In this study, we demonstrated a strategy for fabricating unique
2D ternary nanohybrids comprising N-doped graphene (NG) and in-plane
WSe2–WO3 (W–W) heterojunction
nanosheets (NG/W–Ws) through heat treatment/oxidation processes
using a graphene/PANI/WSe2 precursor. PANI served as an
exfoliating and N-doping agent and played a crucial role along with
graphene in developing a high effective surface area and pore volume.
The NG/W–Ws showed a single kinetic reaction (the Volmer–Heyrovsky
step) with a single onset potential for the hydrogen evolution reaction
(HER) and decreased overpotentials; this was attributed to the intercalated
NG. Density functional theory calculations indicated that NG decreases
the energy gap between the LUMO and HOMO levels, and the differential
Gibbs free energy of atomic hydrogen on the catalyst surface was close
to zero. Therefore, the NG/W–Ws presented a linear relationship
between their electrocatalytic performance (e.g., onset potential
and overpotential) and mass loading (thickness). The total resistance
and capacitance of the NG/W–Ws decreased and increased, respectively,
with increasing electrode thickness, highlighting the synergy between
the NG and W–W components. We believe that the proposed strategy
will ensure the facile fabrication of multicomponent 2D heterostructured
nanohybrids for high mass-loading electrocatalyst systems and will
contribute to the practical commercialization of 2D nanohybrids as
electrocatalysts.
Herein, we demonstrate a facile ligand-mediated hot injection strategy for manipulating the growth of Cs 3 Cu 2 Br 5 nanocrystals to systematically control their morphology and properties. The use of ligands with different chain lengths (C6, C9, and C18) resulted in different morphologies. All of the nanocrystals exhibited large band gaps, and their optical absorption spectra depended on their morphology. Furthermore, we demonstrated that the photoluminescence of the nanocrystals can be modulated by replacing the halogen atom Br with I or Cl. The electronegativity of the halogen atom was correlated with the excitonic effect and structural deformation in the nanocrystal.
Herein, a sequential gas‐phase process involving air jet milling followed by chemical vapor deposition (CVD), is demonstrated to be an efficient strategy for the fabrication of heterolayered 2D nanohybrids (2DNHs) decorated with nanocatalysts. Tens of grams of the nanohybrids, which is a substantial quantity at the laboratory scale, are produced in the absence of solvents and water, and without the need for an extra purification procedure. Air jet milling enables the development of binary/ternary heterolayered structures consisting of graphene, WSe2, and/or MoS2 via the gas‐phase co‐exfoliation of their bulk counterparts. Based on the X‐ray photoelectron and Raman spectroscopy data, the heterolayers of the 2DNHs exert chemical and electronic effects on each other, while diminishing the interactions between same‐component layers. Moreover, the electrochemically active surface area increases by >190% and the charge transfer resistance decreases by >35%. CVD is performed to introduce Pt and Ru nanoparticles with diameters of a few nanometers as additional electrocatalysts into the 2DNHs. The nanocatalyst‐decorated 2DNHs show excellent performance for the production of hydrogen and oxygen gases in water‐splitting cells. Notably, the proposed all‐gas‐phase processes allow for the large‐scale production of functional 2DNHs with minimal negative environmental impact, which is crucial for the commercialization of nanomaterials.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.