Electrolyte-supported

D.A. Emery, P.H. Middleton, and I.S. Metcalfe, The effect of electrochemical current pumping on the work function of solid electrolyte supported catalysts, Surf. Sci. 405, 308-315(1998). 

Both questions have been recently addressed via a surface diffusion-reaction model developed and solved to describe the effect of electrochemical promotion on porous conductive catalyst films supported on solid electrolyte supports.23 The model accounts for the migration (backspillover) of promoting anionic, O5, species from the solid electrolyte onto the catalyst surface. The... 

As with other acute diarrheal illnesses, fluid and electrolyte support is a mainstay of therapy, mainly with ORT. 

FIGURE 2.13 (a) Maximum power and (b) cell total ohmic resistance (labeled as IR resistance ) and interfacial resistance (labeled as polarization ) at constant current density of 0.3 A/cm2 versus the volume percent of Ni in the Ni-YSZ cermet for electrolyte-supported cells with an active area of 2 cm2 operated at 1000°C. (From Koide, H. et al., Solid State Ionics, 132 253-260, 2000. Copyright by Elsevier, reproduced with permission.)... 

For electrolyte-supported cells, many studies indicate that anode resistance decreases significantly as anodic current passes through the anode. For example, van Herle et al. [55] found that anode resistance decreased dramatically from 2.4 to 0.5 and to 0.1 fl when the cell current increased from 0 to 95 and then to 567 mA (Figure 2.20). Similarly, Primdahl and Mogensen [39] studied the effect of anode overpotential on the anode interfacial conductance and found that the anode interfacial resistance decreased significantly as the anode overpotential increased, which was also verified by Jiang and Badwal [43],... 

The influence of porosity on the electrochemical activity has not been studied much for electrolyte-supported cells because anode pastes for electrolyte-supported cells are made for screen printing, and thus contain significant amounts of organics, which almost guarantees sufficient porosity. In addition, since the anode thickness for electrolyte-supported cells is only on the order of 50 pm, the concentration polarization itself becomes much less of an issue. In fact, Jiang et al. [44] showed that anode overpotential for cermet anodes prepared with extra graphite pore formers... 

FIGURE 2.25 Relative cell performance drop, AP=A(UI), versus H2S concentration in H2 for electrolyte-supported cells at different temperatures. (FromZha, S. etal., J. Electrochem. Soc., 154 B201-B206, 2007. Reproduced by permission of ECS-The Electrochemical Society.)... 

FIGURE 2.27 Change of total impedance spectra for an electrolyte-supported cell when it was poisoned by 10 ppm H2S under (a) different constant current densities, and (b) different constant cell voltage. (From Cheng, Z. et al., J. Power Sources, 172 688-693, 2007. Copyright by Elsevier, reproduced with permission.)... 

Electrolyte Support glass fiber paper PTFE-bonded SiC PTFE-bonded SiC... 

Electrolyte Support MgO mixture of a-, p-, and y-LiAI02 y-LiAI02, a-LiAI02... 

To illustrate typical simulation results from such multiphysics SOFC models, consider a co-flow and a cross-flow electrolyte-supported cell. The cross-flow geometry is of particular interest because of the complex transport phenomena offered in this cell configuration, a configuration able to provide detailed understanding of mass-transfer limitations. Structured, orthogonal meshes were used for all compu-... 

Figure 43. Calculated current—voltage characteristics and power density curve of electrolyte-supported co-flow SOFC at an operating temperature of 1000 °C and anode and cathode stoichiometry of 1.5 and 2.0 at 0.4 A/cm, respectively.

Figure 44. Geometry and mesh of a five-channel cross-flow electrolyte-supported SOFC.

Figure 45. Current distribution (A/m ) at a cell potential of 0.4 V in the five-channel cross-flow electrolyte-supported SOFC (A/m ) under anode and cathode stoichiometries of 1.5 and 2.0, respectively, and a cell temperature of 1000 °C.

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