Nickel mesh

Recently, Tachibana et al. [19] used a nickel mesh electrode containing a mixture of Teflon emulsion, graphite (or... 

All AB, alloys are very brittle and are pulverized to fine particles in the hydrid-ing-dehydriding process (see Sec. 7.2.1). Thus electrodes must be designed to accommodate fine powders as the active material. There are several methods of electrode fabrication Sakai et al [35] pulverize the alloy by subjecting it to several hydrogen absorption-desorption cycles, before coating the resulting particles with Ni by chemical plating. The powder is mixed with a Teflon dispersion to obtain a paste which is finally roller-pressed to a sheet and then hot-pressed to an expanded nickel mesh. The fabrication of a simple paste electrode suitable for laboratory studies is reported by Petrov et al. [37],... 

The impregnation of porous nickel discs with CoPc was difficult because of the limited solubility of the chelate in the usual solvents. CoPc cathodes with carbon as substrate were therefore prepared for use in H2/O2 fuel cells. A mixture of 72 mg CoPc and 48 mg acetylene black, with PTFE as binder, was pressed into a nickel mesh of area 5 cm2. Electrodes of this type were tested in an H2/O2 fuel cell with 35% KOH electrolyte in an asbestos matrix at 80° C. Figure 5 compares the current/voltage characteristics of CoPc cathodes (14 mg/cm2) with those of other catalysts, including platinum (9 mg/cm2), silver (40 mg/cm2), and pure acetylene black (20 mg/cm2). An hydrogen electrode (9 mg Pt/cm2) was used as the anode in all tests. To facilitate comparison of the activity of different cathodes, the pure ohmic internal resistance of the cells (of the order of 0.02 ohm) was eliminated. 

A GDL is also an important component of the AFC. For these fuel cells, the GDLs are usually made by a rolling procedure similar to that used in the paper industry. The activated carbon/PTFE mixture is rolled onto a current collector made of planar nickel mesh. By using GDL and a two-layer electrode structure, the Pt loading in the AFC can be reduced to 0.3 mg cm-2 [76],... 

Figure 4.32 Nickel mesh (a) photograph of complete mesh showing frame and struts, (b) Scanning electron micrograph of mesh pores (by courtesy of Royal Society of Chemistry) [270],...

The catalysts used in the gas diffusion electrodes for oxygen reduction are from the Pt-group, including this metal itself or rhodium compounds. They are for instance incorporated into graphitized carbon or acetylene black. Binding material is a perfluorinated copolymer (Nafion). The conducting material necessary in the gas diffusion setup is represented by steel or nickel mesh, in some cases silver-plated for better withstanding the 32 wt% caustic alkali. 

SEMs of the molybdenum mask (Type B) and the nickel mesh (Type C) used in the experiments. The Ni mesh was also used as a spacer of thickness 4.5pm and flexible enough to be folded over several times for spacer thickness to be increased in small increments. Mask Type A (not shown) was identical to Type B, except the aperture that had a cylindrical profile with straight walls, and not the biconical ones of Type A. 

Figure 12.9 Quadrant manifold channel with mesh (a) and photographs of complete nickel mesh (b) and mesh pore (c). Reproduced by permission of the Royal Society of Chemist7[31].

Reactor R2 is also based on the film contacting principle. It depicts two cavities of ca. 100 pL separated by a nickel mesh with openings of 3-5 pm. The total gas-liquid interface is thus ca. 2000 m In contrast to Rl, the liquid film is not gravity but... 

CATALYST LAYER SUPPORTED BY A NICKEL MESH SCREEN... 

To determine whether the species introduced on doping carry spin, in situ ESR measurements were conducted during doping in parallel with optical measurements. The P3MT film sample (approximately 2 jj.m in thickness) on the ITO substrate was mounted in electrochemical cells as described by Chen et al. [233,236]. The P3MT sample, electrolytic solution, and counter electrode (lithium metal) sandwiched with nickel mesh (which is inert to the electrochemical reaction) were assembled in an inert atmosphere inside an ESR quartz tube. To avoid having the lithium metal and nickel mesh inside the ESR apparatus cavity, the... 

The second most used material is nickel oxide which is processed from nickel ore and used for the anode substrate and anode together with yttrium-stabilized zirkonia in form of a cermet and as a nickel mesh for the anode contact layer. Yttrium-stabilized zirconia is produced from rare earths and mineral sands. 

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