Porosity-graded micro-porous layers for polymer electrolyte membrane fuel cells

Abstract In this paper, the effect of porosity-graded micro-porous layer (GMPL) on the performance of polymer electrolyte membrane fuel cells (PEMFCs) was studied in detail. The GMPL was prepared by printing micro-porous layers (MPL) with different content of NH4Cl pore-former and the porosity of the GMPL decreased from the inner layer of the MPLs at the membrane/MPL interface to the outer layer of the MPLs at the gas diffusion electrode/MPL interface. The morphology and porosity of the GMPLs were characterized and the performance of the cell with GMPLs was compared with those having conventional homogeneous MPLs. The result demonstrates that the fuel cells consisting of GMPL have better performance than those consisting of conventional homogeneous MPLs, especially at high current densities. Micro-porous layer with graded porosity is beneficial for the electrode process of fuel cell reaction probably by facilitating the liquid water transportation through large pores and gas diffusion via small pores in the GMPLs.

[1]  A. Shukla,et al.  Diffusion layer parameters influencing optimal fuel cell performance , 2000 .

[2]  M. Kaviany.  Principles of heat transfer in porous media , 1991 .

[3]  Jean St-Pierre,et al.  In-plane gradients in fuel cell structure and conditions for higher performance , 2003 .

[4]  Ramin Roshandel,et al.  The effects of porosity distribution variation on PEM fuel cell performance , 2005 .

[5]  Tae-Hee Lee,et al.  Influence of pore-size distribution of diffusion layer on mass-transport problems of proton exchange membrane fuel cells , 2002 .

[6]  E. Ticianelli,et al.  Effects of the carbon powder characteristics in the cathode gas diffusion layer on the performance of polymer electrolyte fuel cells , 2002 .

[7]  T. Fuller,et al.  A Historical Perspective of Fuel Cell Technology in the 20th Century , 2002 .

[8]  Zhigang Qi,et al.  Improvement of water management by a microporous sublayer for PEM fuel cells , 2002 .

[9]  Brant A. Peppley,et al.  Modeling the Influence of GDL and flow-field plate parameters on the reaction distribution in the PEMFC cathode catalyst layer , 2005 .

[10]  Carbon nanotubes grown on different-sized rectangular patterns , 2004 .

[11]  Falin Chen,et al.  Effects of porosity change of gas diffuser on performance of proton exchange membrane fuel cell , 2003 .

[12]  J. Moreira.  Influence of the hydrophobic material content in the gas diffusion electrodes on the performance of a PEM fuel cell , 2003 .

[13]  S. Jiang,et al.  Fabrication and Performance of Polymer Electrolyte Fuel Cells by Self-Assembly of Pt Nanoparticles , 2005 .

[14]  P. Mu,et al.  Synthesis of platinum/multi-wall carbon nanotube catalysts , 2004 .

[15]  S. Jiang,et al.  Synthesis and characterization of platinum catalysts on multiwalled carbon nanotubes by intermittent microwave irradiation for fuel cell applications. , 2006, The journal of physical chemistry. B.

[16]  Chao-Yang Wang,et al.  Two-phase transport and the role of micro-porous layer in polymer electrolyte fuel cells , 2004 .

[17]  Chao-Yang Wang,et al.  Effects of hydrophobic polymer content in GDL on power performance of a PEM fuel cell , 2004 .

[18]  Jiujun Zhang,et al.  Micro-porous layer with composite carbon black for PEM fuel cells , 2006 .

[19]  J. P. Strakey,et al.  The U.S. Department of Energy, Office of Fossil Energy Stationary Fuel Cell Program , 2005 .

[20]  Jin Hyun Nam,et al.  Effective diffusivity and water-saturation distribution in single- and two-layer PEMFC diffusion medium , 2003 .

[21]  B. Yi,et al.  Microwave-assisted synthesis of PTFE/C nanocomposite for polymer electrolyte fuel cells , 2006 .

[22]  Jinsheng Xiao,et al.  Effects of porosity distribution variation on the liquid water flux through gas diffusion layers of PEM fuel cells , 2006 .

[23]  S. Jiang,et al.  Synthesis of PDDA–Pt nanoparticles for the self-assembly of electrode/Nafion membrane interface of polymer electrolyte fuel cells , 2006 .

[24]  E. Passalacqua,et al.  Influence of the PTFE content in the diffusion layer of low-Pt loading electrodes for polymer electrolyte fuel cells , 1998 .