Facile One-Step Electrodeposition Fabrication of Amorphous MoS2 Catalysts in Titanium for Hydrogen Evolution Reaction

Abstract

Hydrogen is seen as a future energy carrier that will assist the global energy fuel demand. However, it is still necessary to study efficient and inexpensive catalysts that can be used on a large scale to make this technology practical. In this paper the electrodeposition of molybdenum disulfide (MoS 2) film on titanium (Ti) substrate was performed by cyclic voltammetry and the film was evaluated for hydrogen evolution reaction (HER). The deposition optimized conditions was 25 cycles and 4 mmol L-1 (NH 4) 2 [MoS 4 ] in 0.1 mol L-1 NaClO 4 solution. The film was characterized from X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and they showed an amorphous structure and high catalytic activity for HER. The Tafel slope was 85 mV dec-1 and overpotential at −10 mA cm-2 was −139 mV showing that Ti substrate compared with fluorine-tin doped oxide (FTO) substrate favored the HER and electroactivity of MoS 2 films.

All-Electrochemically Grown Sb2Se3/a-MoSx Photocathodes for Hydrogen Production: The Effect of the MoSx Layer on the Surface Recombination and Photocorrosion of Sb2Se3 Films

“…In all cases, the analytical error was below 7% for Sb–Se elements (Figure S4 in the Supporting Information). For the MoS x layer, this ratio has no significance to the desired end since the films obtained are amorphous and nonstoichiometric MoS x as also reported in the literature . However, the (Mo + S)/(Se + Sb) ratio shows that the amount of MoS x deposited grows continuously as the number of deposition cycles increases.…”

“…For the MoS x layer, this ratio has no significance to the desired end since the films obtained are amorphous and nonstoichiometric MoS x as also reported in the literature. 15 However, the (Mo + S)/(Se + Sb) ratio shows that the amount of MoS x deposited grows continuously as the number of deposition cycles increases. Figure S5 (in the Supporting Information) shows the diffractogram of bare Sb 2 Se 3 and Sb 2 Se 3 /MoS x (15 cycles).…”

“…Tafel parameter b also reveals that the charge is transferred faster at the a-MoS x (15 cycles) film interface as it has a lower b value. 15 This is probably due to the increase in active sites on the a-MoS x surface associated with the greater number of deposition cycles.…”

“…To overcome this economic issue, MoS x ( x = 2 and 3) is an electrocatalyst consisting of low-cost, nontoxic, earth-abundant elements . Amorphous MoS x (a-MoS x ) is reported as one of the major compounds for HERs because it has a high concentration of active sites at the edges layers, which favors its electrocatalytic activity if compared with its crystalline form. , Thus, the effects of a-MoS x on Sb 2 Se 3 thin films are of great importance for the evaluation of the photoelectrocatalytic and interfacial properties of the system.…”

Towards Highly Efficient Chalcopyrite Photocathodes for Water Splitting: The Use of Cocatalysts beyond Pt

“…[44,45] The amorphous molybdenum sulfide (MoS x ) prepared at room temperature and atmospheric pressure by the electrodeposition technique exhibited remarkably high activities for HER, being more processable and scalable. [46,47] Until then used only in electrocatalytic systems, molybdenum sulfide has received attention from other areas related to hydrogen production, being incorporated into photoelectrocatalytic systems as a cocatalyst material, replacing the high-cost Pt.…”