Growth of Ag2S-sensitizer on MoS2/ZnO nanocable arrays for improved solar driven photoelectrochemical water splitting
Rem Yann, Sreymean Ngok, Elfatih Mustafa, Xianjie Liu, M. Willander, Chan Oeurn Chey, Omer Nur
Abstract
The demonstration of an efficient nanostructure that provides acceptable photoelectrochemical water splitting properties using the sun visible radiation is an appealing issue. In this connection, a new ternary nanocomposite of Ag2S/MoS2/ZnO photoanode is subsequently fabricated via hydrothermal, solvothermal and SILAR methods. Different characteristics including XRD, SEM, EDX, XPS, UV–Vis-IR spectroscopy and electrochemical techniques, were used to characterize the grown composites. The post-grown annealed 8-Ag2S/MoS2/ZnO photoanode exhibits a good performance with a photocurrent density of 2 mA/cm2 at a bias potential 1.23 V vs. RHE. The photocurrent of the post-grown annealed 8-Ag2S/MoS2/ZnO photoanode is 71.42 times, 40 times and 2 times higher compares to the pure ZnO, post-grown annealed MoS2/ZnO, and post-grown annealed 8-Ag2S/ZnO photoanodes, respectively. The enhanced PEC performance may originate from the combination of different effects such as the expansion of light absorption and energy band alignment (n-n type II heterostructures), [SO4] acted as a charge-transfer medium, and electrode-electrolyte interface kinetic reactions.