Abstract
A hybrid biofuel cell (HBFC) is explored as a low-cost alternative to abiotic and enzymatic biofuel cells. Here the HBFC provides an enzymeless approach for the fabrication of the anodic electrode while employing an enzymatic approach for the fabrication of the cathodic electrode to develop energy harvesting platform to power bioelectronic devices. The anode employed 250 μm braided gold wire modified with colloidal platinum (Au-co-Pt) and bilirubin oxidase (BODx) modified gold coated Buckypaper (BP-Au-BODx) cathode. The functionalization of the gold coated multi-walled carbon nanotube (MWCNT) structures of the BP electrodes is achieved by 3-mercaptopropionic acid surface modification to possess negatively charged carboxylic groups and subsequently followed by EDC/Sulfo-NHS (1-Ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-Hydroxysulfosuccinimide) crosslinking with BODx. The integration of the BODx and gold coated MWCNTs is evaluated for bioelectrocatalytic activity. The Au-co-Pt and BP-Au-BODx exhibited excellent electrocatalytic activity towards glucose oxidation with a linear dynamic range up to 20 mM glucose and molecular oxygen reduction, respectively. The HBFC demonstrated excellent performance with the largest open circuit voltages of 0.735 V and power density of 46.31 μW/cm2 in 3 mM glucose. In addition, the HBFC operating on 3 mM glucose exhibited excellent uninterrupted operational stability while continuously powering a small electronic device. These results provide great opportunities for implementing this simple but efficient HBFC to harvest the biochemical energy of target fuel(s) in diverse medical and environmental applications.
Highlights
Implantable technologies have garnered great attention due to their ability to prolong the life of an individual suffering from a disease and/or complications associated with a disease[1]
The most commonly used Biofuel cells (BFCs) comprises electrodes constructed from highly conductive multiwall carbon nanotubes (MWCNTs) that are functionalized by a hetero-bifunctional pyrenebutanoic succinimidyl ester molecule accomplished via non-covalent π-π interactions of the pyrene derivative with the pyrene on multi-walled carbon nanotube (MWCNT)-based electrode to immobilize glucose and oxygen selective enzymes[6,7]
We report the innovative hybrid biofuel cell (HBFC) that employs an enzymeless anodic electrode fabricated from 250 μm braided gold wire modified with colloidal platinum (Au-co-Pt) and covalent immobilization of BODx on gold coated Buckypaper (BP-Au-BODx) cathodic electrode
Summary
Implantable technologies have garnered great attention due to their ability to prolong the life of an individual suffering from a disease and/or complications associated with a disease[1]. We report the innovative hybrid biofuel cell (HBFC) that employs an enzymeless anodic electrode fabricated from 250 μm braided gold wire modified with colloidal platinum (Au-co-Pt) and covalent immobilization of BODx on gold coated Buckypaper (BP-Au-BODx) cathodic electrode.
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