Electron Transfer to Decorated Graphene Oxide Particles

Abstract

Graphene oxides (GOs) are popular catalyst supports for precious metals in nanoparticle form. The hydrogen oxidation reaction (HOR) and the hydrogen evolution reaction (HER) on individual GO platelets decorated with Pd nanoparticles (Pd/GOs) were investigated. The results suggest that the catalytic activity is confined to the zone physically close to the point of electrical contact between platelet and electrode with just afraction of the platelet active.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Single-Entity “Nano-Catalysis”: Carbon Nanotubes and the VO2+/VO2+Redox Reaction

“…CNTs are widely adopted electrocatalysts due to their high surface area and conductivity . In particular, we make comparisons between measurements at nominally flat glassy carbon (GC) electrodes, with the same electrodes modified with b-MWCNTs and with “single” nanotubes using, for the latter, the approach of “nano-impacts” in which a micro-electrode is immersed in an electrolyte containing freely suspended nanoparticles including nanotubes. , By virtue of Brownian motion, the freely suspended nanoparticles collide with the micro-electrode undergoing a redox reaction or charge transfer or catalyzing a reaction . The reaction is monitored by the electrode current transients typically measured at a fixed potential.…”

“…30,31 By virtue of Brownian motion, the freely suspended nanoparticles collide with the micro-electrode undergoing a redox reaction or 32 charge transfer 33 or catalyzing a reaction. 34 The reaction is monitored by the electrode current transients typically measured at a fixed potential.…”

Electrochemical Sensing at a Confined Space

“…Another immobilization method is sticking a ready-formed NP on the electrode surface. A more convenient sticking approach was developed to analyze the electrochemical properties of Pd-decorated carbon nanotube and Pd-decorated graphene oxide (GO x ). , During the single NP collision process, the interaction between carbon materials and the UME surface made carbon materials stay at the UME surface for a period of time, which enabled the characterization of voltammetry. Therefore, the electron transfer kinetics of a single Pd-decorated carbon nanotube or GO x were acquired.…”

Stochastic Collision Electrochemistry from Single G-Quadruplex/Hemin: Electrochemical Amplification and MicroRNA Sensing

“…13,14 Compton and co-workers illustrated the electrochemical and electrocatalytic properties of single nanoparticles through the stochastic impact. 3,15 Oja et al and Robinson et al reported the multipeak collision behavior of silver nanoparticle oxidation on ultramicroelectrodes. 11,16 Since the first insight reported by Bard,17 single-enzyme electrochemistry through the stochastic collision electrochemistry method has triggered researchers' interest in investigating the electrocatalytic/electrochemical activity of single enzyme/molecules.…”

“…The single molecule/particle analysis has attracted great attention in the past two decades because it not only can provide the fundamental process of electron-transfer reactions but also reveal the intrinsic properties masked in ensemble-averaged measurements. − Different techniques, including fluorescence, Raman spectroscopy, electrochemistry, , and image technique, were developed to detect single molecules/particles but some limitations (e.g., special equipment, complicated treatments, or poor selectivity) always existed. Stochastic collision electrochemistry, developed by Xiao and Bard and Quinn et al , have received increasing interest because it can provide the electrochemical process at the single nanoparticle/molecule level through the collision on ultramicroelectrode surfaces. , For example, Dick et al and Gao et al observed the single-protein/DNA molecule collision based on the blockage of the faradic current of the redox process on microelectrodes. , Compton and co-workers illustrated the electrochemical and electrocatalytic properties of single nanoparticles through the stochastic impact. , Oja et al and Robinson et al reported the multipeak collision behavior of silver nanoparticle oxidation on ultramicroelectrodes. , …”