  High electronic transport and reasonable chemical stability of molybdenum
disulfide (MoS$_2$) make it very suitable for electrochemical applications.
However, its energy storage capacity is still low compared with other
nanostructures. In this work, pristine and thermally oxidized MoS$_2$
(O@MoS$_2$) based hybrids are introduced by a simple method with enhanced
capacitive performance thanks to the contribution of synergistic effects.
Scanning electron microscopy (SEM), Transmission electron microscopy (TEM),
X-ray diffraction (XRD), elemental mapping, UV-Visible, and Raman analyses are
employed to investigate the morphological and crystalline structure of the
introduced hybrids. In detail, the highest gravimetric capacitance of ~205.1
Fg-1 is achieved for the MoS$_2$:O@MoS$_2$ hybrid with a mass ratio of 2:1
compared to pristine and other electrodes. This electrode is also accompanied
by the longest discharging time and excellent cyclic stability of ~%113 after
2000 continuous charge-discharge cycles. In addition, photoelectrochemical
testing of the introduced electrode leads to a ~63% increase in carrier
photogeneration compared to MoS$_2$ due to the effective charge separation
within the hybrid, which makes it suitable for water splitting and hydrogen
production applications.
