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Abstract
Based on the potential redox and catalytic ability of oxovanadium complexes, our goal was to characterize the physical properties of two such complexes to be used as mediators for laccase. Computational studies, TD-DFT calculations and docking simulations were performed to elucidate the interaction between laccase and the two anionic complexes (aquabis(oxalato)oxidovanadate(IV) (1) and bis(oxalato)dioxidovanadate(V)) (2), respectively. Electrochemical measurements carried out on anion complexes of 1 and 2 docked into laccase were compared to laccase alone, showing changes in oxidation-reduction potential and current value, especially with the oxovanadium anion of 2. Since both internal tiny magnetic fields of ferromagnetic catalysts and external applied magnetic fields were found in previous investigations to constitute effective ways to improve the oxygen transfer rate, the magnetic susceptibility was measured. A valence change proneness was confirmed with higher valence for the oxovanadium anion of 2, which is in accordance with the electrochemical results.
Highlights
The longstanding need for reliable sources of energy has produced an active interest in fuel cells
The first report of an enzymatic biofuel cell was published in 1964, and the topic has been studied for approximately 50 years [2]
The most common cathode reaction in a biofuel cell is the electroreduction of oxygen to yield water; a reaction catalyzed mainly by multicopper oxidase enzymes [3], the laccases/bilirubin oxidases
Summary
The longstanding need for reliable sources of energy has produced an active interest in fuel cells. Fuel cells’ drawbacks, including high cost, use of precious metals, and extreme pH values, have necessitated the development of enzymatic biofuel cells (EBFCs). Specific enzymes catalyze the same reactions as inorganic catalysts in fuel cells and may replace them in either the anode or the cathode, or both. Glucose/oxygen biofuel cells use an electron donor, glucose, fuel, an anode incorporating glucose oxidase to oxidize them, and a cathode incorporating laccase, which reduces oxygen to convert chemical energy into electrical energy [4] (Figure 1). This is based on the same principle whereby living
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