Conferência: Molecular Precursor Derived Ceramics and Layered Composites for Energy Storage Devices

Possibilidade de intercambio para alunos de Pós-Graduação

Molecular Precursor Derived Ceramics and Layered Composites for Energy Storage Devices

Data: 08 /06/2017 – (quinta-feira) Horário: 16 horas
Local: Sala 1 – DQ/UFSCar

Dr. Gurpreet Singh

Associate Professor, Mechanical and Nuclear Engineering department, Kansas State University, Manhattan, KS, USA

Observação: Possibilidade de intercambio para alunos de Pós-Graduação

Resumo: Precursor-derived ceramics are high temperature glasses derived from pyrolysis of organosilicon polymers. Silicon carbonitride (Si-C-N) and Silicon oxycarbide (Si-O-C) are the two most commonly studied systems in this class. Hallmark of these materials is their unique three-phase amorphous structure that consists of nanometer size domains of SiC, Si3N4 (or SiO2) and the disordered carbon phase. Studies have shown that such domains only exist in ceramics prepared via the polymer pyrolysis route. Furthermore, the size and distribution of the carbon phase in the ceramic may be manipulated by modifications to the molecular structure of the pre-ceramic polymer and pyrolysis conditions that allows control over the optical, electrical, electrochemical, and thermal properties of the ceramic. Additional tuning in ceramic properties is possible by elemental doping and/ or chemical interfacing of pre-ceramic polymer with nano-fillers. Focus of this talk will be on our recent efforts to interface 2-D materials (graphene, transition metal dichalcogenides) with precursor- derived ceramics to produce layered composite structures. We show that these hybrids are best suited as flexible and bendable electrodes for extreme power density/long cycle/high cycling efficiency rechargeable batteries and supercapacitors.

Daniela Caceta
Sobre Daniela Caceta 67 Artigos
Atua no Centro de Desenvolvimento de Materiais Funcionais.