MoSe₂-Amorphous CNT Hierarchical Hybrid Core–Shell Structure for Efficient Hydrogen Evolution Reaction

Abstract

Fabrication of noble-metal-free, earth-abundant, inexpensive, and efficient electrocatalyst for hydrogen evolution reaction (HER) is a challenge for clean and sustainable energy carrier. Transition-metal dichalcogenides have shown their potential as an electrode material toward electrochemical HER activity. Herein we successfully developed hierarchical core–shell nanostructure of molybdenum diselenide (MoSe2)-amorphous carbon nanotube (aCNT) via a simple solvothermal procedure, showing excellent electrocatalytic HER activity in acidic medium. The MoSe2-aCNT exhibits onset potential as low as −64 mV and small Tafel slope of ∼49 mV/dec with an HER activity superior to that of the pristine aCNTs and MoSe2. Experimental results along with theoretical investigation demonstrate that the exposed active edges of MoSe2 nanosheet on amorphous wall of the aCNTs with a low free energy barrier promote the improvement of electrocatalytic HER activity. This work opens a new strategy for the development of advanced amorphous carbon nanostructure-based hybrid HER catalyst in acidic medium.

Resistive Switching in a MoSe2-Based Memory Device Investigated Using Conductance Noise Spectroscopy

“…Figure shows the schematic of the synthesis process. The detailed sample preparation method of MoSe 2 NFs has been discussed in our earlier study . In this process, a certain amount of sodium molybdate (Na 2 MoO 4 ·2H 2 O) was added to 22.5 mL of a dimethylformamide (DMF) solution and dispersed well by sonication for 30 min at room temperature (∼30 °C).…”

“…Thereafter, the as-prepared solution was transferred into a 100 mL autoclave up to 60% of its volume and placed in a preheated oven at 180 °C for 12 h. Next, the autoclave was allowed to cool naturally, and the obtained black residue was washed with deionized water and ethanol several times. The black residue powder was annealed at 450 °C in a N 2 atmosphere for 4 h to obtain good crystallinity of MoSe 2 NFs …”

“…The detailed sample preparation method of MoSe 2 NFs has been discussed in our earlier study. 36 In this process, a certain amount of sodium molybdate (Na 2 MoO 4 •2H 2 O) was added to 22.5 mL of a dimethylformamide (DMF) solution and dispersed well by sonication for 30 min at room temperature (∼30 °C). Next, dispersion of 15 mg of selenium powder in 7.5 mL of hydrazine hydrate was carried out by constant stirring in an oil bath at 80 °C for 60 min.…”

“…The black residue powder was annealed at 450 °C in a N 2 atmosphere for 4 h to obtain good crystallinity of MoSe 2 NFs. 36 2.2. Fabrication of RRAM Devices.…”

Phosphorus‐Doping‐Induced Optimization of Atomic Hydrogen Binding Energy in MoSe2 under High Coverage for Efficient Electrocatalytic Hydrogen Evolution Reactions

“…[9] Significant efforts have been devoted to overcoming these shortcomings. For example, MoSe 2 nanostructures grown on metal foil [10] and hierarchical MoSe 2 -amorphous carbon nanotube composites [11] have been synthesized using wet-chemical methods to expose more active sites. Furthermore, carriers with excellent conductivity have been used to improve the poor conductivity of MoSe 2 .…”