Catalyzed oxygen reduction on bilirubin oxidase (BOD) cathode, and glucose oxidation (GOx) on glucose oxidase anode with improved electron conducting abilities were studied. A glucose-oxygen biofuel cell was also constructed with those two enzyme electrodes for better performances. In part I, BOD el...
Catalyzed oxygen reduction on bilirubin oxidase (BOD) cathode, and glucose oxidation (GOx) on glucose oxidase anode with improved electron conducting abilities were studied. A glucose-oxygen biofuel cell was also constructed with those two enzyme electrodes for better performances. In part I, BOD electrocatalyst wired by the redox polymer of polyacrylamide poly(N-vinylimidazole) coordinated to [Os(4,4’-dichloro-2,2’-bipyridine)₂Cl]^(+/2+) (PAA-PVI-[Os(dCl-bpy)₂Cl]^(+/2+)) over the single-walled carbon nanotube (SWNT) layer for O₂ reduction was studied. The SWNTs, whose surfaces were treated to introduce carboxylic functional groups (SWNT-COOH), were utilized. An enhancement of current density by about 50% in comparison to the same BOD cathode on a conventional GC surface was obtained. Systematic studies with different amounts of SWNTs, BOD wt %, and amount of catalyst were carried out to find an optimized condition for the catalytic reduction of O₂. In part II, conducting molecules instead of the wiring redox polymer were introduced in the BOD electrocatalyst film layer for better electron transferring for the electrocatalytic O₂ reduction. As one method, the conducting molecules were simply mixed with BOD enzymes and copolymer of polyacrylamide poly(N-vinylimidazole) (PAA-PVI). For another method, the conducting molecules were covalently bonded to the PAA-PVI polymer, which was then cross-linked to BOD enzyme molecules. BOD cathodes were prepared by coating the BOD electrocatalyst films on the electrode surfaces and then employed for the reduction of O₂. Enhanced current densities of O₂ reduction were measured in comparison to that with the electrode with the BOD film not including any conducting species. In part III, GOx wired by the redox polymer of polyacrylamide poly(N-vinylimidazole) coordinated to [Os(4,4’-dimethyl-2,2’-bipyridine)₂Cl]^(+/2+) (PAA-PVI-[Os(dme-bpy)₂Cl]^(+/2+)) mixed with SWNT-COOH was employed as the electrocatalyst for the glucose oxidation. The current density for the glucose oxidation with the wired GOx enzyme electrode mixed with SWNT-COOHs was measured twice as high as the current with the same electrode without containing the SWNT-COOHs. The electrode also showed the inhibition effect against chloride ions. In part IV, glucose-oxygen biofuel cell composed of glucose oxidase anode and bilirubin oxidase cathode was constructed. For both electrodes, enzyme catalysts were wired by redox polymers and mixed with SWNT-COOHs for better activities. Under air saturated 3 mM glucose solution in pH 7.4 potassium phosphate buffer with 0.15M NaCl at 37.5℃, the obtained power density of the proposed biofuel cell was as high as 104 ㎼/㎠ with a voltage of 0.26 V, which demonstrated improved performances than those of the reported results.
Catalyzed oxygen reduction on bilirubin oxidase (BOD) cathode, and glucose oxidation (GOx) on glucose oxidase anode with improved electron conducting abilities were studied. A glucose-oxygen biofuel cell was also constructed with those two enzyme electrodes for better performances. In part I, BOD electrocatalyst wired by the redox polymer of polyacrylamide poly(N-vinylimidazole) coordinated to [Os(4,4’-dichloro-2,2’-bipyridine)₂Cl]^(+/2+) (PAA-PVI-[Os(dCl-bpy)₂Cl]^(+/2+)) over the single-walled carbon nanotube (SWNT) layer for O₂ reduction was studied. The SWNTs, whose surfaces were treated to introduce carboxylic functional groups (SWNT-COOH), were utilized. An enhancement of current density by about 50% in comparison to the same BOD cathode on a conventional GC surface was obtained. Systematic studies with different amounts of SWNTs, BOD wt %, and amount of catalyst were carried out to find an optimized condition for the catalytic reduction of O₂. In part II, conducting molecules instead of the wiring redox polymer were introduced in the BOD electrocatalyst film layer for better electron transferring for the electrocatalytic O₂ reduction. As one method, the conducting molecules were simply mixed with BOD enzymes and copolymer of polyacrylamide poly(N-vinylimidazole) (PAA-PVI). For another method, the conducting molecules were covalently bonded to the PAA-PVI polymer, which was then cross-linked to BOD enzyme molecules. BOD cathodes were prepared by coating the BOD electrocatalyst films on the electrode surfaces and then employed for the reduction of O₂. Enhanced current densities of O₂ reduction were measured in comparison to that with the electrode with the BOD film not including any conducting species. In part III, GOx wired by the redox polymer of polyacrylamide poly(N-vinylimidazole) coordinated to [Os(4,4’-dimethyl-2,2’-bipyridine)₂Cl]^(+/2+) (PAA-PVI-[Os(dme-bpy)₂Cl]^(+/2+)) mixed with SWNT-COOH was employed as the electrocatalyst for the glucose oxidation. The current density for the glucose oxidation with the wired GOx enzyme electrode mixed with SWNT-COOHs was measured twice as high as the current with the same electrode without containing the SWNT-COOHs. The electrode also showed the inhibition effect against chloride ions. In part IV, glucose-oxygen biofuel cell composed of glucose oxidase anode and bilirubin oxidase cathode was constructed. For both electrodes, enzyme catalysts were wired by redox polymers and mixed with SWNT-COOHs for better activities. Under air saturated 3 mM glucose solution in pH 7.4 potassium phosphate buffer with 0.15M NaCl at 37.5℃, the obtained power density of the proposed biofuel cell was as high as 104 ㎼/㎠ with a voltage of 0.26 V, which demonstrated improved performances than those of the reported results.
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