posted on 2018-08-30, 19:37authored byNoemi Dominguez, Brenda Torres, Luis A. Barrera, Julio E. Rincon, Yirong Lin, Russell R. Chianelli, Md. Ariful Ahsan, Juan C. Noveron
Our work reports the hydrothermal
synthesis of a bimetallic composite
CoMoS, followed by the addition of cellulose fibers and its subsequent
carbonization under Ar atmosphere (CoMoS@C). For comparison, CoMoS
was heat-treated under the same conditions and referred as bare-CoMoS.
X-ray diffraction analysis indicates that CoMoS@C composite matches
with the CoMoS4 phase with additional peaks corresponding
to MoO3 and CoMoO4 phases, which probably arise
from air exposure during the carbonization process. Scanning
electron microscopy images of CoMoS@C exhibit how the CoMoS material
is anchored to the surface of carbonized cellulose fibers. As anode
material, CoMoS@C shows a superior performance than bare-CoMoS. The
CoMoS@C composite presents an initial high discharge capacity of ∼1164
mA h/g and retains a high specific discharge capacity of ∼715
mA h/g after 200 cycles at a current density of 500 mA/g compared
to that of bare-CoMoS of 102 mA h/g. The high specific capacity and
good cycling stability could be attributed to the synergistic effects
of CoMoS and carbonized cellulose fibers. The use of biomass in the
anode material represents a very easy and cost-effective way to improve
the electrochemical Li-ion battery performance.