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Title

Strong and light cellular silicon carbonitride – Reduced graphene oxide material with enhanced electrical conductivity and capacitive response

AuthorsMoyano, Juan J.; Mosa Ruiz, Jadra ; Aparicio, Mario ; Pérez-Coll, Domingo ; Belmonte, Manuel ; Miranzo López, Pilar ; Osendi, María Isabel
KeywordsFilament printing
Graphene oxide
Preceramic polymer
Supercapacitors
Issue Date2019
PublisherElsevier
CitationAdditive Manufacturing 30 (2019)
Abstract[EN] Steady graphene oxide (GO) scaffolds created by direct ink writing are used to develop a silicon carbonitride (SiCN) -graphene oxide hybrid material through a preceramic polymer route. For achieving mechanically stable GO scaffolds, the drying method is critical as the ink contains about 5 wt.% of GO, 10 wt.% of polyelectrolytes and 85 wt.% of water. The liquid preceramic polymer (polysilazane type) quickly infiltrates the 3D scaffolds, under vacuum conditions, entirely covering the GO network creating a replica of the original scaffold. The hybrid cellular structure -once thermally treated for GO reduction and ceramic conversion- consists of a network of reduced GO (∼10 wt.%) embedded in an amorphous SiCN matrix following the designed architecture. The 3D hybrid structures show notable electrical conductivity (890 S m at room temperature), thermal stability and considerable strength, about 20 times higher than the single GO scaffold. The structures are tested as electrodes for supercapacitors, reaching a gravimetric capacitance of 39 F g that remains stable after 7000 charge/discharge cycles.
Publisher version (URL)http://dx.doi.org/10.1016/j.addma.2019.100849
URIhttp://hdl.handle.net/10261/214211
Identifiersdoi: 10.1016/j.addma.2019.100849
e-issn: 2214-8604
issn: 2214-7810
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