Enhanced Biofuel Cells Based on a Hybrid Enzymatic/Bimetallic Composite for Complete Lactate Catalytic Electrooxidation
Jefferson Honorio Franco, João Victor Bonaldo, Shelley D. Minteer, Adalgisa R. De Andrade
TL;DR
A new hybrid electrode combining a bimetallic composite and an enzyme improves lactate oxidation in biofuel cells, leading to higher efficiency and complete conversion to CO2.
Contribution
A hybrid enzymatic/bimetallic composite electrode is introduced, achieving complete lactate electrooxidation with enhanced catalytic performance.
Findings
The hybrid electrode showed 2.0-fold higher catalytic activity than the bimetallic composite alone.
The hybrid electrode achieved a 35% higher maximum current density and lower charge transfer resistance.
Lactate was completely oxidized to CO2, harvesting all 10 electrons during the reaction.
Abstract
We describe complete lactate electrooxidation in an enzymatic biofuel cell that combines the catalytic action of the bimetallic composite Ru@Pt-CNT and the enzyme oxalate oxidase (OxOx). The Ru@Pt-CNT/OxOx hybrid electrode was 2.0-fold more catalytically active than the electrode containing the bimetallic composite only. During chronoamperometric experiments, the hybrid electrode achieved a 35% higher maximum current density (2.65 ± 0.15 mA cm–2) than the Ru@Pt-CNT electrode. Electrochemical impedance spectroscopy showed that the hybrid electrode had lower charge transfer resistance than the Ru@Pt-CNT electrode, confirming that OxOx had a high affinity for lactate during the bioelectrocatalytic reaction on the electrode surface. Furthermore, 18-h long-term bulk electrolysis revealed that lactate electrooxidation at the Ru@Pt-CNT/OxOx hybrid electrode provided a total charge of 1.2 ± 0.2…
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Taxonomy
TopicsElectrochemical sensors and biosensors · Electrocatalysts for Energy Conversion · Electrochemical Analysis and Applications