3.2 SEM and TEM analysis
The morphology and microstructure of MCS, NiSe2 and
MCNS-10 samples were investigated by SEM and high-resolution TEM. As
shown in Fig. 2a , the prepared MCS
solid
solutions were irregular particles and agglomeration agglomeration,
which was consistent with the morphologies reported in previous
literature [33]. In Fig.
2b , the NiSe2 was
obviously observed to be greater irregular crystals than that MCS, some
of them were cubic crystal structures consistent with XRD
pattern. The TEM image
(Fig. 2c ) showed some MCS nanoparticles were anchored on the
surface of cubic NiSe2. Compared with pure MCS, the
dispersion of MCS has been greatly improved in the composite catalyst,
this intimate interface contact was conductive to separation and
transfer of electron-hole pairs. HRTEM image in Fig. 2d shown
the lattice fringes of the MCNS-10, the crystal plane spacing of 0.357
nm (red mark) and 0.298 nm (blue
mark) were respectively corresponded to the (100) plane of hexagonal MCS
and (200) plane of cubic
NiSe2. Fig. 2e shown the EDX spectrum of the
MCNS-10 which demonstrated the existence of Mn, Cd, S, Ni and Se
elements, so the successful preparation of
MCNS-10 may be proved. Further, the
Cu element in the spectrum was mainly derived from the Cu carriers
[34].