Liu, Gang
(Proton Exchange Membrane Fuel Cell Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)
,
Zhang, Huamin
(Proton Exchange Membrane Fuel Cell Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)
,
Hu, Jingwei
(Proton Exchange Membrane Fuel Cell Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)
,
Zhai, Yunfeng
(Proton Exchange Membrane Fuel Cell Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)
,
Xu, Dongyan
(Proton Exchange Membrane Fuel Cell Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)
,
Shao, Zhi-gang
(Proton Exchange Membrane Fuel Cell Key Materials and Technology Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China)
AbstractIn this paper, a 600h life test of a high temperature PEMFC based on phosphoric acid (H3PO4)-doped polybenzimidazole (PBI) (H3PO4/PBI HT-PEMFC) at a current density of 714mAcm−2 (the beginning 510h continuous test) and 300mAcm−2 (the last 90h intermittent test) was carried out. A...
AbstractIn this paper, a 600h life test of a high temperature PEMFC based on phosphoric acid (H3PO4)-doped polybenzimidazole (PBI) (H3PO4/PBI HT-PEMFC) at a current density of 714mAcm−2 (the beginning 510h continuous test) and 300mAcm−2 (the last 90h intermittent test) was carried out. After the life test, degradation of the MEA occurred. The H2 crossover rate through the PBI membrane and the open circuit voltage (OCV) of the cell were tested with time. The results showed that, at the beginning of 510h continuous test, the PBI membrane did not show much physical degradation, but during the last 90h test there was a remarkable physical degradation which resulted in a higher H2 crossover. The catalysts, PBI membranes and the membrane electrode assemblies (MEAs) before and after the life test were comprehensively examined by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). TEM results showed that the particle size of the Pt/C catalysts in the anode and cathode increased from 3.72 to 7.40 and 8.39nm, respectively. SEM images of MEA in cross-section revealed that the PBI membrane became thin after the life test. EDS analysis implied the leaching of H3PO4 from the PBI membrane had occurred. Therefore, we conclude that physical degradation of PBI membrane, agglomeration of the electrocatalysts (both anode and cathode) and the leaching of H3PO4 from the PBI membrane were responsible for the performance degradation of the H3PO4/PBI HT-PEMFC.
AbstractIn this paper, a 600h life test of a high temperature PEMFC based on phosphoric acid (H3PO4)-doped polybenzimidazole (PBI) (H3PO4/PBI HT-PEMFC) at a current density of 714mAcm−2 (the beginning 510h continuous test) and 300mAcm−2 (the last 90h intermittent test) was carried out. After the life test, degradation of the MEA occurred. The H2 crossover rate through the PBI membrane and the open circuit voltage (OCV) of the cell were tested with time. The results showed that, at the beginning of 510h continuous test, the PBI membrane did not show much physical degradation, but during the last 90h test there was a remarkable physical degradation which resulted in a higher H2 crossover. The catalysts, PBI membranes and the membrane electrode assemblies (MEAs) before and after the life test were comprehensively examined by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). TEM results showed that the particle size of the Pt/C catalysts in the anode and cathode increased from 3.72 to 7.40 and 8.39nm, respectively. SEM images of MEA in cross-section revealed that the PBI membrane became thin after the life test. EDS analysis implied the leaching of H3PO4 from the PBI membrane had occurred. Therefore, we conclude that physical degradation of PBI membrane, agglomeration of the electrocatalysts (both anode and cathode) and the leaching of H3PO4 from the PBI membrane were responsible for the performance degradation of the H3PO4/PBI HT-PEMFC.
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