Enhancement of 1T‐MoS₂ Superambient Temperature Stability and Hydrogen Evolution Performance by Intercalating a Phenanthroline Monolayer

Abstract

Metastable modification of MoS2 (1T) is widely recognized as a hopeful non‐precious electrocatalyst in hydrogen production. This paper describes an approach to impart a superambient temperature stability to 1T‐MoS2 by incorporating it in 2D hybrid architecture with cationic monomolecular phenanthrolinium (PhenH+) hydrate layers. The atomic structure and bonding interactions of the assembled architecture revealed by PXRD, TEM, XPS, Raman and UV‐Vis spectroscopy data coupled with DFT calculations and quantum theory of atoms in molecules (QTAIM) analysis suggest that the 1T‐MoS2 sheets are involved in strong bonding with the PhenH‐H2O layers. This results in a highly stable layered system, which is kept intact in 0.5 M sulfuric acid electrolyte and tolerates superambient temperature heating. As compared with pure 1T‐MoS2, the compound with a phenanthroline interlayer provides greater activity and better current‐voltage efficiency in electrocatalytic hydrogen evolution after heating treatment owing to stabilization of the 1T phase. The obtained results could be useful for the design of novel electrocatalytic devices exploiting 1T‐MoS2 modification.

Structural Significance of Hydrophobic and Hydrogen Bonding Interaction for Nanoscale Hybridization of Antiseptic Miramistin Molecules with Molybdenum Disulfide Monolayers

“…The Mo 3d spectra of LCs were fitted with four 3d 3/2 –3d 5/2 spin-orbit doublets ( Figure 4 c and Figure S1c ). The Mo 3d 5/2 peaks located at ~228.3, 229.1, 222.3 and 230.4 eV are identified as 1T-MoS 2 modification (octahedral Mo polyhedron), 2H-MoS 2 (trigonal prismatic polyhedron), and impurity MoS x O y and MoO z states that is in accordance with previous studies [ 4 , 5 , 32 ]. The S 2p spectra fitted with four S 2p 3/2 –S 2p 1/2 doublets are shown in Figure 4 d and Figure S1d along with indication of the assigned components.…”

“…Molybdenum disulfide is a famous 2D van der Waals solid, which is considered as one of the most promising post-graphene materials owing to its outstanding properties. These properties are highly demanded for various applications such as advanced field effect transistors [ 1 , 2 ], electrocatalysts [ 3 , 4 , 5 ], biosensors [ 6 ] and energy storage materials [ 7 , 8 ]. Yet another application of MoS 2 has attracted tremendous attention during the last few years, which is based on its excellent photothermal activity.…”

“…During recent years, a number of MoS 2 layered compounds with organic species have been prepared by the soft chemical exfoliation-restacking method [ 4 , 11 ], hydrothermal synthesis [ 5 , 12 ] or surface functionalization [ 13 , 14 ]. Structural modeling and density functional theory (DFT) calculations performed for some such systems have evidenced a strong noncovalent bonding between the MoS 2 sheets and organic molecules as, for example, alkyl(aryl)amines [ 11 , 12 ], phenanthroline [ 4 ], phthalocyanine [ 15 ] and guanidine derivatives [ 16 ]. However, the structural and bonding peculiarities of the MoS 2 associates with drug molecules remain underexplored with some rare exceptions, such as the recently studied layered compound of MoS 2 with protein kinase inhibitor imatinib [ 17 ].…”

Low loading of Pt in radiation-synthesized Pt-MoSx/KB nanocomposites for enhancing the electrocatalytic hydrogen evolution reaction

“…The PXRD pattern of MoS x /KB-IX reveals a broad peak at 10°in the 2q position, which is attributed to the presence of MoS x loaded onto the KB substrate. 36 Notably, no characteristic peaks of (NH 4 ) 2 MoS 4 are present in any of the products, indicating the absence of reactant residues aer the radiation synthesis of Pt-MoS x /KB-III. Additionally, the diffraction peaks at 39.7°and 46.3°, corresponding to the 111 and 200 planes of the face-centered cubic (fcc) structure of Pt, are observed in the PXRD pattern of Pt-MoS x /KB-III.…”

Mechanistic insights of molecular metal polyselenides for catalytic hydrogen generation

“…The best performing HER catalyst is platinum, however its high cost and low natural abundance makes the development of noble-metal free catalysts an important area of research. 1 A variety of transition metal chalcogenides (ME x ) (M = Co, Fe, Ni, V, Nb, Ta, Mo, W; E = S, Se, Te) have been explored [2][3][4][5][6][7][8][9] in a quest for discovery of low production cost catalysts with high catalytic activity, and stability under aqueous corrosive conditions. Despite the extensive research conducted in this area, even the well explored chalcogenide, MoS 2 [9][10][11] significantly underperforms as electrocatalyst for HER compared to Pt.…”