This research aims to synthesize MoS2 thin film for the hydrogen evolution reaction (HER) by the electrochemical way. We investigated various electrochemical conditions, including the pH of electrolyte, the applied current density, and electrolysis time to find optimal synthesis mode. The obtained samples were characterized by scanning electron microscopy (SEM) images and X-ray diffraction (XRD) patterns to determine the morphology and crystal structure. The polarization curve confirmed the HER activity of MoS2 thin film. The results indicated that the synthesized MoS2 film had a perfect catalytic activity, as shown by the overpotential value at 10 mA/cm2 and Tafel slope reached 144 mV and 56.2 mV/dec, respectively.

Photoelectrochemical water splitting is of great attention due to its environmentally friendly generation of clean fuels. Hematite (α-Fe2O3) is considered a promising candidate due to its intrinsic properties for the high-performance photoelectrochemical electrode, such as favorable bandgap (2.0–2.2 eV), a suitable energy band position non-toxicity, low cost, and excellent chemical stability. Herein, we report about Sn-doped hematite nanorods and their implementation as photoanodes for photoelectrochemical water splitting. We provide the simple but efficient route to incorporate the Sn into the hematite without structural damage in the nanostructure and scrutinize the effect of Sn dopant on the photoelectrochemical activity of the hematite. Sn can be successfully incorporated into the hematite by the two-step heat treatment process, which reveals the enhanced photoelectrochemical responses compared with undoped hematite.  We elaborate on the effect of Sn dopant in the hematite on the photoelectrochemical activities, thereby suggesting the optimum concentration of Sn dopant.