Amorphous CoMoS₄ Nanostructure for Photocatalytic H₂ Generation, Nitrophenol Reduction, and Methylene Blue Adsorption

Abstract

High-performance ternary transition-metal chalcogenides (TMDs) are desired in various application fields. However, developing ternary TMDs with unique performance via an efficient and economical method is still in its infancy. Herein, we developed an amorphous cobalt molybdenum sulfide (CoMoS4) nanostructure via a facile cation exchange method. XPS, SEM, and HRTEM unravel that the as-synthesized amorphous CoMoS4 nanostructures have defective structures and stacking porous configurations, which could provide abundant active sites for catalysis and adsorption behavior. As expected, such material not only can serve as a non-precious-metal cocatalyst for CdS to enhance photocatalytic H2 evolution but also can exhibit high efficiency for nitrophenol catalytic reduction, in which the apparent reaction rate constant (k app) is 5.08 × 10–2 s–1, ranking as one of the reported best non-noble-metal catalysts. Additionally, the CoMoS4 nanostructures can adsorb methylene blue (MB) very quickly, achieving adsorption equilibrium in just 90 s. More importantly, the nanostructures could be easily separated and recycled by a simple filtration method. This work enriches the research and applications of ternary transition-metal chalcogenides.

Surface Sulfur Vacancy Engineering of Metal Sulfides Promoted Desorption of Hydrogen Atoms for Enhanced Electrocatalytic Hydrogen Evolution

“…TEM imaging reveals that VCoMoS 2 is composed of typical layer-structured ultrathin nanosheets (Figure c). VCoMoS 2 displays a fractural stacking of layers with a spacing of ∼0.74 nm according to HRTEM (Figure d), which is slightly greater than that of pristine CoMoS 2 (0.67 nm) due to the introduction of SVs …”

“…VCoMoS 2 displays a fractural stacking of layers with a spacing of ∼0.74 nm according to HRTEM (Figure 4d), which is slightly greater than that of pristine CoMoS 2 (0.67 nm) due to the introduction of SVs. 40 The impact of surface SVs in CoMoS 2 toward hydrogen evolution is shown in Figure 5a. While pristine CoMoS 2 can only draw a current density of ∼5 mA•cm −2 at a bias of approximately −0.3 V vs RHE, the VCoMoS 2 electrocatalyst displays a 6-fold enhancement under the same bias.…”

Ni nanoparticles‐loaded ZnO nanowire as an efficient and stable catalyst for reduction of 4‐nitrophenol

“…The nanowire structure can also effectively prevent Ni nanoparticles from agglomeration. Compared with the crystalline counterpart, the amorphous Ni has more structural defects and low‐coordination sites, such as edges, defects, and links, which may also lead to the enhanced catalytic activity 57–60 . These features certainly affect the catalytic rate of Ni‐ZnO NWA@SSM.…”

Ultrasound assisted synthesis of highly active nanoflower-like CoMoS4 electrocatalyst for oxygen and hydrogen evolution reactions

“…They correspond to the Mo 4+ oxidation state. The peak observed at 225.5 eV is associated with the S 2 s core level, which is correlated with the Co-S bond [26] . The S 2p high-resolution XPS spectrum shown in Fig.…”