Synergistic Effect of MoS₂ Nanosheets and VS₂ for the Hydrogen Evolution Reaction with Enhanced Humidity-Sensing Performance

Abstract

As a typical transition-metal dichalcogenides, MoS has been a hotspot of research in many fields. In this work, the MoS nanosheets were compounded on 1T-VS nanoflowers (VS@MoS) successfully by a two-step hydrothermal method for the first time, and their hydrogen evolution properties were studied mainly. The higher charge-transfer efficiency benefiting from the metallicity of VS and the greater activity due to more exposed active edge sites of MoS improve the hydrogen evolution reaction performance of the nanocomposite electrocatalyst. Adsorption and transport of an intermediate hydrogen atom by VS also enhances the hydrogen evolution efficiency. The catalyst shows a low onset potential of 97 mV, a Tafel slope as low as 54.9 mV dec, and good stability. Combining the electric conductivity of VS with the physicochemical stability of MoS, VS@MoS also exhibits excellent humidity properties.

Ultrathin VS 2 nanodiscs for highly stable electro catalytic hydrogen evolution reaction

“…22 Theoretical studies have also shown the metallic VS 2 to display an excellent HER performance compared with other TMDCs. 29,30 From the above mentioned factors, we present a facile one-step cost-effective hydrothermal method to produce VS 2 nanodiscs (NDs), without the need of catalysts, substrates, or templates at low temperature. 25 Given the high conductivity with stable structure favoring rapid electron transport, VS 2 -based nanostructures could be a highly promising material for HER activity.…”

A Z‐Scheme Strategy that Utilizes ZnIn2S4 and Hierarchical VS2 Microflowers with Improved Charge‐Carrier Dynamics for Superior Photoelectrochemical Water Oxidation

“…Vanadium disulfide (VS 2 ) has been widely studied as an emerging electrocatalyst material for hydrogen‐evolution reactions, because of its catalytic activity both on the basal plane and at the edges . Because of its good conductivity and abundant active sites, layered VS 2 also holds great potential in the hydrogen‐evolution reaction . Very few composite materials of VS 2 (e.g., with MoS 2 and C 3 N 4 ) have been developed for superior hydrogen‐evolution activity and yet, based on the calculated energy‐level alignment of VS 2 , it is a favorable candidate to form Z‐scheme heterostructures with ZnIn 2 S 4 .…”

“…Because of its good conductivity and abundant active sites, layered VS 2 also holds great potential in the hydrogen‐evolution reaction . Very few composite materials of VS 2 (e.g., with MoS 2 and C 3 N 4 ) have been developed for superior hydrogen‐evolution activity and yet, based on the calculated energy‐level alignment of VS 2 , it is a favorable candidate to form Z‐scheme heterostructures with ZnIn 2 S 4 . Therefore, herein, we report the first synthesis of a noble‐metal‐free composite of ZnIn 2 S 4 –VS 2 , with the aim of forming a direct Z‐scheme composite material without an electron mediator.…”

Rational Design of Nanoporous MoS2/VS2 Heteroarchitecture for Ultrahigh Performance Ammonia Sensors

“…The strong (002) peak of MoS 2 /VS 2 represents the good stacking of MoS 2 as the P‐VS 2 microflowers can not only prevent the agglomeration of MoS 2 nanosheets but also create numerous contact sites for the vertical growth of MoS 2 on their surface or inner pores. It is worth noting that the diffraction peak of the MoS 2 /VS 2 heterostructure at 13.8°, corresponding to the (002) plane of MoS 2 , is lower than that of pure MoS 2 (2θ = 14.4°), suggesting the enlarged interlayer distance of the (002) plane …”

“…Compared with the surfaces of VS 2 and F127‐containing VS 2 composite, distinct meso‐/macropores can be observed on the surface of P‐VS 2 microflowers (Figure S2c–f, Supporting Information and Figure a). The pure MoS 2 nanosheets (Figure b and Figure S3a–c, Supporting Information) aggregate with each other, resulting in heterogeneous micrometer‐sized spheres since the MoS 2 nanoplates would curl freely to form a closed architecture and eventually form surface petals to reduce dangling bonds and surface energy . Figure S2c,d in the Supporting Information reveals that the original nanopetal architecture of P‐VS 2 is still maintained after the thermal carbonization, which provides a stable skeleton for the self‐assembly of MoS 2 nanosheets.…”