Electrooxidation of benzyl alcohol and benzaldehyde on a nickel oxy-hydroxide electrode in a filter-press type cell

Abstract

The electrooxidation of benzyl alcohol and benzaldehyde in alkaline medium was carried out in a filter-press type cell on a nickel oxy-hydroxide electrode under different experimental conditions. An overpotential occurs in the presence of organic molecules in the solution shifting oxygen evolution towards higher potentials. The results obtained were conclusive that benzyl alcohol and benzaldehyde electrooxidation on NiOOH layers yielded benzoic acid as the main final reaction product. Chromatographic analysis of the bulk solution showed that the electrocatalytic oxidation of harmful molecules was carried out until the formation of acid compounds (benzoic acid) as an ultimate stage, suggesting that a Ni anode can be used successfully for waste remediation.

Electrochemical Oxidation of an Immunosuppressant, Mycophenolate Mofetil, and Its Assay in Pharmaceutical Formulations

“…A prewave was observed on more basic pH. This was attributed to formation of aldehyde from alcohol side chain [20] which in turn was formed due to the cleavage of the lactone ring. Further, highest peak intensity (for peak a 1 ) was noticed at pH 6.0 and then decreased continuously with further increase in pH.…”

Performance Assessment of a Polymer Electrolyte Membrane Electrochemical Reactor Under Alkaline Conditions − a Case Study With the Electrooxidation of Alcohols

“…Moreover, pioneering work performed by Ogumi and co-workers on the electrochemical hydrogenation of olefinic double bonds [8] and the reduction of nitrobenzene [9] was performed using a Nafion membrane-based SPE, within a similar configuration to PEMER, in which the product purification operations were then reduced. To the best of our knowledge and from a synthetic point of view, there are few works dealing with the electrooxidation of alcohols within a configuration similar to PEMER and/or filter-press electrochemical cell under alkaline conditions [10][11][12]. Benefits from the electrooxidation of alcohols in alkaline media is based on the more favourable electroorganic process, e.g., the electrooxidation of primary alcohols to its carboxylic acids requires lower anode potentials with a lower cost of electrocatalysts [13,14].…”

Potential Cycling Effects on Activities of Nickel-Mediated Benzyl Alcohol and Glycine Electrooxidation in Alkaline Solutions

“…Ni-(oxy) hydroxide-based materials such as nickel−iron oxyhydroxide (NiFeOOH) are promising earth-abundant catalysts for electrochemical water oxidation in basic media [3][4][5]. It was discovered in early 1971 that a series of amines and alcohols can be electrooxidized by nickel hydroxide [6,7]; for example, several electrooxidation reactions of benzyl alcohol in an alkaline medium were accomplished on different types of nickel hydroxide electrodes [8,9]. Glycine, as a biosynthetic intermediate of all purines and porphyrins, can be electrooxidized by Ni(OH) 2 as well [10].…”