AUTHOR=Ginoux Erwann , Rafaïdeen Thibault , Cognet Patrick , Latapie Laure , Coutanceau Christophe 

TITLE=Selective glucose electro-oxidation catalyzed by TEMPO on graphite felt

JOURNAL=Frontiers in Chemistry

VOLUME=12

YEAR=2024

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2024.1393860

DOI=10.3389/fchem.2024.1393860

ISSN=2296-2646

ABSTRACT=<p>Long-term electrolyses of glucose in a potassium carbonate (K<sub>2</sub>CO<sub>3</sub>) aqueous electrolyte have been performed on graphite felt electrodes with TEMPO as a homogeneous catalyst. The influences of the operating conditions (initial concentrations of glucose, TEMPO, and K<sub>2</sub>CO<sub>3</sub> along with applied anode potential) on the conversion, selectivity toward gluconate/glucarate, and faradaic efficiency were assessed first. Then, optimizations of the conversion, selectivity, and faradaic efficiency were performed using design of experiments based on the L<sub>9</sub> (3<sup>4</sup>) Taguchi table, which resulted in 84% selectivity toward gluconate with 71% faradaic efficiency for up to 79% glucose conversion. Side products such as glucaric acid were also obtained when the applied potential exceeded 1.5 V vs. reversible hydrogen electrode.</p>