Figures index : Electrochemical Synthesis of Coin Metal Nanoparticles in School Chemistry Education : Science and Education Publishing

Figures index

World Journal of Chemical Education. 2018, 6(1), 72-77 doi:10.12691/wjce-6-1-11

Figure 1. Model for the processes during the synthesis of the nanoparticles on the particle level. A: Due to the high cathodic potential at the metal electrode the water is reduced at the phase transition, resulting in an anhydrous layer around the electrode. B: The metal of the electrode along with the cations of the electrolyte form the anionic metal species. The latter are oxidized to elementary metal by water in C and D. E: The generated nanoparticles are released from the electrode

Figure 2. Gas evolution at a gold wire electrode immediately after turning on the voltage source. While a stream of gas is flowing upwards from the gold wire (left), only a weak gas evolution can be observed at the graphite electrode (right)

Figure 3. Reaction product of a cathodic corrosion using a copper electrode. A brown suspension can be observed, scattering the light of a laser beam

Figure 4. SEM images of the resulting nanoparticles (A and B) as well as the surface of a silver wire before (C) and after the electrochemical treatment (D)

Figure 5. Reaction process of the gas evolution after adding concentrated hydrogen peroxide solution to a platinum nanoparticle dispersion.

Figure 6. Comparison of the gas evolution between an electrochemically treated (A left, B) and an untreated gold wire (A right, C).

Figure 7. Platinum catalyzed chemiluminescence of lucigenin (photographic exposure time: 30 seconds).