Mass transfer studies of Geobacter sulfurreducens biofilms on rotating disk electrodes.

ABSTRACT: Electrochemical impedance spectroscopy has received significant attention recently as a method to measure electrochemical parameters of Geobacter sulfurreducens biofilms. Here, we use electrochemical impedance spectroscopy to demonstrate the effect of mass transfer processes on electron transfer by G. sulfurreducens biofilms grown in situ on an electrode that was subsequently rotated. By rotating the biofilms up to 530 rpm, we could control the microscale gradients formed inside G. sulfurreducens biofilms. A 24% increase above a baseline of 82 µA could be achieved with a rotation rate of 530 rpm. By comparison, we observed a 340% increase using a soluble redox mediator (ferrocyanide) limited by mass transfer. Control of mass transfer processes was also used to quantify the change in biofil

SUBMITTER: Babauta JT 

PROVIDER: S-EPMC4247833 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature