Fabrication of an Ag2S-MoSx/MoNiAg film electrode for efficient electrocatalytic hydrogen evolution in alkaline solution

Catalysts for the hydrogen evolution reaction in alkaline medium: Configuring a cooperative mechanism at the Ag-Ag2S-MoS2 interface

“…The right balance between the two components (Ag2S and MoS2) is essential, to avoid situations where the Ag(I) content is too low to overcome the transition energy barrier for water dissociation, or when the surface of the hybrid is enriched with Ag(I) but with only a few surrounding MoS2 sites such that the M-Hadd formation is hindered. In addition, retaining a certain fraction of the original metallic core will be advantageous in increasing the conductivity, since both Ag2S and MoS2 are semiconductors [61,62]. Recent studies also demonstrated that introducing a second active component for water dissociation to a substrate with near-optimal M-Hads energetics can greatly improve the alkaline HER kinetics (such as Ni(OH)2 decorated by Pt co-catalysts [12]).…”

Ag sputtering–assisted phase formation of Ag2S‐decorated ZnS composite sheets and their photoactive performances

“…Similarly, in the work of Gultom et al., the composite powder target consisted of MoS 2 and Ag is externally pressed at 350°C for 30 min under an Ar atmospheric condition to form a solid sputtering target. The XRD analysis results demonstrate that two compounds of MoS 2 and Ag 2 S coexist in the as‐synthesized target 28 . Notably, the Ag 2 S film can be produced in a static environment with the sputtering Ag experienced the sulfurization reaction carried out in a vacuum tube using sulfur powder at 250°C 29 .…”

“…The XRD analysis results demonstrate that two compounds of MoS 2 and Ag 2 S coexist in the as-synthesized target. 28 Notably, the Ag 2 S film can be produced in a static environment with the sputtering Ag experienced the sulfurization reaction carried out in a vacuum tube using sulfur powder at 250 • C. 29 Another work shows the thermal evaporation-derived Ag thin film was vulcanized by the chemical sulfurization method at sulfurization temperature of 350 • C, and subsequent post-annealing temperature of 250 • C can successfully result in the formation of Ag 2 S film. 30 It was proposed by Dias et al that the reaction temperature of 350 • C is sufficiently high to allow Ag being converted into Ag 2 S in the S precursor.…”

Bimetallic Cobalt–Nickel Electrode Made by a Sputtering Technique for Electrocatalytic Hydrogen Evolution Reaction: Effect of Nickel Ratios

“…With a spin-energy separation of 17.8 eV, the Ni 2+ 2p 3/2 and Ni 2+ 2p 1/2 peaks can be seen at 855.36 and 873.24 eV, respectively . The concentration of Co 2+ and Ni 2+ is much higher than that of the Co 0 and Ni 0 peaks and can be explained by surface oxidation, where some metal atoms on the surface get oxidized and bond with adsorbed oxygen, which can be sensitively detected with the XPS tool …”