Large-Scale Synthesis of Graphene-Like MoSe₂ Nanosheets for Efficient Hydrogen Evolution Reaction

Abstract

Two-dimensional (2D) materials have attracted great attention by researchers due to their fascinating properties and promising applications. However, the synthesis methods for few layers are usually difficult to expand to large area applications because of their low yield. In this paper, graphene-like MoSe2 nanosheets are successfully and scaleable synthesized by a facile and low-cost hydrothermal method under the synergy of PVP and graphene. The ultrathin MoSe2 nanosheets are typically 1–3 layers, which are confirmed by HRTEM. This unique structure makes this MoSe2 electrode material show superior activity toward the electrocatalytic hydrogen production with a low Tafel slope about 70 mV·dec–1. Furthermore, the synthesized graphene-like MoSe2 nanosheets had a high stability during the electrocatalytic process and we nearly cannot find the degradation after 1000 cyclic voltammetric sweeps.

Unveiling the Origin of the High Catalytic Activity of Ultrathin 1T/2H MoSe2 Nanosheets for the Hydrogen Evolution Reaction: A Combined Experimental and Theoretical Study

“…The MS-6 sample had at ypical flower-like morpholo-gy (Figure 5a), in whichas ingle MoSe 2 nanosheet was stacked into ultrathin few-layered assembliesw ith at hickness of approximately 5nm( Figure S2). [43] This was in agreement with the XRD patterns,i nw hich the peak of the (0 02)p lanes shifted to al ower degree. [43] This was in agreement with the XRD patterns,i nw hich the peak of the (0 02)p lanes shifted to al ower degree.…”

“…The HRTEM images of the crosssection at the internal area of the MS-6 assemblies (Figure 5b,c) revealed that the spacing between two adjacent monolayers was approximately 0.742 nm, which was an indication of highly expanded (0 02)p lanes of 1T-MoSe 2 . [43] This was in agreement with the XRD patterns,i nw hich the peak of the (0 02)p lanes shifted to al ower degree. Furthermore, the interplanar spacing of the MS-6 was 0.239 nm, corresponding to the (1 03)p lanes of hexagonal MoSe 2 (Figure 5c).…”

Phase Modulation of (1T‐2H)‐MoSe2/TiC‐C Shell/Core Arrays via Nitrogen Doping for Highly Efficient Hydrogen Evolution Reaction

“…To date, most of the works adopted the current density of 10 mA cm −2 as the benchmark to compare the HER performance, and there is no work on HER comparison of MoSe 2 at larger current density such as100 mA cm −2 . To realize large current HER, apart from the phase engineering, morphology engineering is indispensable . Power form is usually not suitable for large current HER due to the use of insulating binders and detach from substrate arising from bubble‐striking effect.…”

Colloidally synthesized defect-rich $$\hbox {MoSe}_{2}$$ MoSe 2 nanosheets for superior catalytic activity

“…Among the TMDs (MX 2 where M = Mo, W; X = Se, S) MoSe 2 is considered as a superior active electrocatalyst because both Mo and Se edges are active for H + binding [25]. Various groups have recently probed MoSe 2 [6], alloys of MoSe 2 with S [9], S-doped MoSe 2 [22], vertically aligned MoSe 2 [26], nanohybrid of MoSe 2 [32], ultrathin MoSe 2 NSs decorated on graphene and carbon fibre as electrocatalysts for HER [33,34]. Recently, Chen et al and Lee et al used Mo/MoSe 2 as efficient CE in DSSCs [10,11].…”