In‐Situ Electrodeposition of Rhodium nanoparticles Anchored on Reduced Graphene Oxide nanosheets as an Efficient Oxygen Reduction Electrocatalyst

Abstract

A simple, versatile, and cost‐effective one‐pot electrochemical deposition is used to fabricate rhodium (Rh) nanoparticles decorated surface of reduced graphene oxide (rGO) functionalized glassy carbon electrode (GCE) for oxygen reduction reaction (ORR) in alkaline media. The chemical and physical structure of the sample is probed via transmission electron microscopy, rotating disk electrode (RDE), X‐ray photoelectron spectroscopy, linear sweep voltammetry, and Raman spectroscopy. The synergistic effects between the unique properties of Rh nanoparticles and rGO creates such innovative hybrid that exhibits a catalytic activity comparable to that of the commercial platinum electrocatalyst (Pt/C). As a result, the as‐electrodeposited Rh@rGO hybrid exhibits outstanding ORR activity in alkaline media, as evidenced by a larger diffusion‐limited current, greater positive onset potential, much better stability and methanol tolerance than Pt/C under the same conditions.

Reduced Graphene Oxide/Copper Nanoparticle Composites as Electrochemical Sensor Materials for Nitrate Detection

“…The wide-scan XPS survey spectrum of the Cu-rGO-2 composite confirms the existence of a C 1s peak of carbon atoms at 284.5 eV, an O 1s peak of oxygen atoms at 531.5 eV, and a Cu 2p peak of copper atoms at 932.7 eV (Figure 3a). 15,17 Notably, the C/O atomic ratio of the Cu-rGO-2 composite (1.41) was much higher than that of pure GO (0.69), which indicated successful electrochemical reduction of GO. Based on Shirley algorithms, deconvolution of the C 1s spectra of Cu-rGO-2 was observed as a high-intensity peak centered at 284.7 eV, which was assigned to the C−C epoxide group of rGO (Figure 3b).…”

“…Based on Shirley algorithms, deconvolution of the C 1s spectra of Cu-rGO-2 was observed as a high-intensity peak centered at 284.7 eV, which was assigned to the C−C epoxide group of rGO (Figure 3b). 15 The three deconvoluted peaks of rGO centered at 285.9, 286.8, and 288.8 eV are attributed to the C−O hydroxyl group, CO, and O−CO carbonyl bond, respectively. 13 Figure 3c depicts the O 1s spectrum of the Cu-rGO-2 composite.…”

“…Reduced graphene oxide (rGO), a two-dimensional (2D) nanosheet with sp 2 hybridized networks of carbon atoms, has recently emerged as an attractive material that possesses extraordinary physical and chemical properties, including excellent thermal and electrical conductivities, high chemical stability, rapid charge carrier mobility, and high surface area . Decoration with Cu nanostructures on the surface of rGO nanosheets in the Cu-rGO composite leads to an improvement in the catalytic activity of the composite toward NO 3 – reduction because of the enhancement of the composite’s conductivity and specific surface area after the incorporation of rGO.…”

Electrocatalysts by Electrodeposition: Recent Advances, Synthesis Methods, and Applications in Energy Conversion

“…Sookhakian et al synthesized a nonprecious metal Rh@rGO-modified GCE by in situ electrochemical deposition for ORR. [67] Their study revealed that the ORR's high activity and stability were because of the well-homogenous decoration of the Rh nanoparticles and a 2D structure of rGO.…”

Molybdenum Disulfide Nanosheets Decorated with Platinum Nanoparticle as a High Active Electrocatalyst in Hydrogen Evolution Reaction

“…Therefore, control of Pt size and avoiding its agglomeration are favourable strategies to enance its electrocatalytic activity [ 15 ]. Consequently, it is very effective to deposit Pt nanoparticles with high homogeneity on the supporting materials such as conductive polymers, carbon, metal oxide, and sulfide[ 16 ] The supporting materials typically provide accessibility and stabilization platforms for nanoparticle growth and bring about modified reactivity and additional adsorption and active sites [ 17 ] Therefore, the decoration of Pt nanostructures such as nanostructure on supporting materials not only enhances the physiochemical properties of supporting materials but also prevents agglomeration of Pt, which influences the activity of composite towards HER [ 18 – 21 ]. Newly, earth plentiful source, high efficiency, and affordable transition metal dichalcogenides (TMDs) are considered good alternatives for HER.…”