In Situ Engineering MoS₂ NDs/VS₂ Lamellar Heterostructure for Enhanced Electrocatalytic Hydrogen Evolution

Abstract

Layered transition-metal dichalcogenides (TMDs) have provided new opportunities for developing inexpensive and earthabundant catalysts for electrochemical hydrogen evolution reaction (HER). As the typical family members, semiconducting MoS 2 has been widely researched for HER electrocatalysis, while it has been rarely investigated for the emerging metallic VS 2 , despite high interest and great potential in this area. Herein, by using ultrasmall monolayer MoS 2 nanodots as size-controlled precursor, a lamellar heterostructure of MoS 2 nanodots and metallic VS 2 nanosheets (MoS 2 NDs/VS 2 ) is in situ hydrothermally integrated. Via tuning the hybridizing level of MoS 2 nanodots, the morphological and structural evolution of the product is explored, and the electrocatalytic HER performances are researched. The optimized hybrid is featured with thinner lamellar heterostructure, upgraded electrical conductivity, increased catalytically active sites and improved intrinsic activity, thus exhibiting significantly enhanced performance for HER electrocatalysis in acidic media. The possible synergistic interaction between the two counterparts is elucidated preliminarily. This work may pave the way for further investigations on TMDs-based heterostructure containing metallic VS 2 nanosheets, which shows great potential in broadening the horizon of electrocatalysis and materials chemistry.

Bio-templated formation of defect-abundant VS2 as a bifunctional material toward high-performance hydrogen evolution reactions and lithium−sulfur batteries

“…Tafel slopes between the bio-templated VS 2 in this work and reported various TMDs, showing comparable and even superior performance to other documented catalysts [18,28,30,[33][34][35][36][37][38][39] . Electrochemical impedance spectroscopic (EIS) tests were carried out to unravel the charge transfer resistance at the electrode/electrolyte interface, which is a crucial parameter that reflects the HER kinetics.…”

Emerging Layered Metallic Vanadium Disulfide for Rechargeable Metal‐Ion Batteries: Progress and Opportunities

“…In 2011, an ammonia-assisted strategy based on hydrothermal synthesis was successfully employed in the preparation of ultrathin VS 2 NSs (Figure 2), [43] which led the way to the actual hydrothermals ynthesis of nanostructured VS 2 . [60,84] In later studies, flowerlike, leaflike, and layer-by-layer-like VS 2 NSs with differentt hicknesses, as well as VS 2 quantum dots (Figure 3), were directly synthesized through ah ydrothermal method with Na 3 VO 4 •12 H 2 O/Na 3 VO 4 [43,48,49,52,54,60,62,70,71,82,[84][85][86][87][88][89][90][91] or NH 4 VO 3 [37,40,42,58,59,73,76,86,[92][93][94][95][96][97][98][99] as the Vs ource and thioacetamide (TAA) or N-acetyl-l-cysteine as the Ss ource (reductant). Meanwhile,V S 2 /graphene, [42,100] Na 2 Ti 2 O 5 /VS 2 , [101] VS 2 /carbon paper, [51] TiO 2 -B@VS 2 , [102] rGO/VS 2 [44,…”

“…Since the first reported discoveryo fb ulk VS 2 in 1970, its synthesis hass uffered from numerous practical difficulties, leading to al ong-term absence of practical investigations into VS 2 , such as the need for precise controlo ver the partial pressure of S, the existence of variousn onstoichiometric phases of vanadium sulfides caused by the polytropicv alences of Vand S, and the oxophilic characterV(the form of vanadate existing in solution). [57,[69][70][71] The recent development of somef acile and novel synthetic technologies, combined with growingi nterest in metallic VS 2 ,h as motivated many emerging synthetic strategies to VS 2 -based nanostructures. The leading technologies for producing VS 2 -based nanostructures are calcination, hydrothermal, solvothermal, and CVD methods (Table 1).…”

“…In 2011, an ammonia‐assisted strategy based on hydrothermal synthesis was successfully employed in the preparation of ultrathin VS 2 NSs (Figure ), which led the way to the actual hydrothermal synthesis of nanostructured VS 2 . In later studies, flowerlike, leaflike, and layer‐by‐layer‐like VS 2 NSs with different thicknesses, as well as VS 2 quantum dots (Figure ), were directly synthesized through a hydrothermal method with Na 3 VO 4 ⋅ 12 H 2 O/Na 3 VO 4 or NH 4 VO 3 as the V source and thioacetamide (TAA) or N ‐acetyl‐ l ‐cysteine as the S source (reductant). Meanwhile, VS 2 /graphene, Na 2 Ti 2 O 5 /VS 2 , VS 2 /carbon paper, TiO 2 ‐B@VS 2 , rGO/VS 2 (Figure ), VOOH/VS 2 , VS 2 /MWCNTs, GNS/VS 2 , VS 2 ‐decorated graphitic carbon nitride (g‐C 3 N 4 ), VS 2 /CNT, Ni 3 S 2 /VS 2 , VS 2 /SS (Figure ), and NiCo 2 S 4 @VS 2 nanocomposites were also prepared through pure, cetyltrimethylammonium bromide (CTAB)‐assisted, or NaOH‐assisted hydrothermal reaction.…”

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

“…In another work a lamellar heterostructure of MoS 2 nanodots and metallic VS 2 nanosheets (MoS 2 NDs/VS 2 ) were grown by the in situ hydrothermal technique to check their electrochemical activity. The optimized composition was formed with thinner lamellar heterostructures with increased electrical conductivity; better catalytically active sites and improved basic activity were observed, thus exhibiting a good performance for HER …”