Durability,-Stability,-Reliability-燃料电池.ppt

Fuel Cell:Durability, Stability, Reliability 2005-12-15 Keywords Long-term, durab*, stab*, degrad*, accelerated degradation test, accelerated life tests Web of Science is a good product by ISI ! Be cautious! Outline Current status Problems to crack Our work correlative A sample ECS 208th Meeting - Los Angeles October 16-21, 2005. Symposium X2: Durability and Reliability Low-Temperature Fuel Cells and Fuel Cell Systems A sample 53 Abstracts available at /jsp/mas/reportTechProg.jsp?MEETING_ID=200SYM_ID=347. A sample Catalyst and Catalyst Support Durability in PEMFCs Impact of Contaminants on PEMFC Durability Pt and Pt-Alloy Degradation Mechanisms in PEMFCs PEMFC Membrane Degradation Mechanisms Operating Conditions and Catalyst Impact on Membrane Degradation Materials Characterization with Respect to Membrane Degradation PEMFC Stack and System Membrane Degradation/Reliability PEMFC Freeze Degradation DMFC Durability subsection Catalyst and support Contaminants Membrane Freeze MEA Catalyst and support Catalyst size growth Support corrosion Catalyst and support Catalyst size growth[1,2,4] 1. Ostwald ripening/dissolution-redeposition 2. Crystallite migration and coalescence growth Pt dissolution[3,4] J.Electrochem.Soc.,1993, 140(10):2872. Chin. J. Cata.,2005,26(5):383 J.Electrochem.Soc.,2003,150(10):A1523 J.Electrochem.Soc., 2005,152(11): A2256 Chemical Physics Letters 395 (2004) 7–11 Pt nanoparticle growth A sample, J.Electrochem.Soc., 2005,152(11): A2256 Ostwald Migration 50%. Pt Ru dissolution, PtNi Ruthenium in the cathode after life test of DMFC (increased charge-transfer resistance of methanol oxidation, inhibits oxygen reduction.) dissolution potential Alloys alleviate Pt sintering/agglomerating Ref. Test on the degradation of direct methanol fuel cell. Electrochimica Acta,in press. Electrochemistry Communications 6 (2004) 795–799 Support corrosion Working condition: high water content, low pH (1), high temperature (50~90 ℃), high potential (