All‐Gas‐Phase Synthesis of Heterolayered Two‐Dimensional Nanohybrids Decorated with Metallic Nanocatalysts for Water Splitting

Abstract

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.

Two‐Step Sequential Process for Fabricating Graphene Nanosheets Decorated with Copper Halide Nanocrystals and Their Optoelectronic Applications

“…Another mechanism in which the Cu ion in CuI reacts with the graphene model would be possible. Depending on where the copper bonds with the oxygen atoms in the graphene model, different energy values are calculated for three different structures (2)(3)(4). Importantly, the candidate structures 2-4 exhibit lower energy values than their separated counterparts.…”

“…202300217 properties in the nanometer regime may allow for the creation of nanohybrids with properties distinct from those of their constituents. [3] Furthermore, in the process of creating nanohybrids, the usual synthetic variables as well as additional material variables can be considered, [4,5] which open up possibilities for exploring a broader range of new scientific phenomena. Diverse nanoscale materials with specific functionalities, such as exceptional electrical and optical properties, [6][7][8] have been designed or discovered for both academic research and industrial applications.…”

Physically Exfoliating 2D Materials: A Versatile Combination of Different Materials into a Layered Structure

“…As described in Section 3.3, metallic nanocatalysts can be incorporated into 2D nanohybrids to improve their electrocatalytic performance. As presented in Figure , Pt- and Ru-decorated 2D nanohybrids were demonstrated for high-performance electrocatalysis in water splitting (the individual components were given their initial letters as names) . First, the HER and OER activities were evaluated for the Pt-and Ru-decorated 2DNHs using linear sweep voltammetry (LSV) curves in a three-electrode cell containing 1 M KOH electrolyte (Figure a–d).…”

Controlled Growth of Perovskite Nanocrystals on Nanotubes via a Nanoseeding Intermediate Stage: Toward Novel Optoelectronic Applications

“…In recent years, there has been a growing interest in using nanoscale materials for various applications and in enhancing their long-term stability. − These materials can be anchored and stabilized using a support, which can induce synergistic effects. − The use of nanocarbon species such as carbon nanotubes and graphene as functional supports has been widely studied, and they offer advantages such as a high specific surface area, high structural/chemical stability, and high thermal/electrical conductivity. − These features can be exploited to fine-tune the formation and properties of nanoscale materials on the support and such fine-tuning can facilitate the development of stable and high-performance nanohybrids for a wide range of applications. , …”

“…9−13 These features can be exploited to fine-tune the formation and properties of nanoscale materials on the support and such fine-tuning can facilitate the development of stable and high-performance nanohybrids for a wide range of applications. 14,15 An inorganic perovskite CsPbBr 3 has recently gained attention owing to its exceptional optical and electronic properties. 16,17 It has excellent photoluminescence (PL) and light absorption characteristics, which render it a promising candidate for a variety of applications in the fields of optics, optoelectronics, catalysis, and imaging.…”