Mediated enzyme electrodes with combined micro- and nanoscale supports

We report the electrochemical performance of a redox polymer-mediated glucose anode catalyzed by glucose oxidase and supported on a multiscale carbon material. The support is composed of carbon paper upon which is grown multiwall nanotubes by chemical vapor deposition combined with ohmic heating of the carbon paper. The material possessed 100-fold higher surface area and demonstrated tenfold higher electrochemical performance, compared to bare carbon paper. Maximum performance is limited by biocatalyst and reactant transport in the micro- and nanoscale pores of the support material. (c) 2007 The Electrochemical Society.