Novel serpentine-baffle flow field design for proton exchange membrane fuel cells

An appropriate flow field in the bipolar plates of a fuel cell can effectively enhance the reactant transport rates and liquid water removal efficiency, improving cell performance. This paper proposes a novel serpentine-baffle flow field (SBFF) design to improve the cell performance compared to that for a conventional serpentine flow field (SFF). A three-dimensional model is used to analyze the reactant and product transport and the electrochemical reactions in the cell. The results show that at high operating voltages, the conventional design and the baffled design have the same performance, because the electrochemical rate is low and only a small amount of oxygen is consumed, so the oxygen transport rates for both designs are sufficient to maintain the reaction rates. However, at low operating voltages, the baffled design shows better performance than the conventional design. Analyses of the local transport phenomena in the cell indicate that the baffled design induces larger pressure differences between adjacent flow channels over the entire electrode surface than does the conventional design, enhancing under-rib convection through the electrode porous layer. The under-rib convection increases the mass transport rates of the reactants and products to and from the catalyst layer and reduces the amount of liquid water trapped in the porous electrode. The baffled design increases the limiting current density and improves the cell performance relative to conventional design.

[1]  Chao-Yang Wang,et al.  In situ water distribution measurements in a polymer electrolyte fuel cell , 2003 .

[2]  Rong Chen,et al.  Analysis of Mass Transport of Methanol at the Anode of a Direct Methanol Fuel Cell , 2006 .

[3]  W. Lehnert,et al.  Development of a stack having an optimized flow field structure with low cross transport effects , 2006 .

[4]  James Larminie,et al.  Fuel Cell Systems Explained , 2000 .

[5]  Sadik Kakac,et al.  Two‐dimensional model for proton exchange membrane fuel cells , 1998 .

[6]  Chao-Yang Wang,et al.  Model of Two-Phase Flow and Flooding Dynamics in Polymer Electrolyte Fuel Cells , 2005 .

[7]  Wei-Mon Yan,et al.  Numerical study of cell performance and local transport phenomena in PEM fuel cells with various flow channel area ratios , 2007 .

[8]  Chao-Yang Wang,et al.  Ultra large-scale simulation of polymer electrolyte fuel cells , 2006 .

[9]  Minkmas V. Williams,et al.  Influence of Convection Through Gas-Diffusion Layers on Limiting Current in PEM FCs Using a Serpentine Flow Field , 2004 .

[10]  Shanhai Ge,et al.  Water Management in PEMFCs Using Absorbent Wicks , 2004 .

[11]  T. Springer,et al.  Polymer Electrolyte Fuel Cell Model , 1991 .

[12]  Chao-Yang Wang,et al.  Electrochemical and flow characterization of a direct methanol fuel cell , 2004 .

[13]  Qiang Ye,et al.  The role of under-rib convection in mass transport of methanol through the serpentine flow field and its neighboring porous layer in a DMFC , 2006 .

[14]  Suresh G. Advani,et al.  On the relative influence of convection in serpentine flow fields of PEM fuel cells , 2006 .

[15]  Wei-Mon Yan,et al.  Reactant gas transport and cell performance of proton exchange membrane fuel cells with tapered flow field design , 2006 .

[16]  Jack S. Brenizer,et al.  Quantification of liquid water accumulation and distribution in a polymer electrolyte fuel cell using neutron imaging , 2006 .

[17]  Suk Won Cha,et al.  The scaling behavior of flow patterns: a model investigation , 2004 .

[18]  S. Patankar.  Numerical Heat Transfer and Fluid Flow , 2018, Lecture Notes in Mechanical Engineering.

[19]  Tianshou Zhao,et al.  A new flow field design for polymer electrolyte-based fuel cells , 2007 .

[20]  Wei-Mon Yan,et al.  Humidity of reactant fuel on the cell performance of PEM fuel cell with baffle-blocked flow field designs , 2006 .

[21]  T. Hatanaka,et al.  Measurement of Flooding in Gas Diffusion Layers of Polymer Electrolyte Fuel Cells with Conventional Flow Field , 2006 .

[22]  David L. Jacobson,et al.  In situ neutron imaging technique for evaluation of water management systems in operating PEM fuel cells , 2004 .

[23]  Wei-Mon Yan,et al.  Transient analysis of reactant gas transport and performance of PEM fuel cells , 2005 .

[24]  Qiang Ye,et al.  In situ visualization study of CO2 gas bubble behavior in DMFC anode flow fields , 2005 .

[25]  Chao-Yang Wang,et al.  Liquid Water Transport in Gas Diffusion Layer of Polymer Electrolyte Fuel Cells , 2004 .

[26]  T. Nguyen,et al.  Two-phase flow model of the cathode of PEM fuel cells using interdigitated flow fields , 2000 .

[27]  Trung Van Nguyen,et al.  A Gas Distributor Design for Proton‐Exchange‐Membrane Fuel Cells , 1996 .

[28]  Xianguo Li,et al.  Cross-leakage flow between adjacent flow channels in PEM fuel cells , 2006 .

[29]  Ay Su,et al.  Study of water-flooding behaviour in cathode channel of a transparent proton-exchange membrane fuel cell , 2006 .

[30]  Hung-Yi Li,et al.  Three-Dimensional Analysis of PEMFCs with Different Flow Channel Designs , 2006 .

[31]  M. Mench,et al.  Real-time water distribution in a polymer electrolyte fuel cell , 2005 .

[32]  Sandip Mazumder,et al.  Rigorous 3-D mathematical modeling of PEM fuel cells. II. Model predictions with liquid water transport , 2003 .

[33]  Suk Won Cha,et al.  Geometric scale effect of flow channels on performance of fuel cells , 2004 .

[34]  Xianguo Li,et al.  Review of bipolar plates in PEM fuel cells: Flow-field designs , 2005 .

[35]  Wei-Mon Yan,et al.  Analysis of reactant gas transport in a PEM fuel cell with partially blocked fuel flow channels , 2005 .

[36]  Trung Van Nguyen,et al.  Effect of Thickness and Hydrophobic Polymer Content of the Gas Diffusion Layer on Electrode Flooding Level in a PEMFC , 2005 .

[37]  Shou-Shing Hsieh,et al.  Characterization of the operational parameters of a H2/air micro PEMFC with different flow fields by impedance spectroscopy☆ , 2006 .

[38]  Wei-Mon Yan,et al.  Effects of baffle-blocked flow channel on reactant transport and cell performance of a proton exchange membrane fuel cell , 2005 .