Membrane electrode assemblies based on porous silver electrodes for alkaline anion exchange membrane fuel cells

Abstract Porous silver membranes were investigated as potential substrates for alkaline fuel cell gas transport electrodes by both electrochemical half-cell measurements in aqueous KOH electrolyte and production of fuel cells utilising an anion-exchange polymer electrolyte. The silver membranes provide both electrocatalytic function, mechanical support and a means of current collection. The gas transport layers are cost effective compared to current gas transport media (∼3× more expensive) especially considering their greatly reduced thickness, and several hundred-fold superior electrical and thermal conductivity. Utilising Teflon-AF as a hydrophobisation agent allows production of very high performance cathodes, with platinum-free performance under oxygen at 25 °C of 248 mA cm −2 (0.70 V vs. RHE) and 575 mA cm −2 (0.60 V vs. RHE). Addition of a small amount of platinum (100 μg cm −2 ) increases the cathode performance to 1071 mA cm −2 , and 1756 mA cm −2 , respectively. An alkaline anion exchange membrane fuel cells constructed utilising these electrodes and an anion-exchange polymer electrolyte shows an open circuit potential of 1.05 V and a performance of 100 mA cm −2 at 0.6 V (60 mW cm −2 ).

[1]  P. Ross,et al.  The Corrosion of Carbon Black Anodes in Alkaline Electrolyte I . Acetylene Black and the Effect of Cobalt Catalyzation , 1984 .

[2]  Paul F. Mutolo,et al.  Solvent Processable Tetraalkylammonium-Functionalized Polyethylene for Use as an Alkaline Anion Exchange Membrane , 2010 .

[3]  Dc Kitty Nijmeijer,et al.  Anion exchange membranes for alkaline fuel cells: A review , 2011 .

[4]  B. Améduri,et al.  Polymeric materials as anion-exchange membranes for alkaline fuel cells , 2011 .

[5]  Plamen Atanassov,et al.  Novel KOH-free anion-exchange membrane fuel cell: Performance comparison of alternative anion-exchange ionomers in catalyst ink , 2010 .

[6]  S. Srinivasan,et al.  Fuel Cells: From Fundamentals to Applications , 2006 .

[7]  F. Yan,et al.  A Soluble and Conductive Polyfluorene Ionomer with Pendant Imidazolium Groups for Alkaline Fuel Cell Applications , 2011 .

[8]  Pei Kang Shen,et al.  A Highly Order‐Structured Membrane Electrode Assembly with Vertically Aligned Carbon Nanotubes for Ultra‐Low Pt Loading PEM Fuel Cells , 2011 .

[9]  Karl Kordesch,et al.  Advances, aging mechanism and lifetime in AFCs with circulating electrolytes , 2004 .

[10]  P. Ross,et al.  The Corrosion of Carbon Black Anodes in Alkaline Electrolyte IV . Current Efficiencies for Oxygen Evolution from Metal Oxide‐Impregnated Graphitized Furnace Blacks , 1986 .

[11]  Anthony Kucernak,et al.  A novel cathode for alkaline fuel cells based on a porous silver membrane , 2010 .

[12]  Won-Yong Lee,et al.  Performance of solid alkaline fuel cells employing anion-exchange membranes , 2008 .

[13]  Nigel P. Brandon,et al.  Review of gas diffusion cathodes for alkaline fuel cells , 2009 .

[14]  Karl Kordesch,et al.  Degradation modes of alkaline fuel cells and their components , 1992 .

[15]  John R. Varcoe,et al.  Oxygen reduction at the silver/hydroxide-exchange membrane interface , 2008 .

[16]  Jinhua Chen,et al.  Carbon nanotubes as a secondary support of a catalyst layer in a gas diffusion electrode for metal air batteries. , 2005, Journal of colloid and interface science.

[17]  P. Ross,et al.  The Corrosion of Carbon Black Anodes in Alkaline Electrolyte II . Acetylene Black and the Effect of Oxygen Evolution Catalysts on Corrosion , 1986 .

[18]  B. Popov,et al.  Non-precious metal catalysts synthesized from precursors of carbon, nitrogen, and transition metal for oxygen reduction in alkaline fuel cells , 2011 .

[19]  J. Besenhard,et al.  Carbon nanofiber-based active layers for fuel cell cathodes- preparation and characterization , 2005 .

[20]  D. Brett,et al.  A new application for nickel foam in alkaline fuel cells , 2009 .

[21]  H. Yanagi,et al.  Anion Exchange Membrane and Ionomer for Alkaline Membrane Fuel Cells (AMFCs) , 2008 .

[22]  M. Pourbaix.  Atlas of Electrochemical Equilibria in Aqueous Solutions , 1974 .

[23]  P. Serp,et al.  Pd and Pt–Ru anode electrocatalysts supported on multi-walled carbon nanotubes and their use in passive and active direct alcohol fuel cells with an anion-exchange membrane (alcohol = methanol, ethanol, glycerol) , 2009 .

[24]  R. Slade,et al.  Prospects for Alkaline Anion‐Exchange Membranes in Low Temperature Fuel Cells , 2005 .

[25]  Bruno G. Pollet,et al.  A novel method for preparing proton exchange membrane fuel cell electrodes by the ultrasonic-spray technique , 2011 .

[26]  K. Scott,et al.  The synthesis and characteristic of an anion conductive polymer membrane for alkaline anion exchange fuel cells , 2012 .

[27]  Jamie P. Kizewski,et al.  Membrane and Electrode Materials for Alkaline Membrane Fuel Cells , 2008 .

[28]  Michel De Paepe,et al.  Thermodynamic model for an alkaline fuel cell , 2009 .

[29]  Karl Kordesch,et al.  Development of low cost alkaline fuel cells , 1986 .

[30]  A. Roberts,et al.  Alkaline ionomer with tuneable water uptakes for electrochemical energy technologies , 2011 .

[31]  A. Zhu,et al.  Anion exchange membranes based on quaternized polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene for direct methanol alkaline fuel cells , 2010 .

[32]  A. Kucernak,et al.  Cathode development for alkaline fuel cells based on a porous silver membrane , 2011 .

[33]  P. Ross,et al.  Oxygen electroreduction on Ag(111) : The pH effect , 2007 .

[34]  P. Ross,et al.  The Corrosion of Carbon Black Anodes in Alkaline Electrolyte III . The Effect of Graphitization on the Corrosion Resistance of Furnace Blacks , 1988 .

[35]  K. Scott,et al.  The effect of electrode parameters on the performance of anion exchange polymer membrane fuel cells , 2011 .