Supercritical CO2 mediated synthesis and catalytic activity of graphene/Pd nanocomposites

Supercritical Fluid-Assisted Fabrication of Pd Nanoparticles/Graphene Using a Choline Chloride–Oxalic Acid Deep Eutectic Solvent for Enhancing the Electrochemical Oxidation of Glycerol

“…The prominent C 1s peak at 284.3 eV is contributed by C–C and the other two weak peaks 285.6 and 290.2 eV, corresponding to the C–O bond and the carboxylic group of oxalic acid, respectively. 16 There is no change in XPS data that indicates that the oxalic acid still remains on the Pd NPs/GR composites after the SCF treatment.…”

“…Pd particle growth was due to the strong interactions between the Pd particles and oxygen functional groups on the graphene sheets. 16 The size of the Pd NPs was determined to be around 12.9 ± 2.4 nm. The high-resolution (HR)-TEM image ( Figure 1 b) indicates that the Pd NP has a cubelike structure.…”

“… 24 , 25 Graphene (GR) with excellent electrical conductivity and a high surface area represents an excellent support material and, when used, it improves the electronic properties of nanomaterials through the strong interactions between the graphene and the Pd nanoparticles. 16 , 21 Therefore, Pd NPs/GR composites are potential materials for use in electrochemical sensors and as catalysts. Polyols such as ethylene glycol and glycerol have several advantages over the traditional fuels (methanol, ethanol, and formic acid) used for energy conversion in fuel cells.…”

“…Supercritical carbon dioxide (scCO 2 ) is the most commonly used solvent because it is environmentally friendly, nonflammable, chemically inert, and relatively inexpensive. Moreover, many organometallic precursors with long alkyl chains that cannot typically be utilized in supercritical water (scH 2 O) or supercritical ethanol (scEtOH) can be solubilized in scCO 2 because the scCO 2 has a similar density to the liquid carbon dioxide, which retains equal solvation power. ,− Pd nanomaterials have proven to be excellent catalysts in many reactions, including organic coupling reactions, fuel cells, hydrogen storage, and sensing. Owing to the wide range of applications of this element, many techniques for the synthesis of Pd nanostructures have been developed, including deposition using a supercritical fluid.…”

Supercritical CO2-Mediated Synthesis of CNT@Co3O4 Nanocomposite and Its Application for Energy Storage

“…After the reaction, the products can be isolated easily as a dry powder by depressurization. In previous studies, different polymers, block copolymers, and nanocomposites were prepared successfully using scCO 2 as a solvent. − …”