TAILIEUCHUNG - Biofuel's Engineering Process Technology Part 18

Tham khảo tài liệu 'biofuel's engineering process technology part 18', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Recent Development of Miniatured Enzymatic Biofuel Cells 671 We have introduced three types of functionalization on carbon surface in this session. In the future work we will immobilize different biomolecules based on these functionalization methods for EBFCs device. Work on building a prototype EBFC consisting of glucose oxidase immobilized anode and a laccase immobilized cathode using C-MEMS based interdigitated electrode arrays is underway. Fig. 5. Cyclic voltammograms showing the first and second cycle confirming the surface functionalization completed in the first irreversible cycle. 5. Simulation of C-MEMS based EBFCs Finite element approach for optimization of electrodes design For our simulation approach we used commercially available COMSOL software multiphysics software which solves partial differential equations PDEs by finite element technique. In the model we assume that 3D carbon microelectrode arrays were uniformly immobilized with glucose oxidase and laccase on anode and cathode respectively with out the use of any mediators. The proposed implantable membraneless EBFC is assumed to be placed inside a blood artery of the human body thus utilizes the glucose extracted from blood as a fuel. In principle glucose oxidase reacts with glucose and produces gluconolactone and hydrogen peroxide. This hydrogen peroxide oxidizes on the anode to generate electron and hydrogen ions. The hydrogen ions travel from electrolyte to cathode while electrons flow through an external load and generate electricity. On cathode dissolved oxygen is reduced via laccase enzyme and by combining with electrons and hydrogen ions forms water. We applied Michaelis-Menten theory in our 2D model to analyze phenomenon between enzyme kinetics on the electrode surface and glucose diffusion and thus optimize the electrode microarray design rule according to the enzyme reaction rate In order to determine the output potential in developing biofuel cell we also incorporated Nernst .

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