Performance analysis and impedance spectral signatures of high temperature PBI–phosphoric acid gel membrane fuel cells

Polarization curves, i.e., dc performance, and impedance spectral signatures of polybenzimidazole (PBI)–phosphoric acid (H3PO4) membrane fuel cells are obtained in the temperature range of 160–180 ◦ C, in an effort to investigate the effect of temperature, anode humidification, various cathode stoichs, and use of oxygen versus air. Thus, in situ electrochemical impedance spectroscopy (EIS) was used to obtain various resistances, ohmic as well as charge-transfer resistances, under these conditions. The results obtained show that PBI–H3PO4 gel membrane fuel cells exhibit very good performance in the temperature range of 160–180 ◦ C with an ohmic resistance similar to Nafion. Mass transfer limitations were determined by comparing performance polarization curves with air and oxygen along with EIS. Further EIS was also used to obtain signatures during fuel starvation, and electrical shorting across the cell.

[1]  C. Kontoyannis,et al.  A quasi-direct methanol fuel cell system based on blend polymer membrane electrolytes , 2002 .

[2]  J. Reynolds,et al.  Aramid and imidazole based polyelectrolytes: physical properties and ternary phase behavior with poly(benzobisthiazole) in methanesulfonic acid , 1993 .

[3]  G. Wegner,et al.  Proton transport in polybenzimidazole blended with H3PO4 or H2SO4 , 2002 .

[4]  Li Qingfeng,et al.  Phosphoric acid doped polybenzimidazole membranes: Physiochemical characterization and fuel cell applications , 2001 .

[5]  Jesse S. Wainright,et al.  High pressure electrical conductivity studies of acid doped polybenzimidazole , 1998 .

[6]  I. Raistrick.  Impedance studies of porous electrodes , 1990 .

[7]  Ravindra Datta,et al.  Systematic Approach to Design Higher Temperature Composite PEMs , 2005 .

[8]  Jesse S. Wainright,et al.  Acid-doped polybenzimidazoles : a new polymer electrolyte , 1995 .

[9]  Marc Doyle,et al.  Ionic Conductivity of Nonaqueous Solvent-Swollen Ionomer Membranes Based on Fluorosulfonate, Fluorocarboxylate, and Sulfonate Fixed Ion Groups , 2001 .

[10]  W. H. Li,et al.  Electrochemical deposition of Copper on patterned Cu/Ta(N)/SiO2 surfaces for super filling of sub-micron features , 2001 .

[11]  Deborah J. Jones,et al.  On the doping of sulfonated polybenzimidazole with strong bases , 2001 .

[12]  Deborah J. Jones,et al.  Investigation of the conduction properties of phosphoric and sulfuric acid doped polybenzimidazole , 1999 .

[13]  Ravindra Datta,et al.  Synthesis and characterization of Nafion®-MO2 (M = Zr, Si, Ti) nanocomposite membranes for higher temperature PEM fuel cells , 2005 .

[14]  N. Ogata,et al.  Synthesis and proton conductivity of thermally stable polymer electrolyte: poly(benzimidazole) complexes with strong acid molecules , 2000 .

[15]  Ronghuan He,et al.  PBI‐Based Polymer Membranes for High Temperature Fuel Cells – Preparation, Characterization and Fuel Cell Demonstration , 2004 .

[16]  V. Antonucci,et al.  Sulfonated polybenzimidazole membranes — preparation and physico-chemical characterization , 2001 .

[17]  Mariana Ciureanu and,et al.  Electrochemical Impedance Study of PEM Fuel Cells. Experimental Diagnostics and Modeling of Air Cathodes , 2001 .

[18]  Ronghuan He,et al.  Proton conductivity of phosphoric acid doped polybenzimidazole and its composites with inorganic proton conductors , 2003 .

[19]  Ronghuan He,et al.  The CO Poisoning Effect in PEMFCs Operational at Temperatures up to 200°C , 2003 .

[20]  F. R. McLarnon,et al.  Fuel cell handbook , 1988 .

[21]  N. Bjerrum,et al.  Hydrogen Oxidation on Gas Diffusion Electrodes for Phosphoric Acid Fuel Cells in the Presence of Carbon Monoxide and Oxygen , 1995 .

[22]  R. Datta,et al.  TEOM: A novel technique for investigating sorption in proton-exchange membranes , 2005 .

[23]  M. Minutoli,et al.  Influence of composition and acid treatment on proton conduction of composite polybenzimidazole membranes , 2001 .

[24]  Qingfeng Li,et al.  Approaches and Recent Development of Polymer Electrolyte Membranes for Fuel Cells Operating above 100 °C , 2003 .

[25]  J. Kerres.  Development of ionomer membranes for fuel cells , 2001 .

[26]  Norman Munroe,et al.  Mathematical model of a PEMFC using a PBI membrane , 2006 .

[27]  R. Bouchet,et al.  Proton conduction in acid doped polybenzimidazole , 1999 .

[28]  Nikhil H. Jalani,et al.  The effect of equivalent weight, temperature, cationic forms, sorbates, and nanoinorganic additives on the sorption behavior of Nafion ® , 2005 .

[29]  Yann Bultel,et al.  Oxygen reduction reaction kinetics and mechanism on platinum nanoparticles inside Nafion , 2001 .

[30]  K. Kreuer.  On the development of proton conducting polymer membranes for hydrogen and methanol fuel cells , 2001 .