Gold deposition from electrochemical cell

Fig. 49. A schematic to illustrate the basic concept of the deposition process, a The insulated tip serves as the counter electrode and the substrate serves as the working electrode in the electrochemical cell, b A small amount of polymer will be directly polymerised onto the substrate following a single high voltage pulse.c An STM image of the word science , which was written by polymerising polypyrole directly onto a gold surface. The size of the polymer dots are 5-10 nm across. Reproduced from [453]...

Ultrasound was also applied for short periods of time to prevent the temperature of the solution in the electrochemical cell from rising above room temperature (T = 25 5 °C) during gold deposition/stripping and gold colloid formation [48]. 

Platinum chemically deposited on a Nafion membrane was used as a platinum SPE (Solid Polymer Electrolyte) electrode. The electrochemical measurements were performed using the half cell shown in Fig. 2-2. The cell body is made from Teflon (PTFE). The cell is divided into two compartments one for backside gas supply one for the electrolyte. SPE electrodes are placed between them with the deposited side facing the gas compartment. A gold foil with a hole was placed behind the SPE electrode... 

Electrodeposition of Pa metal has been performed from both aqueous and nonaqueous solutions. An isopropanol solution of 10-20 p,gmL Pa from 8M HCl/0.01 M HE/Pa stock was employed for quantitative electrodeposition [41]. The cell consisted of a gold-plated A1 cathode and a Pt wire anode. During deposition the current was maintained at 1 mA, which produced a potential of 400-600 V during the 90-min electrolysis. The progress of the electrolysis was externally monitored by alpha-counting of the electrolysis solution before and during the electrodeposition. Deposition studies of metal from aqueous solutions are more common. Pa was electrodeposited on platinum in 95% yield at tracer concentrations from an electrolyte of [NH4]C1/HC1 [42]. Electrochemical and chemical conditions of the plating process were described for Pu solutions, which served as a model for the other actinide elements studied. Another tracer... 

Figure 5 Cells for EQCM measurements (1) quartz ciy stal, (2) gold eleetrodes deposited on both sides of the quartz crystal, (3) counter electrode, (4) reference electrode, (5) solution, (6) polyethylene body, (7) glass cell parts, (8) O rings, (9) electrical contacts for the working electrode, (10) glass tube. Reprinted with copyright from The Electrochemical Society Inc.

---