Tiron electrode

It is known that deposition on substrates where nonconductive metal oxide layers are formed at positive potentials is difficult. This includes electrodes made of stainless steel, tantalum, and aluminum. However, the rate of oxide formation is important because we have shown that stainless steel is an ideal substrate for deposition of some PPy s. The rate of oxide formation depends on the solution and the electrochemical conditions employed. If the polymer can deposit before the onset of metal oxide formation, then consistent films of excellent quality can be deposited. This is aptly demonstrated with the successful electrocoating of aluminum when the electrocatalyst Tiron 4 is used. 

Fig. 4 a The mechanism of the redox reaction of 4,5-dihydroxybenzene-13-disulfonic acid, b Electrolytic characterization of tiron in 3 M H2SO4 at 298 K with a lead counter electrode [62]. Reproduced with permission. Cop5uight 2010 Electrochimica Acta... 

Mediated oxidation of tiron at a Nafion-Fe(bipy)3 coated electrode... 

Figure 11. Rotating-disc current-potential curves recorded at a scan-rate of 5 mV-s "i and w 160 rpm for the oxidation of tiron at an EPG-Nation Fe bipy)3 electrode. The limiting current for the oxidation of tiron (1.00 mM) at the uncoated electrode was 101 mA.

Figure 13. Plot of it vs. Cs for the oxidation of tiron at an EPG-Nafion Fe(bipy)3 electrode. 

---