Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6618191 | Electrochimica Acta | 2013 | 10 Pages |
Abstract
Linear poly(ethylenimine) (LPEI) was modified by attachment of 3-(tetramethylferrocenyl)propyl groups to ca. 17% of its nitrogen atoms to form a new redox polymer, FcMe4-C3-LPEI, for use as an anodic mediator in glucose/O2 biofuel cells. Electrochemical properties of this polymer were compared to those of 3-(dimethylferrocenyl)propyl-modified LPEI (FcMe2-C3-LPEI). When FcMe4-C3-LPEI was complexed with glucose oxidase (GOx) and cross-linked with ethylene glycol diglycidyl ether (EGDGE) to form hydrogels on planar, glassy carbon electrodes, limiting catalytic bioanodic current densities of up to â¼1.4 mA/cm2 at 37 °C were produced. The use of tetramethylferrocene moieties in place of dimethylferrocene moieties lowered the E1/2 of the films by ca. 85 mV. FcMe4-C3-LPEI was shown to be the more effective polymer for use in biofuel cells and, when coupled with a stationary O2 cathode comprised of laccase and cross-linked poly[(vinylpyridine)Os(bipyridyl)2Cl2+/3+] (PVP-Os) as a mediator, produced power densities of up to 57 μW/cm2 at 37 °C. Power density increased to 126 μW/cm2 when a rotating biocathode was used. The power densities of biofuel cells made with either FcMe2-C3-LPEI or FcMe4-C3-LPEI were comparable. The FcMe2-C3-LPEI biofuel cells gave somewhat higher maximum currents, but the operating voltage and the stability of biofuel cells constructed with FcMe4-C3-LPEI was higher than that of cells using FcMe2-C3-LPEI. These polymers have immediate applications as amperometric glucose sensors as well as in biofuel cell materials and have the potential to be used in a wide range of small implantable electronic devices.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Matthew T. Meredith, David P. Hickey, Jordan P. Redemann, David W. Schmidtke, Daniel T. Glatzhofer,