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Evaluation of TEMPO‐NH2 and Oxalate Oxidase Enzyme for Complete Ethylene Glycol Oxidation

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Dream team: This study describes a biofuel cell that combines the organic catalyst TEMPO-NH2 and the oxalate oxidase enzyme for complete ethylene glycol (EG) oxidation. The electrochemical results provided high catalytic activity, stability, and power energy generation for the hybrid system. The analytical results confirmed that TEMPO-NH2 and OxOx respectively acted on complete EG oxidation by cleaving the C−C bond, allowing the harvesting of all the electrons from the fuel.


Abstract

This study describes the development of an ethylene glycol (EG) biofuel cell that combines the organic catalyst 4-amino-TEMPO (TEMPO-NH2) and the enzyme oxalate oxidase (OxOx) in solution for complete EG oxidation. Cyclic voltammetric curves recorded in the presence of EG showed that the hybrid TEMPO-NH2/OxOx catalyst provided 1.2 higher current density than the TEMPO-NH2 catalyst. Chronoamperometric assays after successive EG injections and long-term electrolysis at a fixed potential of 0.75 V (vs Ag/AgCl) showed that the hybrid TEMPO-NH2/OxOx catalyst in the presence of EG promoted 14 % and 58 % increase in the current obtained with the TEMPO-NH2 catalyst, respectively. High-performance liquid chromatography (HPLC) results confirmed that TEMPO-NH2 and OxOx respectively acted on EG oxidation and C−C bond cleavage, leading to complete EG oxidation, harvesting all 10 of the EG electrons and high catalytic activity.

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