Redox Electrochemistry of Mn(II) via Carbon Black Nanoparticle Impacts

Abstract

The field of impact electrochemistry, namely, electrochemical processes occurring at nanoparticles during collisions with a substrate electrode, has recently been applied to the recovery of commercially important metals. In this study, the reduction and oxidation of solution Mn(II) were observed on carbon black particles during nanoimpacts, with the onset potentials of the reduction and oxidation processes in good agreement with solution voltammetry. The formation of Mn(0) and MnO 2 was confirmed via scanning electron microscopy/ energy-dispersive X-ray (SEM/EDX) analysis and X-ray photoelectron spectroscopy (XPS) analysis. Coverages of between 0.2 and 0.6 monolayer equivalents were obtained for the reductive deposition of Mn, whereas for the anodic deposition of MnO 2 , a more complex picture was found due to the oxidation pathway from Mn(II) to MnO 2 .

Polishing Mechanism of CMP 4H-SiC Crystal Substrate (0001) Si Surface Based on an Alumina (Al2O3) Abrasive

“…Figure 6b shows the Mn 2p core-level spectrum with two peaks located at 654.4 eV and 642.6 eV. This corresponds to the spin doublet of Mn 2p 1/2 and Mn 2p 3/2 with a separation of 11.7 eV, confirming the existence of Mn 4+ in the powder [14,15].…”

Detection of Single Ag–Cu2O Particle Collision and Catalysis Using Impact Electrochemistry

“…This method, which focuses on single-entity electrochemistry detection, has garnered significant attention, particularly for its ability to unveil electrochemical processes taking place at the nanoparticle level during collisions with the working electrode. Impact electrochemistry, leveraging ultramicroelectrodes (UME), has proven instrumental in detecting a diverse range of redox electrocatalytic reactions. − In the field of single-particle detection, various types of synthetic and biological micro- and nanoswimmers act as mobile probes, efficiently exploring microscopic environments to locate and interact with electrodes. − The different morphologies and structure (e.g., porous) of microparticles play an important role in single-particle electrochemical detection due to its inherent benefits. The porous structure offers increased surface area compared to solid counterparts of equivalent size, creating more sites for interaction between the analyte and the electrode and enhancing the sensitivity of the detection process. , Porous structures provide a higher density of active sites on the electrode surface, with better electrocatalytic activity essential for many electrochemical detection methods .…”