Pt mesh

Fig. 28 Reductive electrochemistry data for (72). Cyclic voltammetric curves for a 0.1-mM CH2CI2 solution of (72) at 100 mV s , glassy carbon as a working electrode, Pt-mesh as a counter electrode, and a Ag wire as a quasi-reference electrode, T = 25 °C, TBAPFs (0.1 M) was used as supporting electrolyte.

Look up the formula for the area of a parallelogram and calculate the area per mole, assuming one molecule per unit mesh. Compare this area with the Pt(lll) unit mesh for which the dimensions are also given. Do the data make any more sense if it is assumed that some of these alkanes form surface structures with two molecules per unit mesh Prepare a plot of the area per molecule versus the number of carbon atoms in the chain. Criticize or defend the following proposition The amount of free area per unit mesh in these packings is equivalent to one Pt mesh. 

Polycrystalline yttria-stabilized zirconia (YSZ-8) disks were prepared using 8 mol % Y203-doped zirconia powder (TOSOH zirconia, TZ-8Y, TOSOH Corp.). The powder was pressed uniaxially into disks which were cold isostatically pressed at 40,000 psi and then sintered at 1450°C for 4 h. Pt paste (Engelhard 6926) was painted on both faces of the YSZ-8 disks. Pt wires (0.0025 cm diam) were connected to the YSZ by using Pt meshes (150 X 150 mesh, 0.005 cm wire diam, Unique Wire Weaving Co., Inc.). 

Apparatus Cyclic voltammetry and amperometric current-time curves were obtained with a Pine Instrument Inc., Model RDE4 bipotentiostat and Kipp Zonen BD 91 XYY recorder equipped with a time base module. All measurements were performed in a conventional single-compartment cell with a saturated calomel electrode as the reference electrode and a Pt mesh as the auxiliary electrode at room temperature. Chronoamperometry was made with EG G Princeton Applied Research potentiostat/galvanostat Model 273 equipped with Model 270 Electrochemical Analysis Software. 

Fig. 13.7 Linear sweep voltammograms for electrochemical HDH of pentachlorophenol (PCP) and 2,4-dichlorophenol (DCP) on a Ti mesh-supported Pd cathode (2mgPdcm-2, 4cm2). Cell H-cell divided by a Nation 117 membrane. Anode Pt mesh (lOcm2). Catholyte 0.05MNa2S04 (pH 3) solution without (blank) or with saturated PCP and DCP. Anolyte 0.05 M Na2S04 (pH 3) solution. Scan rate 5 mV s-1. Temperature 21.5 0.5°C...

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,... 

The PEVD system used in this investigation is schematically shown in Eigure 36. A Na -p/ P -alumina disc, 16 mm in diameter and 5 mm in thickness, was used as the solid electrolyte with a working electrode on one side and both counter and reference electrodes on the other. To simplify data interpretation, the same electrode material, a Pt thick film, was used for all three electrodes, so the measured potential difference could be directly related to the average inner potential difference between the working and reference electrode. In order to make good electrical and mechanical contact, Pt meshes, with spot-welded Pt wires, were sintered on the Pt thick films as electron collectors and suppliers. 

Fig. 24, Specific capacitance Cs vs. specific area As of carbon black single electrodes , , precompacted c.b. electrodes ppp = 440 MPa Pt mesh contact in 10 m H2SO4 ( ) and 3 m H2SO4 ( ) [33] A, c.b. in aprotic electrolyte, 1 m LiCFsSOs in PC [249] --, theoretical line, Ca,dl = 20 pF/cm ...

Figure 2.11 Plot showing the influence of the presence and absence of heterotropic ligands for various hemoglobins, n, as defined in Figure 2.4, plotted as a function of the midpoint potential for 7, Hb Aq in 0.05 M MOPS, 0.2 M NaNOs, and 0.25-0.6 mM IHP (in excess over [heme] which varied from 0.1 to 0.23 mM) 2, Hb Aq in 0.05 M MOPS, 0.2 M NaNOs 5, Trout I Hb in 0.05 M MOPS, 0.2 M NaN03 4, Hb Aq in 0.2 M MOPS 5, Hb Tq in 0.05 M MOPS 6, HbCPA in 0.05 M MOPS, 0.2 M NaNOs, and 0.25-0.6mM IHP (in excess over [heme]) 7, HbCPA in 0.05 M MOPS, 0.2 M NaNOs 5, HbCPA in 0.2 M MOPS 9, hMb in 0.05 M MOPS, 0.2 M NaN03. Additional conditions Pt mesh electrode [Ru(NH3)6Cl3] = 0.30-1.1 mM [heme] = 0.1-0.23 mM pH 7 20 °C. HbCPA is carboxypep-tidase digested Hb. Figure adapted from ref 26 and used with permission.

Figure 2.12 Plot of F1/2 for Hb as a function of imidazole concentration that illustrates the influence of homotropic effector equilibrium reaction 14 on the ease of reduetion and level of cooperativity (inset). Parameters obtained by spectroelectrochemistry max is defined in Figure 2.4. Conditions Pt mesh electrode [heme] = 0.1-0.23 mM [Ru(NH3)6Cl3] = 0.30-1.1 mM [NaN03] = 200mM [MOPS] = 50 mM at pH 7.1 20 °C. Figure adapted from ref. 11 and used with permission.

Counter electrode Pt mesh separated from bulk solution reference electrode Ag/AgNOs (0- CH3CN working electrode Pt mesh supporting electrolyte KNO3 solvent Me2SO. 

The procedure involves placing a solid salt in a Pt (platinum) beaker and bringing it up to the required temperature. The salt crystals liquefy and the SiC sample to be etched is placed in a Pt mesh basket and is then lowered into the molten salt for the required time. All of the molten salts to be used for this procedure need oxygen for etching [1]. The oxygen can be supplied by the molten salt, as in the case of KOH, or by the surrounding atmosphere. The following molten salts have been used to etch SiC and reveal various surface features ... 

Catalysts were characterised by cyclic voltammetry using a two compartment electrochemical cell. The working electrode consisted of a Pt-mesh basket containing... 

The working electrode should have a large surface area. Platinum is used because it is inert Pt gauze or mesh electrodes are used to provide a large surface area. The electrode mesh is like wire window-screening material, with the wire diameter about 0.2 mm. The mesh is welded into an open cylinder to make the electrode. A standard size is a cylinder about 5 mm high and 5 mm in diameter, but Pt mesh electrodes of many sizes are available. 

The droplet cell. Fig. 2(d), has uniform current distribution and shrunken dimensions that allow resistive electrolytes to be used [5]. This approach was developed for the use of pure water as an electrolyte as a means to mimic atmospheric corrosion, but it can be used with any electrolyte. An area of a flat sample is exposed through a hole in a piece of protective tape. Electroplater s tape is a very resistant tape with good adhesion that is useful for this and other masking applications in corrosion. If the hole in the tape is made with a round punch, the same punch can be used to make circular dots from pieces of filter paper. One such dot is placed securely into the exposed hole. A small (typically 10-20 gl) droplet of soluhon is placed on the filter paper using a calibrated pipette. This wet filter paper acts as the electrolyte. A piece of woven Pt mesh is placed on top of the wet filter paper, and a reference electrode is held against the back of the Pt counterelectrode. As mentioned, the small dimensions allow the use of even very pure water. This simulates atmospheric corrosion, in which a thin water layer forms on the surface. As in atmospheric corrosion, soluble species on the sample surface and pollutant gases in the air are dissolved into the water droplet, which provides some conductivity. This technique has been used... 

Numerous metal and alloy coatings can be prepared by electrodeposition and are suitable for nano-plating technologies, including Ag, Au, Cd, Co, Cr, Cu, Fe, Ni, Pt, Sn, Zn, and most alloys of the listed metals [7], Either a fairly inert counter electrode, such as a Pt mesh, a carbon rod, or a plate of the metal to be plated are used. In the latter case, the zero valent metal of the anode is oxidized and dissolved at the same rate as metal ions are reduced a the working electrode. In this manner, the cations concentration of the electrolyte bath is continuously replenished. In industrial applications usually a galvanostatic is favored over a potentiostatic deposition technique. 

Graphite felt One-step electrosynthesis Pt mesh Shewanella Dual-chamber Lactate P.D. = 166mW 114... 

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