Graphene Oxide/Fe₂O₃ Nanocomposite as an Efficient Catalyst for Thermal Decomposition of Ammonium Perchlorate via the Vacuum-Freeze-Drying Method

Abstract

The combination of graphene oxide (GO) and iron oxide (Fe 2 O 3 ) may induce property enforcement and application extension. Herein, GO/Fe 2 O 3 nanocomposites were synthesized via the vacuum-freeze-drying method and used for the thermal decomposition of ammonium perchlorate (AP). A series of characterization techniques were applied to elucidate the asobtained nanomaterial's physicochemical properties. These results show that the treated GO is consistent with the pristine GO after the freeze-drying treatment. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analyses show that iron oxide nanoparticles are anchored on and between the GO sheets. The catalytical effect investigation on AP with different Fe 2 O 3 : GO ratios indicates that the high-temperature decomposition temperature of AP could be decreased by a temperature as high as 77 °C compared to pure AP accompanied by 3 wt % GO/Fe 2 O 3 nanocomposite which proves the high catalytic performance of the nanocomposites. The first-principles calculation was employed to elaborate the synergistic effect, and the findings demonstrate that the presence of graphene in the catalyst can enhance the catalytic effect via reducing the activation energy barrier by ∼17% in the reaction of AP thermal decomposition.

Imparting α-Borophene with High Work Function by Fluorine Adsorption: A First-Principles Investigation

“…Since the breakthrough of graphene, two-dimensional (2D) materials, including 2D monoelemental and nonmonoelemental materials, have received considerable attention and become one of the most popular research topics because of qualitative changes in their physical and chemical properties due to quantum size effect over the past decade. − As a typical member of two-dimensional monoelemental materials (Xenes), borophene has attracted significant attention over the last 10 years owing to its remarkable properties and wide range of applications. − Borophene comprises a series of boron sheets owing to its highly polymorphic nature, e.g., pure hexagonal (δ 3 -type), triangular (δ 6 -type), mixed triangular, and hexagonal (α, β, χ, and other δ-type) 2D superlattice structures, which is not observed in other Xenes. , Because of complex B–B nc-2e multicenter bonds and diverse structural polymorphs, these experimentally available borophenes exhibit numerous prominent and interesting features including in-plane anisotropic optical property; high optical transparency; high surface liveness; phonon-mediated superconductivity; exceptional electronic, semiconducting/metallic, photoacoustic, photothermal, and thermal transport properties; superior mechanical behavior; and outstanding supercapacity. − Therefore, borophene materials show promising applications in photovoltaics, display technologies, supercapacitors, metal-ion batteries, hydrogen storage, catalysis, biosensor applications, and so on. − …”

Effects of Modification Degrees on the Colloidal Stability of Amphiphilic Janus Graphene Oxide in Aqueous Solution with and without Electrolytes

“…Graphene oxide (GO) has attracted widespread attention in the past few years due to its unique physicochemical properties and the consequent possible applications in a wide range of fields. − The abundant oxygen-containing groups, including carboxyl, hydroxyl, epoxy, and carbonyl, on the surface of GO endow it with great hydrophilicity to disperse well in water. − Meanwhile, these oxygen-containing groups also endow it with high reactivity to be chemically modified. − Chemical modification of GO could greatly enhance the target properties for specific purposes, such as catalytic performance, solubility in a less polar solvent, binding ability with other materials, and amphiphilicity regulation . In most of the cases, however, modification would inevitably affect the colloidal stability of the modified GO, which might affect its performance.…”

“…8−10 Meanwhile, these oxygen-containing groups also endow it with high reactivity to be chemically modified. 11−14 Chemical modification of GO could greatly enhance the target properties for specific purposes, such as catalytic 15 performance, solubility in a less polar solvent, binding ability with other materials, 16 and amphiphilicity regulation. 12 In most of the cases, however, modification would inevitably affect the colloidal stability of the modified GO, which might affect its performance.…”

Sol–Gel Synthesis and Photocatalytic Activity of Graphene Oxide/ZnFe2O4-Based Composite Photocatalysts

“…However, due to the lack of carriers for charge carrier transfer and separation among the three, the transfer and separation efficiency of the charge carrier is low. Graphene oxide (GO) is a common carrier of charge carrier transfer and transport and is often used to enhance the charge transfer and separation efficiency of semiconductor materials (Hosseini et al, 2019;Rahmani et al, 2020;Pei et al, 2021). Therefore, the development of GO/ZO/FO/ZFO composite photocatalysts and the study of their degradation of dyes, POPS, and antibiotics are expected to show high photocatalytic activity.…”