PHOTOCATALYTIC WATER SPLITTING USING THE SEMICONDUCTOR HETEROJUNCTION BETWEEN MoO_3-X/CDS

It is essential to diversity energy sources for ensuring sustainability. While hydrogen is considered a promising energy storage medium, its potential hinges on the development of efficient photocatalysts for green production. In addressing this challenge, we evaluated the performance of a heterojunction system composed of non-stoichiometric molybdenum oxides (MoO_3−x) and cadmium sulfide (CdS) quantum dots (QDs) for water splitting. MoO_3−x were synthesized via gamma irradiation of the MoO₃ in the presence of formic acid (FA), while CdS-MPA QDs were electrosynthesized. The heterojunction was formed through adsorption. The structural and electronic characterization revealed a progressive transformation from MoO₃ to MoO_3−x and MoO_3−x/CdS-MPA QDs, demonstrating enhanced water-splitting performance. Upon evaluation, the study revealed a charge transfer mechanism, highlighting the significance of relative band positions between MoO_3−x and CdS-MPA QDs in promoting eco-friendly hydrogen evolution and methanol processing. Thus, we suggest that the synergism between MoO_3−x and CdS-MPA QDs semiconductors makes the heterojunction system a promising solution for photocatalytic production of hydrogen and oxygen.

Keywords:
hydrogen; photocatalysis; MoO_3−x, CdS quantum dots