Ni3Se4@MoSe2 Composites for Hydrogen Evolution Reaction

Abstract

Transition metal dichalcogenides (TMDs) have been considered as one of the most promising electrocatalysts for the hydrogen evolution reaction (HER). Many studies have demonstrated the feasibility of significant HER performance improvement of TMDs by constructing composite materials with Ni-based compounds. In this work, we prepared Ni3Se4@MoSe2 composites as electrocatalysts for the HER by growing in situ MoSe2 on the surface of Ni3Se4 nanosheets. Electrochemical measurements revealed that Ni3Se4@MoSe2 nanohybrids are highly active and durable during the HER process, which exhibits a low onset overpotential (145 mV) and Tafel slope (65 mV/dec), resulting in enhanced HER performance compared to pristine MoSe2 nanosheets. The enhanced HER catalytic activity is ascribed to the high surface area of Ni3Se4 nanosheets, which can both efficiently prevent the agglomeration issue of MoSe2 nanosheets and create more catalytic edge sites, hence accelerate electron transfer between MoSe2 and the working electrode in the HER. This approach provides an effective pathway for catalytic enhancement of MoSe2 electrocatalysts and can be applied for other TMD electrocatalysts.

Direct electrodeposition of Ni‐Co‐S on carbon paper as an efficient cathode for anion exchange membrane water electrolysers

“…The compositional ratio of Ni, Co, and S measured by the XPS (Table S4) was different from those by EDS (Figure S9 and Table S3) owing to the different analytic depths of the two instruments. As indicated in Figure 6B, the Ni 2p 3/2 spectrum of the Ni‐Co/CP electrode was divided into an Ni 0 peak at 852.3 eV, Ni 2+ peak at 855.7 eV, and Ni satellite peak at 861.4 eV 64‐68 . Conversely, for the Ni‐Co‐S/CP electrode, the Ni 0 peak vanished and the Ni 2+ peak shifted 0.3 eV to a higher binding energy, demonstrating the oxidized electronic structure of the Ni, compared with the Ni‐Co/CP case.…”

“…As indicated in Figure 6B, the Ni 2p 3/2 spectrum of the Ni-Co/CP electrode was divided into an Ni 0 peak at 852.3 eV, Ni 2+ peak at 855.7 eV, and Ni satellite peak at 861.4 eV. [64][65][66][67][68] Conversely, for the Ni-Co-S/CP electrode, the Ni 0 peak vanished and the Ni 2+ peak shifted 0.3 eV to a higher binding energy, demonstrating the oxidized electronic structure of the Ni, compared with the Ni-Co/CP case. Similar behavior was also observed in the Co 2p 3/2 spectra for the Ni-Co/CP and Ni-Co-S/CP electrodes ( Figure 6C).…”

Recent Progress and Prospective of Nickel Selenide-Based Electrocatalysts for Water Splitting

“…In addition to synergistic metal doping on Ni x Se y -based electrocatalysts, the construction of the heterostructure on nickel selenide could also optimize the surface/interface electronic structure and facilitate intrinsic catalytic activity and electrical conductivity. − Wang et al constructed NiSe 2 –Ni 2 P coupling heterostructures on NF, which confirmed that the heterojunction formation can significantly improve the water splitting activity of host material NiSe 2 , and DFT calculations were carried out to understand the influence of the heterogeneous interface on the significantly enhanced catalytic performance (Figure a-f) . Zhang et al prepared the three-dimensional substrate electrode CoSe 2 @NiSe 2 material for the first time, which maximizes the synergistic effect between CoSe 2 and NiSe 2 .…”

Lattice Mismatch in Ni3Se4–MoSe2 Nanoheterostructures with an Abundant Interface for Catalytic Hydrogen Evolution

“…However, conventional strategies have been reported to construct the interfaces between MoSe 2 and nickel selenide in synthetic routes. One is to use one-step hydrothermal synthesis, which makes metal ions and selenium ions combine freely in solution. , The other is to synthesize MoSe 2 first and adopt the epitaxial growth method of nickel selenide in MoSe 2 surfaces. − The two synthetic routes make the phase distribution uneven and the interface less. However, the more interfaces exposed to the catalyst, the larger and wider the lattice strain is.…”