Publication date: 10th November 2021
The synthesis of high-added value chemicals with the help of electrical power, have attracted great interest given the possibility to obtain high reaction yields, high selectivity, as well as ensure low or even no greenhouse gas emissions.
In this sense, the electroreduction of carboxylic acids can lead to the corresponding alcohol or aldehyde. The electrochemical reduction of oxalic acid (HOX), using Pb as working electrode (WE), led to the formation of glyoxylic acid (HOL) and glycolic acid (HGL), two highly used species in the pharmaceutical, agrochemical and adhesives industries, among others. [1], [2]
Herein we present the electrochemical reduction of three different dicarboxylic acids, namely oxalic acid (HOX), malonic acid (HMA) and glutaric acid HGT, in 0.5 M H2SO4 as electrolyte, using Pb foil and Ti foil with Pb(0) electrodeposited (Ti/Pb) as WE.
We observed a large increase in current density (j) when HOX is used, instead of HMA and HGT, which shows little to no significant j increase, compared to the Pb electrode, these results show more catalytic activity towards the reduction of HOX, which could be due to lack of electronic delocalization in dicarboxylic acid with three or more carbon atoms. In the case of using a Ti/Pb electrode, an increase in current density was observed compared to the case of the Pb foil, these results show a connection between the electrocatalysis and the amount of Pb in the surface, which would be studied in future works.
The authors want to acknowledge Universitat Jaume I (UJI-B2019-20) and Generalitat Valenciana (PROMETEO/2020/028) for financial support.
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