title: High-temperature proton-exchange-membrane fuel cells using an ether-containing polybenzimidazole membrane as electrolyte.
abstract: Herein, poly[2,2'-(p-oxydiphenylene)-5,5'-benzimidazole] (PBI) is synthesized from 3,3'-diaminobenzidine and 4,4'-oxybisbenzoic acid, and the membrane is prepared by solvent casting. The main characteristics of PBI are studied. In the preparation of the PBI/H(3) PO(4) composite membrane, the absorbing temperature of H(3) PO(4) is 120 °C, which leads to a membrane with a high content of H(3) PO(4) . Membrane electrode assemblies (MEAs) are fabricated from PBI/H(3) PO(4) membranes with the catalyst layer made of Pt/C, PBI, and polyvinylidene fluoride (230:12:7 w/w). The fabricated MEA is tested at 150 °C with dry hydrogen and oxygen gas at 0.2 MPa for both anode and cathode feeds. No degradation of voltage is seen during stability testing of the PBI/H(3) PO(4) membrane at a constant current for 100 h. The maximum power density is 1.17 W cm(-2) , and the maximum current density is 6.0 A cm(-2) with a Pt loading of 0.5 mg cm(-2) . The high performance of these membrane materials demonstrates that PBI can be regarded as an alternative membrane material for high-temperature proton-exchange-membrane fuel cells.
authors.affiliation: Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, PR China.
authors.forename: Jin
authors.initials: J
authors.lastname: Li
authors.forename: Xiaojin
authors.initials: X
authors.lastname: Li
authors.forename: Yun
authors.initials: Y
authors.lastname: Zhao
authors.forename: Wangting
authors.initials: W
authors.lastname: Lu
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Shao
authors.forename: Baolian
authors.initials: B
authors.lastname: Yi
mesh_terms: D001562:Benzimidazoles / Q000737:chemistry*; D011211:Electric Power Supplies; D004986:Ether / Q000737:chemistry*; D008567:Membranes, Artificial; D010756:Phosphoric Acids / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011522:Protons; D013696:Temperature
chemical_list: D001562:Benzimidazoles; D008567:Membranes, Artificial; D010756:Phosphoric Acids; D011108:Polymers; D011522:Protons; D004986:Ether; C030242:phosphoric acid