Abstract
Performance of gas-diffusion biocathodes to electrochemically reduce oxygen for biofuel cells was improved by introduction of a new water-soluble binder for carbon powder to form electrode layer on ozone-hydrophilized carbon paper (CP) electrode base. Four kinds of water-soluble binders for carbon powder were compared and sodium polyglutamate (PGluNa) was selected for use in combination with styrene-butadiene rubber (SBR) latex to form a hydrophilic binder. The biocathode with the binder revealed the largest cathodic current among the four biocathodes with different binders in cyclic voltammetry at 0 V vs. Ag/AgCl. Glutaraldehyde (GA) was adopted as a crosslinker of bilirubin oxidase (BOD) to improve the stability of the biocathodes, which stabilized the cathodic current as expected, however excessive GA caused denaturation of BOD to decrease the enzyme activity. Long-term stability test of the biocathode utilizing a binder of PGluNa by chronoamperometry revealed good stability of oxygen reduction current for 1 h.
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