Edge-exposed MoS₂nano-assembled structures as efficient electrocatalysts for hydrogen evolution reaction

Abstract

Edge-exposed MoS2 nano-assembled structures are designed for high hydrogen evolution reaction activity and long term stability. The number of sulfur edge sites of nano-assembled spheres and sheets is confirmed by Raman spectroscopy and EXAFS analysis. By controlling the MoS2 morphology with the formation of nano-assembled spheres with the assembly of small-size fragments of MoS2, the resulting assembled spheres have high electrocatalytic HER activity and high thermodynamic stability.

Facile Synthesis of MoS2@CNT as an Effective Catalyst for Hydrogen Production in Microbial Electrolysis Cells

“…In principle, HER may involve three steps in acid media, [21,24,28,29] with similar Tafel behavior also being observed previously in PBS solution [Eq. (1), (2), and (3)]: [30] Volmer reaction :…”

One-pot synthesis of nanosheet-assembled hierarchical MoSe2/CoSe2 microcages for the enhanced performance of electrocatalytic hydrogen evolution

“…[34][35][36][37] The 2D structure can offer both large surface area for ion adsorption and active sites on its edge. [38][39][40][41][42] Both experimental and theoretical studies have conrmed that the HER activity of electrocatalysts correlates with the number of catalytically active edge sites. [43][44][45][46][47][48][49][50][51] It has also proved that the edges of the TMD sheets play an important role in HER process.…”

Enhancement of electrochemical and catalytic properties of MoS2 through ball-milling

“…Huge effort was therefore directed to the synthesis and preparation of nanometer sized MoS 2 structure in order to increase the availability of the edge portions of the material which have been demonstrated to be the active sites. [7,8] Chemical exfoliations of the bulk material have been developed through the use of Li intercalation with the aim of achieve single or few layered structures, [9] or alternatively, a bottom-up approach was followed to directly synthesized MoS 2 nanostructures with higher density of edge sites. [8,10] Other approaches consisted of the chemical exfoliation of bulk MoS 2 with the aid of sonication and particular solvents.…”

“…[7,8] Chemical exfoliations of the bulk material have been developed through the use of Li intercalation with the aim of achieve single or few layered structures, [9] or alternatively, a bottom-up approach was followed to directly synthesized MoS 2 nanostructures with higher density of edge sites. [8,10] Other approaches consisted of the chemical exfoliation of bulk MoS 2 with the aid of sonication and particular solvents. [11,12] All of these methods require wet chemistry processing, the use of potentially dangerous chemicals and in particular the chemical exfoliation generate extremely low amount of exfoliated material.…”