Two-Dimensional
SnSe Nanonetworks: Growth and Evaluation
for Li-Ion Battery Applications
Posted on 2020-07-08 - 21:44
Engineered two-dimensional
(2D) layered materials possess unique
physical properties with the potential to improve the performance
and endurance of future electronic and energy devices. Here, we report
the growth of complex 2D nanonetworks of crystalline tin selenide
(SnSe) via liquid injection chemical vapor deposition using a single-source
diselenoether precursor. Potential applications of SnSe span a wide
range of technological areas, particularly in energy devices. The
synthesized SnSe networks were composed of high surface area interconnected
junctions of one-dimensional (1D) nanowires in a 2D plane; such complex
SnSe nanonetwork structures have not previously been reported. The
SnSe networks possessed an orthorhombic Pnma 62 crystal structure
throughout, with the individual network branches uniformly orientated
along the <011> and <01–1> directions. The width
of the
individual interconnected nanowire branches ranged from 120 to 250
nm with lengths ranging from 1 to 4 μm. The networks of 1D nanowires
had a layer thickness of 88 ± 10 nm. A growth mechanism for the
formation of these networks is proposed based on the minimization
of high surface energy planes. We also highlight the potential of
SnSe nanonetworks as an anode material for Li-ion batteries with galvanostatic
testing showing an initial discharge capacity in excess of 1000 mAh
g–1 with a 92% capacity retention after 50 cycles
at a specific current of 100 mA g–1.
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Davitt, Fionán; Stokes, Killian; Collins, Timothy W.; Roldan-Gutierrez, Manuel; Robinson, Fred; Geaney, Hugh; et al. (2020). Two-Dimensional
SnSe Nanonetworks: Growth and Evaluation
for Li-Ion Battery Applications. ACS Publications. Collection. https://doi.org/10.1021/acsaem.0c00776