In‐Operando Mapping of pH Distribution in Electrochemical Processes

Abstract

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Overcoming barriers for nitrate electrochemical reduction: By-passing water hardness

“…During the blank experiments conducted using an unbuffered solution, the nitrate conversion achieved 82% and nitrate concentration diminished to 5.5 mg NO3 --N L -1 , which is below the MCL level of 10 mg NO 3 --N L -1 . The pH of unbuffered solution increased from 5.95 up to 10.15, which is a commonly observed feature in many other studies, regardless of electrode materials (Fuladpanjeh Hojaghan et al, 2019;Szpyrkowicz et al, 2006). The pH increase is explained by the release of hydroxyl anions during reduction processes described in Reaction ( 1) and ( 2).…”

Selective anodes for seawater splitting via functionalization of manganese oxides by a plasma-assisted process

“…7) [56]. This effect, in turn, results in the formation of pH gradients around Fe2O3 nanoparticles during OER process [75]. As a matter of fact, the pH value has a direct influence on aqueous electrochemical processes, and previous studies have shown that pH variations of different units can occur near the electrode surface with respect to bulk seawater [4,9,75].…”

Electrochemiluminescence (ECL)-Based Electrochemical Imaging Using a Massive Array of Bipolar Ultramicroelectrodes

“…Electrochemiluminescence (ECL) and fluorogenic reactions , have been employed as probes for direct mapping of electrocatalytic activity; luminol-based ECL systems are also commonly used in hydrogen peroxide sensors. , However, the processes which may be studied by such direct imaging methods are limited to a few reactions which produce a luminescent product. Changes in the fluorescence of pH-sensitive reporter species have also been utilized to image reactions which alter solution pH, − but the range of applications for this approach is similarly constrained. The Chen group recently used a fluorogenic reporter reaction to monitor a nonfluorogenic reaction via a competition mechanism .…”