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Direct methanol fuel cell membrane electrode electrochemical and UI performance

Author: LiJiaChun
Tutor: ZhouTao;XieXiaoFeng
School: Central South University
Course: Chemical processes
Keywords: Direct methanol fuel cell AC impedance Anode diffusion layer Methanol permeability
CLC: TM911.4
Type: Master's thesis
Year: 2008
Downloads: 182
Quote: 3
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Abstract


The direct methanol fuel cell (DMFC) has environment-friendly, high theoretical specific energy, simple structure, fuel for easy carrying and storage, etc., has broad application prospects in the field of mobile power portable power. To carry out the DMFC membrane electrode electrochemical analysis the electrode dynamic changes of behavior and the impact of the internal battery mechanism, on the optimization of the a DMFC electrode structure and operating conditions, thereby increasing the performance and stability of the output of the battery is of great significance. Using electrochemical impedance measured the DMFC state AC impedance spectroscopy (EIS), and the discharge current and temperature of the internal resistance of the battery system, the charge transfer resistance, low-frequency inductance and low frequency resistance equivalent circuit analysis; preliminary determination by the constant phase angle element dynamic variation of the electrode inside the battery. The results show that, with the the divergent responses driving force increases, the overall battery internal ideal capacitor to concentration polarization in the middle of the transition process. This study used Ⅰ - Ⅴ polarization curve and the EIS method, the discharge performance and the performance of the hindered alcohol and the proton conductivity of Nafion membrane were investigated; pretreatment conditions and focus on the anode diffusion layer (GDL) of the membrane electrode (MEA) Toner Cartridge and Toner load a comprehensive optimization. The results indicate that the battery performance is mainly affected by the conductivity of the electrolyte membrane, the performance of the hindered alcohol, gas, liquid two-phase transfer factors. The Nafion117 electrolyte membrane having a strong hindered alcohol, showing a the Nafion112 and Nafion115 superior to film properties. The results showed that the prepared anode GDL, the use of a PTFE concentration of 5 wt% solution was subjected to pretreatment Toner Model BP2000 load 1mg/cm ~ 2 hours, the battery shows the best performance. Through hydrophobic treatment of the anode GDL and optimization, played a role to reduce the battery internal mass transfer resistance and increase the conductive properties of the GDL, thus improving the discharge performance of the battery. The effects of operating parameters such as fuel methanol concentration, methanol solution flow rate, cathode air flow and battery operating temperature on the battery performance. It was found that due to the various factors of the transmission, and methanol permeation of the fuel, the concentration of the methanol solution for 1 mol / L, the flow rate 4mL/min, the battery to achieve the best performance; increase of the cathode air flow rate can effectively improve the output of the battery power; temperature, can improve the the battery electrochemical reaction kinetics performance and reduce the internal resistance of the battery, the battery performance has been significantly improved. EIS-site testing the battery stability testing process. The results showed that, at the beginning of discharge, since the activation of the electrode, the internal resistance of the battery is decreased, the battery performance for some improvement process; can extend the discharge time of the ohmic resistance of the battery is gradually increased, the output performance of the battery occurs significantly attenuated .

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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