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Keywords: current density
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Journal Articles
Article Type: Research-Article
J. Electrochem. En. Conv. Stor. August 2015, 12(4): 041008.
Paper No: FC-13-1114
Published Online: September 18, 2015
... received August 28, 2015; published online September 18, 2015. Editor: Wilson K. S. Chiu. 27 11 2013 28 08 2015 PEMFC hydrogen pressure pulsation feed current density effective diffusivity To a certain extent, the performance of the PEMFC in anodic dead-end mode can...
Journal Articles
Article Type: Research-Article
J. Electrochem. En. Conv. Stor. December 2013, 10(6): 061007.
Paper No: FC-12-1015
Published Online: September 17, 2013
... cells (PEMFCs). Effects on the current density, temperature difference, and water content have been simulated and analyzed, respectively, with conventional and interdigitated flow field when the humidification in the anode or cathode is from 25% to 100%, respectively. The numerical results show...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. February 2012, 9(1): 011006.
Published Online: December 19, 2011
... specific resistance measurements. It was observed that MEAs with lower gas flow rate had lesser cell resistance compared to MEAs with a higher gas flow rate. Tafel plot shows the highest exchange current density value of 10 − 2.05 mA cm 2 for MEA with 0.5 mg/cm 2 catalyst loading tested at reactant gas...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. February 2012, 9(1): 011001.
Published Online: December 15, 2011
...Markus J. Heneka; Ellen Ivers-Tiffée In this contribution, the performance of solid oxide fuel cells (SOFC) under high current density load cycles is studied by means of electrical measurements and material analyses. Our study is an important premise for the application of accelerated life testing...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. December 2011, 8(6): 061019.
Published Online: October 3, 2011
... was the current density and temperature profile across the MT-SOFC that was strongly dependent on the distance from the hydrogen/fuel inlet. Not only was the model validated but also a grid and quantitative solution analysis is explicitly shown and discussed. This resulted in the optimum grid density...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. June 2011, 8(3): 031002.
Published Online: February 15, 2011
...-dimensional, simultaneous, partial differential equations of mass, energy, and electrochemistry and neglecting the stack direction variation effect, is developed. The results show that the fuel utilization increases with a decrease in the molar flow rate, and the average current density decreases when...
Journal Articles
Article Type: Technical Briefs
J. Electrochem. En. Conv. Stor. December 2010, 7(6): 064502.
Published Online: August 20, 2010
... of the major performance limiting conditions. A pseudo-two-dimensional analytical model is developed to predict the inception of two-phase flow along the length of the cathode channel. The diffusion of the water is considered to take place only across the gas diffusion layer (GDL). The current density...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. October 2010, 7(5): 051015.
Published Online: July 20, 2010
... Laboratory (PNNL). The activation overpotential was investigated through the exchange current density term, which is dependent on the cathode activation energy, the cathode porosity, and the pore size and grain size at the cathode triple phase boundary. The cathode pore size, grain size, and porosity were...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. October 2010, 7(5): 051010.
Published Online: July 16, 2010
... of polymer electrolyte membrane fuel cell stacks, and more particularly, on the current distribution along the cell. The oxygen concentration decreases along the channel and induces a change in the local electrochemical response; it means that the local current density on the cell is redistributed...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. August 2010, 7(4): 041004.
Published Online: April 6, 2010
... variables are cell humidity, pure oxygen or air as oxidizer, and current density. Three groups of single cells were tested: a graphite cell, a stainless steel cell (treated and original), and a thin, small, treated stainless steel cell. A treated cell here means using an electrochemical treatment to improve...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. August 2010, 7(4): 041002.
Published Online: April 5, 2010
..., current density and power density were analyzed. The simulations showed that the oxygen concentration in the catalyst layer increases with increasing Reynolds number and hence the current density and power density of the PEM fuel cell also increases. Analysis of the data obtained from simulations also...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. June 2010, 7(3): 031010.
Published Online: March 11, 2010
... locations in the stack. The ac impedance analysis, also known as electrochemical impedance analysis, showed low frequency inductive effects and mass transport losses due to liquid water accumulation at high current densities. Results show that the stack run time to achieve steady state for impedance...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. June 2010, 7(3): 031001.
Published Online: March 9, 2010
...). At a simulated high current density situation the flow field was mapped on a 70 cell simulated cathode manifold. Three different inlet configurations were tested: plug flow, circular inlet, and a diffuser inlet. A very distinct jet was formed in the manifold, when using the circular inlet configuration, which...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. April 2010, 7(2): 021011.
Published Online: January 11, 2010
...S. H. Kim; K. B. Shim; C. S. Kim; J. T. Chou; T. Oshima; Y. Shiratori; K. Ito; K. Sasaki The influence of water vapor in air on power generation characteristic of solid oxide fuel cells was analyzed by measuring cell voltage at a constant current density, as a function of water vapor concentration...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041010.
Published Online: August 14, 2009
... and testing. Low in-plane resistance is extremely important for the ribbon architecture because high in-plane GDL resistance can cause significant variation in current density over the catalyzed area. To reduce the current variation the new GDLs are fabricated with materials that have reduced in-plane...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041005.
Published Online: August 11, 2009
... transfer analysis based on the deformed GDL geometry and modified parameters with the microscale electrical contact resistance analysis. The modeling results reveal that higher assembly pressure increases cell resistance to gas mass transfer, causes an uneven current density distribution, and reduces...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. November 2009, 6(4): 041003.
Published Online: August 11, 2009
... flow, mass transport, and electrochemistry are examined. Detailed electrochemical/mass characteristics, such as flow velocities, species mass fraction, species flux, and current density distributions are presented. These details provide a solid basis for optimizing the geometry of a PEM fuel cell stack...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. August 2009, 6(3): 031002.
Published Online: May 11, 2009
... with a uniform electrolyte current density distribution to make the most efficient use of the available space and possibly to help minimize the onset of cell component degradation. Predicting the electrolyte current density distribution requires an understanding of the many physical and electrochemical processes...
Journal Articles
Article Type: Research Papers
J. Electrochem. En. Conv. Stor. May 2009, 6(2): 021012.
Published Online: February 26, 2009
...H. Lustfeld; M. Reißel; U. Schmidt; B. Steffen In this paper the tomographic problem arising in the diagnostics of a fuel cell is discussed. This is concerned with how well the electric current density j ( r ) be reconstructed by measuring its external magnetic field. We show that (i) exploiting...
Journal Articles
Article Type: Technical Briefs
J. Electrochem. En. Conv. Stor. May 2009, 6(2): 024502.
Published Online: February 25, 2009
... of hydrogen (oxygen) in catalytic interface of anode (cathode), and current density are considered in this modeling method. These parameters are adjustable and present a good solution to predict output voltage, efficiency, and output power of the PEMFC. 02 06 2007 08 12 2007 25 02 2009...