Enzymatic Fuel Cells For Electric Power
Generation From Domestic Wastewater
Author(s)
M. S. Kiliç, S. Korkut & B. Hazer
Abstract
Enzymatic biofuel cells (EFCs), which employ enzymes as a catalyst, convert the
chemical energy released from the enzymatic oxidation of fuel into electrical
energy. While chemical energy is being generated by the oxidation of fuel with
enzymes, electricity is generated simultaneously by the movement of electrons
released as a consequence of this chemical reaction from anode through cathode
in enzymatic fuel cells. The major problem encountered in EFC studies is the
difficult/slow electron transfer between the enzyme and the electrode. To
mediate the electron transfer between the enzyme and the electrode’s surface,
low molecular weight redox compounds called mediators are used in EFC.
Higher power generation and minimal interference effects at a lower cell
potential are achieved by using a mediator in EFC. The scope of this study is for
the development of an enhanced electron transferred EFC with a proper mediator
for the generation of electrical energy by the oxidation of glucose in domestic
wastewater. Therefore, glucose in domestic wastewater is utilised for energy
generation. In this study, Polypyrrole-2-carboxyclic acid was modified with
various mediators such as, ferrocene, neutral red and p-benzoquinone, which
were tested for this purpose. The maximum power density (100 nW/cm2) was
observed for the ferrocene modified electrodes including glucose oxidase and
laccase as anodic and cathodic enzyme, respectively. The electrode fabrication
step was optimized with respect to the electrode material, its operational
potential and the thickness of the polymeric film. The highest current values
were obtained from the addition of 10 mM of glucose for the EFC system
designed with the gold electrode material and operated with a working potential
of 0.45 V. The most suitable polymeric film thickness was achieved in the cyclic
voltammetry parameters set up with a scan rate of 50 mV/s and 25 cycles. The
Keywords
pyrrole-2-carboxylic acid, enzymatic fuel cell, glucose oxidase, laccase, glucose, fuel
Related Book
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