Abstract
In research on enzyme-based biofuel cells, covalent or noncovalent molecular modifications of carbon-based electrode materials are generally used as a method for immobilizing enzymes and/or mediators. However, the influence of these molecular modifications on the electrochemical properties of electrode materials has not been clarified. In this study, we present the electrochemical properties of chemical vapor deposition (CVD)-grown monolayer graphene electrodes before and after molecular modification. The electrochemical properties of graphene electrodes were evaluated by cyclic voltammetry and electrochemical impedance measurements. A covalently modified graphene electrode showed an approximately 25-fold higher charge transfer resistance than before modification. In comparison, the electrochemical properties of a noncovalently modified graphene electrode were not degraded by the modification.
Highlights
IntroductionCompared to traditional fuel cells, Enzyme-based biofuel cells (EBFCs) work under mild conditions (e.g., room temperature and neutral pH) and they are attracting as portable power sources and implantable medical devices
Enzyme-based biofuel cells (EBFCs) are fuel cells using an oxidoreductase as a catalyst and generate electricity by utilizing the oxidation of sugars or alcohols and the reduction of oxidant [1].Compared to traditional fuel cells, EBFCs work under mild conditions and they are attracting as portable power sources and implantable medical devices
We investigated the electrochemical properties of graphene electrodes before and after molecular modification
Summary
Compared to traditional fuel cells, EBFCs work under mild conditions (e.g., room temperature and neutral pH) and they are attracting as portable power sources and implantable medical devices Their low power density and short lifetimes have limited the practical use of EBFCs. their low power density and short lifetimes have limited the practical use of EBFCs These issues involve the enzyme stability, the electron transfer rate, and the enzyme loadings. MET-type reaction systems become more complex due to use of mediators, they can enhance the power density and efficiency of biofuel cell performance by accelerating the electron transfer between the active site of enzyme biocatalysts and an electrode via mediators [4,5]. In most of studies on EBFC, carbon-based materials have been
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