Recent trends in MXene/Metal chalcogenides for electro-/photocatalytic hydrogen evolution reactions

2D Transition Metal Dichalcogenides‐Based Electrocatalysts for Hydrogen Evolution Reaction

“…Numerous parameters are important, such as atomic level thickness plane, high surface area, edge effects, topological effects, short ion diffusion distance, alleviated restacking, efficient charge transfer, and abundant active sites, which could be a diverse advantage in favor of HER. [40,42,[154][155][156][157]43,44,46,47,89,90,152,153] Bulk 2D based materials can be straightforwardly exfoliated into atomically thin layer sheet, including single and/or double layer, owing to the presence of weak van der Waals force between the layers, which can be easily separated with minimum efforts depending on their different physicochemical properties such as density, conductivity, corrosion resistance, melting point, and chemical stability. [12,40,154,155,157,[42][43][44]47,87,89,90,152] In case of transition metal based chalcogen materials, the transition metal atoms and chalcogen atoms would be exposed in their top position of the materials where electrolyte can access the active surface easily.…”

“…d) Schematic view of the exfoliated MoS 2 via ultrasonication for catalyzing HER. e) Schematic diagram of TMDs and f) polarization curves and Tafel plots of TMDs, respectively (Reproduced with permission [157]. Copyright 2016, American Chemical Society), g) scheme of the synthesis of TMDs, h) Tafel plots of TMDs i) polarization curves of TMDs (Reproduced with permission [158].…”

Recent development and challenges in fuel cells and water electrolyzer reactions: an overview

“…Thus, doping and the 2D design of the catalyst increase the light adsorption at low photon ux density and help to trap the electrons in the ultrathin layers. 118 Compared to single metal, recently, double metal-based MXenes have found extensive interest. Geng et al 119 designed a catalyst and with the help of DFT studies found that Cr 2 -TiC 2 S 2 , Cr 2 ViC 2 S 2 , and Mo 2 TiC 2 S 2 are active catalyst, while the low Gibbs free energy makes the materials promising candidates toward the H 2 evolution reaction.…”

“…Thus, doping and the 2D design of the catalyst increase the light adsorption at low photon flux density and help to trap the electrons in the ultrathin layers. 118 …”

Bifunctional CuS/Cl-terminated greener MXene electrocatalyst for efficient hydrogen production by water splitting

“…28,29 Recently a review on the transition metal chalcogenides shows that metal sulfides alone did not show much good results, but when these materials are deposited on 2D nanosheets like MXenes or graphene electrochemical activities improved in a greater extend because both the surface area and conductivity increases. 30 Among the most striking transition-metal chalcogenides, copper sulfide (CuS) is extensively studied as a secondary material in electrochemical sensors, 31 Li-ion batteries, 32,33 and solar cells applications 34,35 due to its metal-like conductivity, inexpensive and plentiful qualities. Recently, 36 the composite of CuS nanomaterial with two-dimensional (2D) nano MXene (HF acid-based) was investigated for supercapacitor applications.…”