TY - GEN
T1 - DEVELOPMENT OF HIGH PERFORMANCE MICRO DMFCS AND A DMFC STACK
AU - Lu, Guoqiang
AU - Wang, Chao Yang
N1 - Funding Information:
This work was supported by DARPA Microsystem Technology Office (MTO) under contract no. DAAH01-1-R001. The first author appreciates F.Q.Liu and P.C.Lim at ECEC at Penn State University for helps in some experiments.
Publisher Copyright:
Copyright © 2005 by ASME.
PY - 2005
Y1 - 2005
N2 - A silicon-based micro direct methanol fuel cell (µDMFC) for portable applications has been fabricated and its electrochemical characterization carried out. A membrane-electrode assembly (MEA) was specially fabricated to mitigate methanol crossover. The cell with the active area of 1.625 cm2 demonstrated a maximum power density of 50 mW/cm2 at 60°C. Since silicon wafer is too fragile to compress for sealing, and a thicker layer of gold has to be coated on the silicon wafer to reduce contact resistance, further development of micro DMFCs for high power application was carried out using stainless steel plate as bipolar plate in which flow channels were fabricated by photochemical etching technology. The maximum power density of the micro DMFC reaches 62.5 mW/cm2 at 40 °C and 100 mW/cm2 at 60°C with atmospheric pressure. An 8-cell air-breathing DMFC stack has been developed. Mass transport phenomena such as water transport, and oxygen transport were investigated. By using a water management technique, cathode flooding was avoided in our air-breathing DMFC stack. Furthermore, it was found that oxygen transport in the air-breathing cathode is still very efficient. The DMFC stack produced a maximum output power of 1.33 W at 2.21 V at room temperature, corresponding to a power density of 33.3 mW/cm2. A passive DMFC using pure methanol was demonstrated with steady-state output power of 20-25 mW/cm2 over more than 10 hours without heat management.
AB - A silicon-based micro direct methanol fuel cell (µDMFC) for portable applications has been fabricated and its electrochemical characterization carried out. A membrane-electrode assembly (MEA) was specially fabricated to mitigate methanol crossover. The cell with the active area of 1.625 cm2 demonstrated a maximum power density of 50 mW/cm2 at 60°C. Since silicon wafer is too fragile to compress for sealing, and a thicker layer of gold has to be coated on the silicon wafer to reduce contact resistance, further development of micro DMFCs for high power application was carried out using stainless steel plate as bipolar plate in which flow channels were fabricated by photochemical etching technology. The maximum power density of the micro DMFC reaches 62.5 mW/cm2 at 40 °C and 100 mW/cm2 at 60°C with atmospheric pressure. An 8-cell air-breathing DMFC stack has been developed. Mass transport phenomena such as water transport, and oxygen transport were investigated. By using a water management technique, cathode flooding was avoided in our air-breathing DMFC stack. Furthermore, it was found that oxygen transport in the air-breathing cathode is still very efficient. The DMFC stack produced a maximum output power of 1.33 W at 2.21 V at room temperature, corresponding to a power density of 33.3 mW/cm2. A passive DMFC using pure methanol was demonstrated with steady-state output power of 20-25 mW/cm2 over more than 10 hours without heat management.
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U2 - 10.1115/FUELCELL2005-74090
DO - 10.1115/FUELCELL2005-74090
M3 - Conference contribution
AN - SCOPUS:85148072126
T3 - ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2005
SP - 373
EP - 379
BT - ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2005
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2005 3rd International Conference on Fuel Cell Science, Engineering and Technology, FUELCELL 2005
Y2 - 23 May 2005 through 25 May 2005
ER -
