One- or Two-Electron Water Oxidation, Hydroxyl Radical, or H₂O₂ Evolution

Abstract

Electrochemical or photoelectrochemcial oxidation of water to form hydrogen peroxide (HO) or hydroxyl radicals (OH) offers a very attractive route to water disinfection, and the first process could be the basis for a clean way to produce hydrogen peroxide. A major obstacle in the development of effective catalysts for these reactions is that the electrocatalyst must suppress the thermodynamically favored four-electron pathway leading to O evolution. We develop a thermochemical picture of the catalyst properties that determine selectivity toward the one, two, and four electron processes leading to OH, HO, and O.

Photoenzymatic Hydroxylation of Ethylbenzene Catalyzed by Unspecific Peroxygenase: Origin of Enzyme Inactivation and the Impact of Light Intensity and Temperature

“…[54] Future studies will also focus on photocatalysts with less * OH radical production to enhance the overall enzyme stability. [55] Experimental Section Chemicals TiO…”

Light‐Driven BiVO4–C Fuel Cell with Simultaneous Production of H2O2

“…[12] ↔ + +°= Below, we will discuss the rationality for selecting BiVO 4 as the photoanode and carbon as the cathode.…”

Multifunctional Nickel Film Protected n‐Type Silicon Photoanode with High Photovoltage for Efficient and Stable Oxygen Evolution Reaction

“…1.1 eV) for sunlight harvesting, and a long carrier diffusion length for facile charge transport compared with metal oxide semiconductors . Nevertheless, n‐Si based photoanodes suffer from low photovoltage, sluggish oxygen evolution reaction (OER) as well as severe corrosion when exposed to aqueous electrolyte, limiting their practical application for photoelectrochemical (PEC) water oxidation …”

“…[2,3] Nevertheless, n-Si based photoanodes suffer from low photovoltage, sluggish oxygen evolution reaction (OER) as well as severe corrosion when exposed to aqueous electrolyte, limiting their practical application for photoelectrochemical (PEC) water oxidation. [4][5][6] Many efforts have been devoted to stabilize Si photoelectrodes by employing chemically stable materials as corrosion-resistant protection layers, such as doped SiO x , transparent conductive www.advancedsciencenews.com www.small-methods.com in this study. First, the Al 2 O 3 interlayer is capable of reducing the Fermi level pinning caused by the direct contact between Ni and Si, and saturating the dangling bonds on the n-Si/SiO x surface.…”

“…Therefore, we propose that the Al 2 O 3 interlayer might possess less structural defects, which enables the elimination of strain and dangling bonds at the n-Si/SiO x /Ni interface, and thus forming a high-quality MIS junction for facile charge transport. [24] Additionally, the electric transport property of these MIS photoanodes with different interlayers were investigated by recording the cyclic voltammetry (CV) curves in a fastreversible redox couples Fe(CN) 6 3−/4− solution ( Figure S1, Supporting Information). [13] The Al 2 O 3 modified electrode shows a more negative Fe(CN) 6 4− oxidation potential compared with that of SiO 2 and TiO 2 modified electrodes, indicating that the photogenerated holes could easily arrive at the electrode surface to oxidize Fe(CN) 6 4− into Fe(CN) 6…”