Graphene has attracted intensive interests from broad areas of chemistry, physics, and materials science, among others. Interest in graphene's thermoelectric (TE) applications has engendered a large pile of publications and a speeding-up pace of research, making review of such research timely. This is a review covering the TE properties and their optimization strategies of graphene and graphene-based hybrids, as well as their utilizations in TE and other functional devices.
We report a new electrodeposition method for chitosan based on the coordination of chitosan to metal ions in situ-generated by simultaneous electrochemical oxidation.
Very
recently, a novel layered oxyselenide Bi2O2Se
has attracted much attention as a promising n-type eco-friendly thermoelectric
material, especially for the n-type counterpart of p-type BiCuSeO.
However, very poor electrical conductivity of intrinsic polycrystalline
Bi2O2Se prohibits the further development of
its thermoelectric performance. In the present work, a novel and facile
method using a kitchen blender was developed for large-scale production
of Bi2O2Se nanosheets. The electrical transport
behavior of the resultant bulk Bi2O2Se via shear
exfoliation changes from semiconductivity to metallic, electrical
conductivity, which is greatly improved by more than 3 orders of magnitude
from 0.1 to 470 S cm–1 at room temperature. Besides,
thermal conductivity had been reduced to 0.93 W K–1 m–1 at 773 K. This synergistical promotion of
electron–phonon transport could mainly come from increased
interfacial defects of shear-exfoliated Bi2O2Se to introduce a large amount of electrons by Se vacancies and induce
the intensive scattering of phonons by vacancies and interfaces. A
high ZT
peak of 0.5 at 793 K had been achieved
for Bi2O2Se with shear exfoliation for 60 min,
which is 1.5 times larger than the ZT record of Bi2O2Se-based thermoelectrics. In addition, the figure
of merit for the thermoelectric module based on p-type BiCuSeO and
n-type Bi2O2Se has been evaluated to be around
0.8 at 793 K, making BiCuSeO–Bi2O2Se
module a very promising candidate for mid-temperature thermoelectric
applications.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.