A numerical model was presented to predict the specific proton conductivity of the catalyst layer in Proton Exchange Membrane Fuel Cells (PEMFC).This model was derived from the random packed spheres with simple cubic,...A numerical model was presented to predict the specific proton conductivity of the catalyst layer in Proton Exchange Membrane Fuel Cells (PEMFC).This model was derived from the random packed spheres with simple cubic, body-centered cubic and face-centered cubic structures.The effects of sphere radius r_s, bulk proton conductivity k_b, contact parameter γ and contact angle α on proton transfer within a homogeneous agglomerate sphere consisting of carbon-supported catalyst and electrolyte were analyzed.A correlation equation of specific proton conductivity was obtained by data fitting.The real effective proton conductivity in the catalyst layer was measured by addition to a standard Membrane Electrolyte Assembly of an inactive composite layer in the electrolyte path between the anode and cathode. The model was validated by good agreement between calculations and measured data.展开更多
文摘A numerical model was presented to predict the specific proton conductivity of the catalyst layer in Proton Exchange Membrane Fuel Cells (PEMFC).This model was derived from the random packed spheres with simple cubic, body-centered cubic and face-centered cubic structures.The effects of sphere radius r_s, bulk proton conductivity k_b, contact parameter γ and contact angle α on proton transfer within a homogeneous agglomerate sphere consisting of carbon-supported catalyst and electrolyte were analyzed.A correlation equation of specific proton conductivity was obtained by data fitting.The real effective proton conductivity in the catalyst layer was measured by addition to a standard Membrane Electrolyte Assembly of an inactive composite layer in the electrolyte path between the anode and cathode. The model was validated by good agreement between calculations and measured data.
文摘以磺化度为75%的磺化聚醚醚酮(SPEEK)为原料,加入聚醚酰亚胺(PEI)和离子液体(ILs)制备SPEEK/PEI@ILs酸碱复合膜用于质子交换膜电解水制氢(PEMWE)中.研究复合膜的吸水率、溶胀度、质子电导率、热稳定性和相应的PEMWE性能.结果表明,SPEEK/PEI@ILs复合膜与商业Nafion117膜相比,具有相近的质子电导率和溶胀度,说明PEI的加入,增强了复合膜的尺寸稳定性.将SPEEK/PEI@ILs复合膜制备成膜电极并测试PEMWE性能,1 A/cm2电流密度下槽电压为2.75 V,在0.5 A/cm^(2)@1.96(±0.03)V条件下能稳定运行10 h.
