جستجوی مقالات مرتبط با کلیدواژه « پیل سوختی میکروبی » در نشریات گروه « شیمی »

A microbial fuel cell (MFC) is a device that converts chemical energy into electrical energy through the catalytic processes of microorganisms. In this study, a graphite-based flexible film was obtained by adding of zinc powder to a mixture of multi walled carbon nanotubes-graphite powder-polyvinyl chloride (PVC) and then selectively replacing of palladium (Pd) with Zn in a solution containing PdCl2. Surface morphology studies showed that the flexible film has a porous structure, where palladium and carbon nanotubes as uniform conduction channels are present in composite of the film. Electrochemical studies also showed that porous Pd/MWCNTs-Graphite-PVC film as a cathode in MFC at 22-ohm resistance has a current density and power density of 568 mA/m2 and 18500 µW/m2, respectively (compared to 191 mA/m2 and 810 µW/m2 for Pt foil), showing excellent electrochemical activity of the modified film for O2 reduction. Improved electrocatalytic behavior of the modified film can be attributed to porous structure of film and synergistic effect between CNTs and palladium. The method presented in this research can be employed as a favorite method for preparing of suitable electrocatalysts based on commercial graphite powder in the microbial fuel cells.

A microbial fuel cell (MFC) is a device that converts chemical energy into electrical energy through the catalytic processes of microorganisms. In this study, flexible and porous WO3/CNTs-Graphite-PVC film was fabricated through uniform adding of Zn powder into matrix of carbon nanotubes-graphite- Polyvinyl Chloride) PVC (film followed by selective dissolving of Zn from the film structure in acidic solution and finally electrodeposition of WO3 (Tungsten trioxide) into previously porous CNTs-Graphite-PVC film. Surface morphology studies showed that the flexible film has rough and porous structure and carbon nanotubes are uniformly present as electron conduction channels within the composite film. Studies also showed that porous WO3/MWCNTs-Graphite-PVC film as a bioanode in MFC at resistance of 1000 ohms and current density of 900 mA/m2 has a power density of 324 mW/m2. The method presented in this research can be used as a suitable method for preparing of suitable electrocatalysts based on commercial graphite powder in microbial fuel cells.

The energy consumption in different industries is increasing so fast in recent years. Although fossil fuels have been the main source of energy, some deficiencies such as their limitations and instability and also their drastic impacts on the environment and greenhouse emissions have obliged people to provide their required energy from alternative sources, especially regenerative ones. One of such energy sources is the application of Microbial Fuel Cells (MFC) which is used for electricity generation. In MFSs proton and electron are produced in anode anaerobic chamber through the oxidation of microorganism substrates. Protons diffuse through the proton exchange membrane and electrons go to the cathode chamber through the external circuit. Electrons and protons produce water in presence of oxygen as an electron acceptor. Consequently, the process of MFCs is significant in terms of economic aspects. Modeling and simulation are methods of characterization of MFCs. For this purpose, after the modeling and simulation of a two-chamber MFC, important parameters namely temperature and substrate flowrate were investigated. Investigations on the effect of substrate flowrate in three steps (0.8 Qa= 18 cm3/h, 1.2 Qa = 27 cm3/h, Qa = 22.5 cm3/h) showed that the highs power was achieved in 22.5 cm3/h. Additionally, the effect of temperature was assessed in 298-333K, where the highest power was achieved in 298K.

Microbial Fuel Cell (MFC) is of the renewable energy in which microorganisms play the role of biocatalysts in Ox/Red reactions of a substrate like glucose. In MFC electrode is a key component. In this work, a porous nano-biocomposite electrode based on Bacterial Cellulose (BC) and polyaniline as continuous and dispersed phases respectively were synthesized by in situ chemical polymerization of 4 various concentrations of aniline. The synthesis was studied by FT-IR and FE-SEM. Then it was applied in MFC as an anode. Performance of MFC was examined in presence of new anodes. The resistance of electrodes and produced power and current densities were measured. The maximum power of 375mW/m3 and current of 617 mA/m2 were recorded for the system for the anode with maximum aniline concentration.