Tunable Decoration of Reduced Graphene Oxide with Au Nanoparticles for the Oxygen Reduction Reaction

Abstract

Reduced graphene oxide (rGO) fi lms are decorated with non-overlapping Au nanoparticles using diblock copolymer micelles that provide controllability over the number density as well as the diameter of the nanoparticles. This synthetic process produces a pure Au surface without extra layers. Further more, the rGO fi lm enables the transferability of the Au nanoparticles without deterioration of their arrays. Thus, the controllability of the Au nanoparticles and their transferability with rGO fi lms allow the effective modifi cation of electrochemical electrodes. With a glassy carbon electrode modifi ed with an rGO fi lm with Au nanoparticles, high electrochemical activity is observed in the oxygen reduction reaction (ORR). Furthermore, it is possible to identify a size-dependent ORR mechanism, showing that Au nanoparticles with an average diameter of 8.6 nm exhibit a 4-electron direct reduction of O 2 to H 2 O.

Single pot electrochemical synthesis of functionalized and phosphorus doped graphene nanosheets for supercapacitor applications

“…It can be seen from the Fig. 8b the redox peak currents are proportional to the square root of scan rate which confirms the diffusion controlled electron transfer process as confirmed from the Randles-Sevcik relation [42][43][44].…”

Non‐Pt Nanostructured Catalysts for Oxygen Reduction Reaction: Synthesis, Catalytic Activity and its Key Factors

“…Non-platinum monometallic catalysts such as Pd, [26][27][28][29][30] Au, [31][32][33][34][35][36][37][38] Ag, [39][40][41][42][43][44][45] Ni, [ 46 ] with or without support, are capable of catalyzing oxygen reduction reaction. As a result of the full-fi lling state of d-bands, some metals like Au and Ag were not taken into account before due to their inert ORR activity in their bulk form; however, these metallic catalysts show remarkably improved properties when their particles attain nanosized level since electronic structure and proportion of surface atoms are…”

Layer by layer electroless deposition: An efficient route for preparing adhesion-enhanced metallic coatings on plastic surfaces

“…Layer-by-layer (LbL) assembly has drawn growing scientific interest over the past two decades as a versatile technique to deposit functional coatings one layer at a time [1][2][3] to provide for nanoscale control of the internal structure and imparting desirable macroscopic properties is important for various applications in sensors [4], biocompatible coatings [5], superhydrophobic coatings [6], gas barrier [7], flame retardancy [8] and decorative coatings [9]. Currently, there are three important strategies used for deposition of metal layers onto different substrates: dipping [10], spraying [11] and spinning [12].…”

“…Moreover, dipping of the substrates from one solution to another introduces the cross-contamination of electrolytes, though dipping process can conduct with rinsing to reduce contamination but the time required for rinsing presents a limitation to the process. Another drawback associated with dipping is the limited dimensions of substrates and it is difficult to be integrated in an auto manufacturing line for large surfaces [9].…”