Active Pore-Edge Engineering of Single-Layer Niobium Diselenide Porous Nanosheets Electrode for Hydrogen Evolution

Abstract

Two-dimensional transition-metal dichalcogenides (TMDs) possess interesting catalytic properties for the electrochemical-assisted hydrogen-evolution reaction (HER). We used niobium diselenide (NbSe2) as a representative TMD, and prepared single-layer NbSe2 porous nanosheets (PNS) by a double-sonication liquid-phase exfoliation, with H2O2 as a pore-forming agent. The single-layer NbSe2 PNS were drop-cast on carbon foam (CF) to fabricate a three-dimensional robust NbSe2 PNS/CF electrode. The NbSe2 PNS/CF electrode exhibits a high current density of −50 mA cm−2 with an overpotential of 148 mV and a Tafel slope of 75.8 eV dec−1 for the HER process. Little deactivation is detected in continuous CV testing up to 20,000 cycles, which suggests that this novel NbSe2 PNS/CF is a promising catalytic electrode in the HER application. The porous structure of single-layer NbSe2 nanosheets can enhance the electrochemical performance compared with that of pore-free NbSe2 nanosheets. These findings illustrate that the single-layer NbSe2 PNS is a potential electrocatalytic material for HER. More importantly, the electrochemical performance of the NbSe2 PNS/CF expands the use of two-dimensional TMDs in electrocatalysis-related fields.

Freestanding Foils of NbSe2 and Carbon Nanotubes for Efficient Electromagnetic Shielding

“…Two pairs of peaks corresponding to Nb IV from NbSe 2 and Nb V from surface oxidation were identified in both samples. In both cases, the peak positions are in good agreement with previous reports in the literature. , The degree of oxidation summarized in Table S2 shows a somewhat similar degree of oxidation in both samples with 38.9 at. % for NbSe 2 and 30.2 at.…”

Nominal Effect of Mg Intercalation on the Superconducting Properties of 2H–NbSe2

“…The core level Se 3d spectra of pure and Mg intercalated 2H–NbSe 2 are shown in Figure b,d. The Se 3d spectra of 2H–NbSe 2 is fitted to three peaks, out of which peaks at 54.06 and 53.2 eV are assigned to 3d 5/2 , while the peak at 55.1 eV is assigned to 3d 3/2 . It may be noted that the Se 3d 5/2 peak position gradually shifted to a higher binding energy value with an increase in Mg intercalation [Figure b,d].…”

“…The Se 3d spectra of 2H−NbSe 2 is fitted to three peaks, out of which peaks at 54.06 and 53.2 eV are assigned to 3d 5/2 , while the peak at 55.1 eV is assigned to 3d 3/2 . 38 It may be noted that the Se 3d 5/2 peak position gradually shifted to a higher binding energy value with an increase in Mg intercalation [Figure 2b,d]. The increase in binding energy of Se 3d with Mg intercalation either suggests the oxidation of selenium or smaller charge separation resulting in an increase in the covalent bonding character.…”

Density Functional Theory Study of Adsorption of Dissolved Gas in Transformer Oil on a Metal (Ag, Pd, and Pt)-Doped NbSe2 Monolayer

“…The sensor based on SnSe 2 thin-film modified by Au is a high-performance contender for improved ammonia-sensing capability, according to theoretical calculations and experimental findings . Due to the strong intermolecular contact between niobium diselenide molecules and the weak van der Waals force between the layers, it has metal conductivity and strong shear, lubrication, and friction capabilities, − but niobium diselenide (NbSe 2 ) micro-nanomaterials is rarely used for niobium diselenide. The sensitivity performance of gas sensors is studied.…”