|
Biofuel cell (Biofuel cells, BFCs) is directly or indirectly the use of enzyme or microbial fungi as a catalyst the by electrochemical catalytic redox method to convert chemical energy into electrical energy a special kind of fuel cell. Because of the biofuel cell can make use of the biological metabolites, such as glucose, lactate, oxygen and other substances in the body generation requires continuous electrical energy pacemakers, biosensors, heart valves and other implantable electronic device provided in the body energy, and therefore has great potential value. At present, the field of basic research or the practical application of research have become one of the most popular areas of international bioelectrochemistry. However, the stability of the biofuel cell power density and other key issues hindering its development. The paper around these key issues, combined with the progress of recent years, materials science and other related fields, to carry out the enzyme biofuel cell yin and yang of the study, specific research can be summarized as follows: 1, the enzyme biofuel cell power density low key, choose a suitable mediator, nitrogen-based - bis - (3 - ethyl benzo dihydrothieno oxazoline -6 - sulfonic acid) diammonium salt (ABTS) as a cathode laccase (Laccase) electron mediator, using the mediator electrochemical cathode laccase increase and maintain a relatively high oxygen reduction potential of the oxygen reduction current. In the air and the environment, and 40 mM glucose concentration environment, the battery power of up to 20μW · cm-2, there is no the laccase cathode catalytic power of the Select mediator and controlled trials compared to almost doubled. 2, NAD is a coenzyme 300 dehydrogenase, has an important significance in the biofuel cell anode catalyst dehydrogenase. We first through the use of single-walled carbon nanotube (SWNTs) and NAD molecule adenine π-π interaction in the group between the fixed coenzyme NAD. On this basis, combined with the results of previous studies in the laboratory, polymethylene green (polyMG / SWNTs) complexes as the catalyst of the coenzyme NADH SWNTs electrochemical polymerization of methylene green (MG), cross-linked glucose build a glucose biofuel cell anode GDH / the NAD / polyMG / SWNTs dehydrogenase (GDH), the catalytic effect of the composite anode electrode constructed of glucose. And then combined with the previous chapter, the cathode an intermediary and enzymes fixed for integrated glucose biosensor experiments, and to build a good electrode development to become the direct use of the multimeter, simple and rapid detection of the amount of glucose in human serum. Experimental results show that the linear range of the sensor, the glucose concentration from 1.0 mm to 11.0 mm has a good linear relationship, quick and easy to use, simple to operate, the reliability of the experimental results. 3, to carry four different carbon nanomaterials, carbon nanotubes, graphene oxide, chemical reduction the graphene and electrochemical reduction of graphene A comparative study of the electrochemical catalytic properties. research. The results of the cyclic voltammetry found that the kinetics of the reaction of the type of probe molecule is not the same, wherein the electronic conductivity of the carbon nanotube and the electrochemical reduction of graphene rate faster than the graphene oxide. This has a close relationship with the nature of the carbon material, and surface chemical properties of the carbon material, such as the carboxyhemoglobin proportion C / O, quinone group of the formula, the surface electric charge, surface cleanliness and other aspects of the interaction results. The study can not only help to better understand the relationship between the structure of the carbon material / performance, but also provide a theoretical basis for the correct development of the synthesis of advanced electrochemical materials.
|