230Las Rozas, Spain
- Departamento de Física de Materiales, Universidad Complutense de Madrid (UCM), 28040Madrid, Spain
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Carbon-α-Fe2O3 Composite Active Material for High-Capacity Electrodes with High Mass Loading and Flat Current Collector for Quasi-Symmetric Supercapacitors. ELECTROCHEM 2022. [DOI: 10.3390/electrochem3030032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In this work, we report the synthesis of an active material for supercapacitors (SCs), namely α-Fe2O3/carbon composite (C-Fe2O3) made of elongated nanoparticles linearly connected into a worm-like morphology, by means of electrospinning followed by a calcination/carbonization process. The resulting active material powder can be directly processed in the form of slurry to produce SC electrodes with mass loadings higher than 1 mg cm−2 on practical flat current collectors, avoiding the need for bulky porous substrate, as often reported in the literature. In aqueous electrolyte (6 M KOH), the so-produced C-Fe2O3 electrodes display capacity as high as ~140 mAh g−1 at a scan rate of 2 mV s−1, while showing an optimal rate capability (capacity of 32.4 mAh g−1 at a scan rate of 400 mV s−1). Thanks to their poor catalytic activity towards water splitting reactions, the electrode can operate in a wide potential range (−1.6 V–0.3 V vs. Hg/HgO), enabling the realization of performant quasi-symmetric SCs based on electrodes with the same chemical composition (but different active material mass loadings), achieving energy density approaching 10 Wh kg−1 in aqueous electrolytes.
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