Ülkü ANIK, Sema ASLAN, Murat TUTUM, Yudum TEPELİ

Comparison of in uence of nanomaterials on a glassy carbon pasteelectrode-based bioanode in biofuel cells

This paper presents a comparative study of nanomaterial modi ed glassy carbon paste electrodes (GCPEs)used as bioanodes in enzymatic biofuel cells. The developed bioanode electrodes were obtained by modi cation ofcomposite GCPEs with glucose oxidase (GOx) and different nanomaterials like manganese(IV) oxide nanoparticle (MnO2np) and aluminum titanate (Al2O3{TiO2) bimetallic nanostructure. These nanostructures were utilized in a GCPE-based enzymatic bioanode construction for the rst time. P-benzoquinone mediator was used for the electron transferbetween enzyme redox center and bioanode electrode where glucose analyte was used as substrate. A laccase-modi edplain GCPE was used as biocathode electrode. Then these electrodes were combined in a membraneless biofuel cell(BFC). The power densities of single cell BFCs were 0.619 W cm2(at 34 mV) for the plain GCPE, 4.57 W cm2(at 76 mV) for the GOx/MnO2np/GCPE, and 1.41 W cm2(at 36 mV) for the GOx/Al2O3{TiO2/GCPE. As aresult, it has been observed that the MnO2np/GOx/GCPE exhibits the best power density. The current density valueof this bioanode has also been examined and found to be 99.21 A cm2in phosphate buffer solution (pH 7) withmaximum open circuit potential of 294 mV.

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