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Study of interface Enzyme/Graphene/Electrode for application in glucose/O2 biofuel cells

Grant number: 13/03836-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): April 01, 2013
Effective date (End): March 31, 2014
Field of knowledge:Physical Sciences and Mathematics - Chemistry
Principal Investigator:Frank Nelson Crespilho
Grantee:Rodrigo Mitiuye Bosquê de Carvalho
Home Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

Biofuel cells (BFCs) can be described as bioelectrochemical devices responsible for the conversion of chemical energy originated from biochemical reaction into electrical energy. The aim characteristic of the BFCs is the presence of enzymes and/or microorganisms used as biological catalysts used in bioanodes and biocathodes. The study of BFCs has been much explored in the last years due to the possibility to use the so called "biobateries" for several applications such as implantable devices. Nowadays, BFCs are less attractive due to their lower power output and one of the main challenges today is to improve this kind of bioelectrochemical devices using electrochemical redox mediators and nanomaterials to improve the communication between enzyme and electrode surface using appropriate enzyme immobilization methodologies. Concerning the importance of use sustainable and renewable forms for energy generation, the aim purpose of this project is the development of an enzymatic BFC using flexible carbon fiber (FCF) for obtention of bioanode and biocathode. The bioanode will be obtained by immobilization of glucose dehydrogenase (GDH) and the biocathode by the immobilization of enzyme laccase(Lc) adsorbed physically onto FCF electrodes. Also, the electrochemical redox mediator methylene green (MG) will be used to obtain poly(methylene green)(PMG) by electrochemical polymerization. Finally, the study of the bioelectrocatalytic activity of the immobilized enzymes will be one the aim focuses of this project. For this purpose, cyclic voltammetry and linear sweep voltammetry will be used to study the electrochemical behavior of FCF modified electrodes in half-cell and unit-cell experiments.