Experimentalstudy on porouscurrentcollectors of PEMelectrolyzers

Abstract Experimental study on proton exchange membrane (PEM) electrolyzer was carried out focusing on the effect of pore structural properties of current collectors, such as porosity and pore diameter. Various titanium (Ti)-felt substrates with different porosities and pore diameters (measured by capillary flow porometry) were used as the anode current collector. Results show that when the mean pore diameter of the current collector was larger than 10 μm, the electrolysis performance improved with decreasing pore diameter. In contrast, changes in porosity had no significant effect on the cell performance when the porosity exceeded 0.50. The flow pattern of two-phase flow in the flow channel was discussed in terms of its relationship to bubble size and to pore diameter of the current collector. Finally, correlation between the calculated membrane resistance and the measured pore diameter of the current collectors suggest that larger bubbles generated from larger pores tend to become long bubbles in the channel, thus hindering the water supply to the membrane.

[1]  Claude Etievant,et al.  GenHyPEM: A research program on PEM water electrolysis supported by the European Commission , 2009 .

[2]  Keith Scott,et al.  Carbon dioxide evolution patterns in direct methanol fuel cells , 1999 .

[3]  T. Hibiki,et al.  Some characteristics of air-water two-phase flow in small diameter vertical tubes , 1996 .

[4]  A. J. Peters,et al.  A semiempirical study of the temperature dependence of the anode charge transfer coefficient of a 6 kW PEM electrolyzer , 2008 .

[5]  Keith Scott,et al.  Gas evolution and power performance in direct methanol fuel cells , 1999 .

[6]  T. Springer,et al.  Water Uptake by and Transport Through Nafion® 117 Membranes , 1993 .

[7]  H. Takenaka,et al.  Properties of Nafion membranes under PEM water electrolysis conditions , 2011 .

[8]  C. Bowen,et al.  The Thermodynamics of Aqueous Water Electrolysis , 1980 .

[9]  Chih-Ming Ho,et al.  Transport of bubbles in square microchannels , 2002 .

[10]  Gordon L. Nelson,et al.  Conductivity and Water Uptake of Aromatic‐Based Proton Exchange Membrane Electrolytes , 2000 .

[11]  R. Martínez-Béjar,et al.  Optimized photovoltaic generator–water electrolyser coupling through a controlled DC–DC converter , 2008 .

[12]  Tianshou Zhao,et al.  Gas–liquid two-phase flow regimes in rectangular channels with mini/micro gaps , 1999 .

[13]  F. Barbir.  PEM electrolysis for production of hydrogen from renewable energy sources , 2005 .

[14]  Yasuo Hasegawa,et al.  Effect of flow regime of circulating water on a proton exchange membrane electrolyzer , 2010 .

[15]  A. Parthasarathy,et al.  Temperature Dependence of the Electrode Kinetics of Oxygen Reduction at the Platinum/Nafion® Interface—A Microelectrode Investigation , 1992 .

[16]  Keith Scott,et al.  Electrochemical and gas evolution characteristics of direct methanol fuel cells with stainless steel mesh flow beds , 2001 .

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

[18]  Srinivas Garimella,et al.  Characterization of two-phase flow patterns in small diameter round and rectangular tubes , 1999 .

[19]  Tetsuya Yoshida,et al.  Effect of titanium powder loading in gas diffusion layer of a polymer electrolyte unitized reversible fuel cell , 2012 .

[20]  Tianshou Zhao,et al.  Effect of anode flow field design on the performance of liquid feed direct methanol fuel cells , 2005 .

[21]  Said I. Abdel-Khalik,et al.  Gas–liquid two-phase flow in microchannels Part I: two-phase flow patterns , 1999 .

[22]  Tohru Fukano,et al.  Fundamental data on the gas–liquid two-phase flow in minichannels , 2007 .

[23]  D. Bessarabov,et al.  A simple model for solid polymer electrolyte (SPE) water electrolysis , 2004 .

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

[25]  H. No,et al.  Investigation of bubble flow developments and its transition based on the instability of void fraction waves , 1995 .

[26]  Qiang Ye,et al.  Transient Capillary Blocking in the Flow Field of a Micro-DMFC and Its Effect on Cell Performance , 2005 .

[27]  T. Karayiannis,et al.  The effect of tube diameter on vertical two-phase flow regimes in small tubes , 2006 .

[28]  Prediction of production power for high-pressure hydrogen by high-pressure water electrolysis , 2004 .

[29]  Marc Doyle,et al.  Relationship between ionic conductivity of perfluorinated ionomeric membranes and nonaqueous solvent properties , 2001 .

[30]  R. García‐Valverde,et al.  Optimized method for photovoltaic-water electrolyser direct coupling , 2011 .

[31]  Muhammad Akbar,et al.  On gas–liquid two-phase flow regimes in microchannels , 2003 .

[32]  Yasuo Hasegawa,et al.  Influence of properties of gas diffusion layers on the performance of polymer electrolyte-based unit , 2011 .

[33]  Tianshou Zhao,et al.  Co-current air–water two-phase flow patterns in vertical triangular microchannels , 2001 .

[34]  Jian Zhang,et al.  The influence of anode gas diffusion layer on the performance of low-temperature DMFC , 2007 .

[35]  A. Kawahara,et al.  Investigation of two-phase flow pattern, void fraction and pressure drop in a microchannel , 2002 .

[36]  Qiang Liao,et al.  Visualization study on the dynamics of CO2 bubbles in anode channels and performance of a DMFC , 2007 .

[37]  Pierre Millet,et al.  Optimization of porous current collectors for PEM water electrolysers , 2009 .

[38]  A. Jena,et al.  An innovative technique for pore structure analysis of fuel cell and battery components using flow porometry , 2001 .

[39]  G. Wallis.  One Dimensional Two-Phase Flow , 1969 .

[40]  Everett B. Anderson,et al.  Research Advances towards Low Cost, High Efficiency PEM Electrolysis , 2010, ECS Transactions.

[41]  Theocharis Tsoutsos,et al.  Integration of hydrogen energy technologies in stand-alone power systems analysis of the current potential for applications , 2006 .

[42]  T. Zhao,et al.  Taylor bubbles in miniaturized circular and noncircular channels , 2001 .

[43]  M Momirlan,et al.  Current status of hydrogen energy , 2002 .

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

[45]  Toshiaki Konomi,et al.  Microporous layer coated gas diffusion layers for enhanced performance of polymer electrolyte fuel cells , 2010 .

[46]  R. V. A. Oliemans,et al.  Influence of bubble size on the transition from low-Re bubbly flow to slug flow in a vertical pipe , 2002 .