1 research outputs found
Three-Dimensional Graphene Sheet-Carbon Veil Thermoelectric Composite with Microinterfaces for Energy Applications
Over
the years, various processing techniques have been explored
to synthesize three-dimensional graphene (3DG) composites with tunable
properties for advanced applications. In this work, we have demonstrated
a new procedure to join a 3D graphene sheet (3DGS) synthesized by
chemical vapor deposition (CVD) with a commercially available carbon
veil (CV) via cold rolling to create 3DGS-CV composites. Characterization
techniques such as scanning electron microscopy (SEM), Raman mapping,
X-ray diffraction (XRD), electrical resistance, tensile strength,
and Seebeck coefficient measurements were performed to understand
various properties of the 3DGS-CV composite. Extrusion of 3DGS into
the pores of CV with multiple microinterfaces between 3DGS and the
graphitic fibers of CV was observed, which was facilitated by cold
rolling. The extruded 3D graphene revealed pristine-like behavior
with no change in the shape of the Raman 2D peak and Seebeck coefficient.
Thermoelectric (TE) power generation and photothermoelectric responses
have been demonstrated with in-plane TE devices of various designs
made of p-type 3DGS and n-type CV couples yielding a Seebeck coefficient
of 32.5 μV K–1. Unlike various TE materials,
3DGS, CV, and the 3DGS-CV composite were very stable at high relative
humidity. The 3DGS-CV composite revealed a thin, flexible profile,
good moisture and thermal stability, and scalability for fabrication.
These qualities allowed it to be successfully tested for temperature
monitoring of a Li-ion battery during charging cycles and for large-area
temperature mapping