Screen printing, solid electrolytes

The heater, the underlayer, the zirconia solid electrolyte and the two electrodes are formed by screen printing and sintering. The sintering condition is at 1,U80°C for 2HR in air. The temperature of sensor surface rises to 600°C with plasma spraying. 

A commercially available fully dense Na "-(3"-alumina disc was used as the solid electrolyte. The working electrode (sink) of the system is a screen-printed platinum thick film of 7 pm in thickness. The porosity of the Pt thick film is in the range of 65 to 75 %, and the average pore size is about 2 pm and ranges from 0.5-5 pm according to microstructure studies. A source Na COj disc was made by pressing Na COg powder. The green body was then cosintered onto a Pt mesh with a spot-welded Pt lead. 

The PEVD sample utilized in this investigation is a solid electrochemical cell with a ytterbia and yttria stabilized zirconia pellet (8%Yb303-6%Y303-Zr03) as the solid electrolyte to conduct oxygen anions from the source to the sink side. A commercially available Pt thick film paste was screen printed on the center of both surfaces of the solid electrolyte disk. Two Pt meshes, with spot welded Pt leads,... 

Figure 3.29. Scanning electron microscope picture of the electrode-electrolyte structure along a perpendicular cut. Top screen-printed Lao.jSro 4CO0 FeogOj positive electrode. Middle spray-deposited electrolyte, YSZ = 8 mol% YjOg stabilised ZrOj. Bottom negative electrode, NiO and YSZ in ratio 7 3, in cermet CeOj. (From D. Perednis and L. Gauckler (2004). Solid oxide fuel cells with electrolytes prepared via spray pyrolysis. Solid State Ionics 166,229-239. Reprinted by permission from Elsevier.)...

D. (2003) CO2 solid electrolyte sensor with screen printing, 48th Internationales WissenschafUiches Kolloquium, Technische Universitat, llmenau, pp. 13-14,... 

A decrease in the current density for sintering temperatures above 1250 °C could be explained by the increased formation of a solid solution between the 8YSZ electrolyte and the CGO layer, whereas a decrease in power densities at sintering temperatures lower than the optimum could be explained by lower adherence of the diffusion barrier layer. Finally, cells with an optimized CGO diffusion barrier and LSC(F) cathode layer achieved current densities of about 2.3 A cm at 800 °C and 700 mV. This type of cell is denoted at FZJ as the state-of-the-art cell with an LSC(F) cathode. Table 9.3 shows the characteristics of these state-of-the-art cells with a screen-printed CGO diffusion barrier layer and with an L58SCF-type cathode. 

Mechanical procedures. An electrode of a suitable shape and material, e.g., a fine mesh, can be pressed, under ambient or elevated temperature, onto the surface of a membrane, or a wire can be tightly wound around a solid or polymer electrolyte tube. Screen printing is also a mechanical procedure for depositing material from an ink onto a surface. 

Chou, C.H., Chang, J.L. and Zen, J.M. (2010) Effective analysis of gaseous formaldehyde based on a platinum-deposited screen-printed edge band ultramicroelectrode coated with Nafion as solid polymer electrolyte. Sens. Actoators, B, 147,669. 

Thick-Film Solid Electrolytes 19.5.2.1 Screen Printing... 

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