High-Performance Pt Catalyst with Graphene/Carbon Black as a Hybrid Support for SO₂ Electrocatalytic Oxidation

Abstract

In the electrochemical Bunsen reaction, which is the key reaction of the sulfur-iodide cycle, the main overpotential corresponds to the oxidation of SO 2 . The catalysts currently used for the liquid phase electrocatalytic oxidation of SO 2 are mainly based on noble metals, which have excellent corrosion resistance and catalytic activity in an acidic environment. To improve the performance of the commercial Pt catalyst, a Pt catalyst with reduced graphene oxide (RGO) and carbon black as a hybrid support was synthesized by the microwave-assisted polyol reduction process. The large two-dimensional planar structure of RGO was a better anchor for Pt nanoparticles, and a catalyst with fine and uniform distribution of Pt particles was obtained. The carbon black interior prevented the agglomeration of RGO, forming a stereoscopic catalyst structure. The electrochemical test results showed that the RGO/carbon black hybrid support catalyst possessed a higher electrocatalytic activity than the single support catalysts and could be used as an efficient and stable catalyst for the SO 2 electrolyzer.

One-Pot Facile Synthesis of Noble Metal Nanoparticles Supported on rGO with Enhanced Catalytic Performance for 4-Nitrophenol Reduction

“…Only one peak was detected (located at about 284.8 eV), which corresponds to the functional group of carbon atoms (C–C). This confirms that GO had been reduced to rGO [ 39 ]. The XPS results are in accordance with the Raman results.…”

“…Figure 3 shows that the diffraction peaks of the rGO/Au composite at 38.12°, 44.33°, 64.53°, and 77.51° correspond to the planes of face-centered cubic (FCC) gold nanoparticles (NPs) [ 36 , 37 ]. The XRD patterns of the rGO/Ag and rGO/Pt composites display four and three diffraction peaks, respectively, which confirm the formation of FCC silver NPs and FCC platinum NPs [ 38 , 39 ]. Furthermore, the intensities of the XRD diffraction peaks for the composites follow the sequence rGO/Au < rGO/Ag < rGO/Pt, which confirms that the crystalline size of Au is smaller than that of Ag and Pt.…”

Effects of Mesoporosity and Conductivity of Hierarchically Porous Carbon Supports on the Deposition of Pt Nanoparticles and Their Performance as Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media

“…Since a common strategy for improving the performance of an electrocatalyst is to increase its electronic conductivity, we have also synthesized an HPC containing graphene (referred to as HPC-GN) by adding graphene nanoplatelets during the synthesis. As previously reported, carbon composites containing graphene, graphene oxide, and carbon nanotubes exhibit higher electrocatalytic activity. − Following Pt deposition, the HPC-GN hybrid was characterized and its performance was evaluated and compared to the other systems. Altogether, this work represents a systematic study of exploring how chemical, structural, and morphological features affect the mechanism of catalyst deposition and provides further insights into the performance of these systems as electrocatalysts in alkaline membrane fuel cells.…”

Azide-Assisted Growth of Copper Nanostructures and Their Application as a Carbon Supported Catalyst in Two-Step Three-Component Azide–Alkyne Cycloadditions

“…Immobilizing catalysts on insoluble supports is a common approach to heterogenize catalysts to ease the separation of the catalyst from a reaction mixture and to recycle it. Carbon black (CB) has been employed as a support in different transition metal catalyzed reactions, − including single-atom or hybrid catalysts, ,, and various nanoparticle (NP)-based catalysts. − ,,, Several methods for the preparation of carbon supported Cu species have been reported, which include direct deposition of Cu NPs on carbon paper, electrodeposition, dip-coating carbon support in solutions of polymer supported Cu NPs, spin-coating, electrochemical reduction of a Cu 2 O layer, and reduction of Cu salts followed by pyrolysis , or calcination, both generating single atom catalysts. , A number of Cu NPs as heterogeneous CuAAC catalysts were further deposited on activated carbon ,,,− and graphene . Small Cu NPs for CuAAC have been also supported on Al nanofibers, and Cu clusters have been stabilized in solution by tetralkylammonium and cobaltocenium salts .…”