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

The Study of Using Methane as the Direct Fuel for the Proton Exchange Membrane Fuel Cell under Ambient Temperature

Author GuoYanFeng
Tutor LiZhouPeng
School Zhejiang University
Course Chemical Engineering
Keywords Proton exchange membrane fuel cell Methane Anode catalyst Oxidant Working conditions Battery Performance
CLC TM911.4
Type Master's thesis
Year 2009
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Proton exchange membrane fuel cell (PEMFC) having a high power density, energy conversion efficiency is high, low temperature start-up and environment-friendly, etc. characteristics, therefore, is the electric automobile an ideal power for power supply one of the. PEMFC of the fuel mainly high purity hydrogen, but the high purity hydrogen's preparation, storage and transportation's cost is high, become a constraining PEMFC practical oriented the main obstacles to one of the. How to utilize fuel cell the use of inexpensive hydrocarbon fuels carry out electricity generation become the fuel cell technology research hotspot. Methane hydrogen content is high, has and hydrogen gas a considerable the electrochemical oxidation potential, wide variety of sources and belong to the renewable resources. Therefore to carry out using methane as a fuel's PEMFC technical For the to promote the PEMFC practical oriented has important significance. This article first in order to methane and hydrogen's mixed fuel lieu hydrogen as a an anode a fuel in order to improve hydrogen gas utilization rate of, and then, the use of rotating disk electrode technology research a in order to Pt (5 vvt.%) / C, Pt (46, vt.%) / C and Pt (40 wt.%)-Ru (20wt.%) / C used as anode catalyst O'clock, methane respectively, in 6 mol L -1 NaOH solution and 0.5 mol L -1 < / sup> H 2 SO 4 in solution the electrochemical Oxidation Reaction Activity, finally ScS of the methane as PEMFC a direct a fuel when the, affecting battery open circuit voltage and power density key factors . Studies show that, in order to methane and hydrogen a mixed gas of instead of hydrogen as a a fuel, with the the methane flow increases, the the fuel cell performance gradually reduced. Contrast the same an anode catalyst under the, methane in the 6 mol L -1 NaOH solution and 0.5 mol L -1 H 2 SO 4 in the solution electro-catalytic oxidation behavior of O'clock, methane in the 6 mol L -1 NaOH in solution show a higher the electrochemical oxidative activity; in the same electrolyte middle, along with anode catalyst in content of Pt the increase of, the catalyst of methane electrochemical oxidation Reaction catalytic activity of continuously increased, while the the anode catalyst Ru in component of the introduction of can be further improve the catalytic on Methane electrochemical oxidation Reaction catalytic activity. Catalyst, the working temperature, humidification temperature, and oxidant is the impact fuel cell power generation performance of the important factor. With the the anode catalyst in content of Pt the increase of and Ru components the introduction of, in order to methane as direct fuel of the PEMFC (simply referred to as of Direct Methane fuel cell DM-PEMFC) the maximum output power density gradually increases; as the gas the humidification temperature, and battery work the temperature rises, DM-PEMFC's open-circuit potential and the maximum output power density gradually increased; in order to H 2 O 2 replace the O 2 as the oxidizer when, DM-PEMFC the power density of been greatly improved. When the to Pt (40 wt.%)-Ru (20wt.%) / C as the anode catalyst, supported catalyst load an amount of 5 mg cm 2 , Pt (5, wt.%) / C as the cathode catalyst, the catalyst Tam load an amount of 5 mg cm -2 , the battery working temperature is 363 K, the humidification temperature was 383 K, in order to 30, wt.% H 2 O 2 as the oxidant, DM-PEMFC the maximum output power density of can reach 11.25 mW cm -2 , this time, oxidation of methane with efficiency is about 37.3%.

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