Coplanar electrode thickness

In 2009, Wei et al. reported a star-shaped stack comprised of four Ni-YSZIYSZILSM cells [21], This stack generated an OCV of approximately 3.5 V and a peak power output of 421 mW in a methane-air mixture feed at 700 °C. They concluded that the symmetric design can ensure the identical operation of each cell. On the other hand, as described in the previous section, SC-SOFCs allows for a coplanar electrode arrangement, where the two electrodes reside on the same surface of the electrolyte. Also in 2009, Kuhn et al. fabricated cells with one, two, three, four, five and ten pairs of electrodes with a width of 260 pm, thickness of 17 pm, and interelectrode gap of 114 pm [22]. The OCV roughly increased with increasing number of the electrode lines, although the maximum OCV value was as low as 0.8 V. 

J.T. Waber and B. Fogan, Mathematical Studies on Galvanic Corrosion ly Influence of Electrolyte Thickness on The Potential and Current Distributions of Coplanar Electrodes using Polarization Parameters, Journal of Electrochemical Society, vol. 103, pp. 64-72, 1956. 

Low-density polyethylene (LDPE) foils are cleaned with dichloromethane to remove the impurities. The foils are then activated, imder dynamic conditions at atmospheric pressure and room temperature, with diffuse coplanar surface barrier discharge equipment. The treatment is carried out for 15 s under an air atmosphere using a 200 W power supply. Plasma is generated by two parallel banded system of electrodes (1 mm wide, 50 micron thick, with 0.5 mm spacing between the strips, made of silver-paste) embedded in 96% aluminium oxide of high purity, while the electrodes are supplied with a high frequency sinusoidal voltage (-15 kHz, Um 10 kV). 

Figure 17.2 (a) Top-gate, staggered contact TFT architecture and (b) bottom-gate, coplanar contact TFT architecture, where (1) is the gate electrode, (2) is the dielectric (typical thickness = 100-500 nm), (3) is the organic semiconductor (typical thickness = 20-100 nm), (4) are the source and drain electrodes (channel length = 1-100 fj,m, channel width = 10-500 nm) and (5) is the substrate... 

Viscoelastic inks for direct-write microfabrication of single-chamber micro solid oxide fuel cells with coplanar thick electrodes. Mater. Res. Soc. Symp. Proc., 1179, 111-116. 

The main advantage of the coplanar fuel cell design is the possibility of considerably reducing the internal ohmic resistance of the cell, which is due primarily to the ohmic resistauce of the electrolyte. To decrease the ohmic resistance of conventional MEAs it is necessary to reduce the thickness of the electrolyte. An excessive reduction of this thickness can have detrimental consequences the formation of cracks and pinholes and the loss of stability and gas-tighmess. In strip cells the ohmic resistance is determined by the width of the gap between cathodes and anodes and can be decreased simply by narrowing this gap. If the electrodes are micropattemed to be close together, the cell s power density can be increased considerably. 

Figure 9.27 shows the transient photocurrent, measured at a photon energy of hv = 2.0 eV and at room temperature, in a C60 film for different levels of oxygen contamination [43]. Measurements are performed in a 0.5 pm thick film, with top coplanar Au electrodes, at an applied electric field of 10 V/cm, using laser pulses having a width of 20-30 ps and an intensity of 2—3 pJ. The overall temporal resolution of the measurements is about 50 ps. Each decay in Figure 9.27 consists of a short and a long-lived component. 

Figure 14.4 Fabricated elastomeric coplanar waveguides utilizing 3- am-thick gold layers (a) Electron micrograph of microcracked morphology, (b) atomic force microscope scan showing surface microcracks, and (c) 40-mm-long gold CPW electrodes (with dimensions as shown in Figure 14.3) remain conductive when flexed as shown.

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