本文考察了直接甲醇燃料电池 (DMFC)不同催化剂载量的膜电极性能 .对催化剂层中Nafion含量进行优化 ,研究了Nafion含量对电池的阻抗的影响 .实验发现 :DMFC适宜的阳极Pt_Ru/C载量为Pt 4mg/cm2 、Nafion质量百分含量为 2 1.4 % ;高电流密度下 ,阴极Pt/C载量为Pt4mg/cm2 、Nafion质量百分含量为 2 1.4 %时 ,有较好的放电性能 ,继续增加Nafion含量 ,阴极的欧姆极化和浓差极化增大 ,电池性能下降
The performances of membrane electrode assemblies (MEAs)with various Pt loading were compared.The amount of Nafion in a catalytic layer was optimized,and the effect of Nafion loading on the resistance of MEAs was investigated with ac impedance spectroscopy.For a MEA with both Pt 4 mg/cm 2 in the anode and the cathode,suitable Nafion loading was 21.4 wt% in the anode.With 21.4 wt% Nafion loading in the cathode,the Direct Methanol Fuel Cells(DMFC) showed the highest performance at high current density.While,the DMFC performances came down,as Nafion loading increasing,for ohm and concentration polarization.
[1] RenXM ,ZelenayP ,ThomasS ,etal.RecentadvancesindirectmethanolfuelcellsatLosAlamosNationalLaboratory[J].J .PowerSources,2000,86:111~116.
[2] McnicolBD ,RandDAJ,WilliamsKR .Directmethanol_airfuelcellsforroadtransortation[J].J .PowerSources,1999,83:15~31.
[3] LiuL ,PuC ,ViswanathanR ,etal.,CarbonsupportedandunsuportedPt_Ruanodesforliquidfeeddirectmethanolfuelcells[J].ElectrochimicaActa,1998,43(24):3657~3663.
[4] ScottK ,TaamaWM ,ArgyropoulosPMaterialaspectsoftheliquidfeeddirectmethanolfuelcell[J].J .Ap pliedElectrochemistry,1998,28:1389~1397.
[5] BaldaufM ,PreidelW .Statusofthedevelopmentofadirectmethanolfuelcell[J].J .PowerSources,1999,84:161~166.
[6] AricoAS ,ShuklaAK ,El_khatibKM ,etal.,Effectofcarbon_supportedandunsupportedPt_Ruanodesontheperformanceofsolid_polymer_electrolytedirectmethanolfuelcells[J].J.Appl.Electrochem.1999,26:671~676.
[7] HorarthM ,ChristensenP ,HamnettA ,etal.,Thedesignandconstructionofhigh_performancedirectmethanolfuelcells,1.Liquid_feedsystems[J].J.PowerSources,1997,69:113~124.
[8] JungHD ,LeeCH ,KimCS ,etal.,Performanceofadirectmethanolpolymerelectrolytefuelcell[J].J .PowerSources.1998,71:169~173.
[9] MuellerJT ,UrbanPM .Characterizationofdirectmethanolfuelcellsbyacimpedance[J].J .PowerSources,1998,75:139~143.
[10] DiardJP ,GorrecBLe,MontellaC ,etal.,Impedancemeasurementsofpolymerelectrolytemembranefuelcellsrunningonconstantload[J].J .PowerSources,1998,74:244~245.