Journal
ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING
Volume 13, Issue 1, Pages -Publisher
WILEY
DOI: 10.1002/apj.2149
Keywords
bioanode; enzyme fuel cell; enzyme immobilization; glucose oxidase
Categories
Funding
- Scientific and Technological Research Council of Turkey (TUBITAK) [213M031]
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Ferrocene-functionalized polyethylenimine and multiwalled carbon nanotubes were attached covalently by glutaraldehyde onto a carbon cloth to develop an immobilized enzyme (glucose oxidase) electrode for biofuel cell applications. Developed enzymatic anode was characterized by electrochemical methods to determine electrochemical performance. Anodic open-circuit potential was measured as within 0-20 mV range. Cyclic voltammetry showed anodic peak for glucose oxidation around 400-600 mV (vs. sat. Ag/AgCl) varying with scan rate. An enzyme fuel cell with 2.5 mg/cm(2) glucose oxidase-loaded bioanode and 0.70 mg/cm(2) Pt-loaded cathode attached to Nafion 115 membrane has provided around 2.5 mA/cm(2) current density at short-circuit conditions. Enzymatic kinetic parameters of prepared anode were determined by electrochemical methods that surprisingly indicated less K-M (i.e., better substrate affinity) than that of determined by conventional enzymatic methods. Enzymatic stability determined by electrochemical methods moreover indicated longer enzyme half-life.
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