  The electro-osmotic flow (EOF) in a neutral system consisting of an aqueous
NaCl solution confined in a nanochannel with two parallel Molybdenum disulfide
($\textrm{MoS}_{\textrm{2}}$) walls and in the presence of an external electric
field parallel to the channel walls, is investigated for the first time. The
results indicate that the thickness of the Stern layer grows as the negative
electric surface charge density on the nanochannel walls increases. The Stern
layer becomes thinner as the salt concentration is increased. Moreover, the EOF
occurs under the no-slip condition on the walls. In addition, by increasing the
surface charge density the average of the flow velocity across the nanochannel
initially grows (Debye--H$\ddot{\textrm{u}}$ckel regime) and reaches its
maximum value. Then, by further increasing the surface charge density the water
flow rate decreases (intermediate regime), and gets the zero value and becomes
negative (reverse flow regime) at even larger values of the surface charge
densities. Comparing the results of the previous work wherein the channels are
composed of the black phosphorene walls with those of the present study for a
channel composed of $\textrm{MoS}_{\textrm{2}}$ surfaces, show that for the
latter case the reverse flow occurs at a lower surface charge density and with
a greater value of the peak velocity with respect to the change in the surface
charge density for the former case.
