PbS nanocrystals decorated Reduced Graphene Oxide for NIR responsive capacitive cathodes
| Autor: | Chiara Ingrosso, Nicoletta Depalo, Angela Agostiano, V. Valenzano, Elisabetta Fanizza, Marinella Striccoli, Roberto Comparelli, Ilaria Palchetti, Valentina Pifferi, Giuseppe Valerio Bianco, M. L. Curri, A. Testolin, Michela Corricelli, Luigi Falciola |
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| Rok vydání: | 2021 |
| Předmět: |
Nanocomposite
Materials science Graphene Interface and colloid science Oxide chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Nanocrystal Chemical engineering chemistry law Electrode General Materials Science 0210 nano-technology Indium |
| Zdroj: | Carbon. 182:57-69 |
| ISSN: | 0008-6223 |
| Popis: | Novel hybrid nanocomposites formed of 1-Pyrene Carboxylic Acid (PCA) functionalized Reduced Graphene Oxide (RGO) sheets, surface decorated with UV–Vis–NIR light-harvester PbS nanocrystals (NCs), are prepared by means of an in situ colloidal chemistry approach, using oleic acid (OLEA) as a surfactant. PCA molecules anchored onto the RGO sheets feature carboxyl groups that serve as coordinating sites for the PbS NCs heteronucleation. Here, the mechanism underlying the NCs decoration of RGO is investigated and the interplay between the concentration of PCA and OLEA and the Pb precursor:OLEA molar ratio are demonstrated able to careful control NCs morphology and size distribution, governing also RGO covering density. Remarkably, PCA-RGO/PbS NCs modified Indium Thin Oxide (ITO) electrodes show an electrochemical specific capacitance much higher than that characterizing the single components of the nanocomposite, that can be further enhanced under illumination in the NIR. The nanocomposite modified electrodes demonstrate to behave as (photo)electrochemical supercapacitors, chemically stable, able to work both as (photo)charging and blocking electrodes, exhibiting a photocathodic behavior. The investigation of the NIR-light enhanced photocapacitive characteristics of the hybrid (photo)cathodes provides useful insights on their future integration in devices, including electrochemical photocapacitors and photoelectrochemical (bio)sensors. |
| Databáze: | OpenAIRE |
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