Abstract
The modification of boron-doped diamond (BDD) electrodes with platinum oxide particles deposited by the Sol-gel method and using several pre- and post-treatments of the surface is described. The electrochemical stability of the resulting catalytic coatings was evaluated by cyclic voltammetry in acid medium and was much greater than those previously reported in the literature for others deposition methods. A thermal pre-treatment of the BDD surface yielded electrodes that retained 91.6% of the coated material after 1000 voltammetric cycles carried out between the water decomposition reactions. The application of a Nafion® film on top of the coating preserved integrally the deposited platinum oxide. The use of such modified electrodes for practical applications is now feasible under the present experimental conditions.
Highlights
The boron-doped diamond (BDD) electrode has been the object of intense research activity in recent years in electroanalytical studies[1,2,3,4] since it possesses extraordinary chemical stability, low capacitive currents in an extended range of potentials and good reproducibility for analytical studies if properly pretreated.[5]
It is well established in literature that the Sol-gel method is an excellent alternative for producing stable coatings on different surfaces and this has been used for different purposes
A micrograph recorded on the dark part of Figure 2a with a higher magnification (Figure 2b)
Summary
The boron-doped diamond (BDD) electrode has been the object of intense research activity in recent years in electroanalytical studies[1,2,3,4] since it possesses extraordinary chemical stability, low capacitive currents in an extended range of potentials and good reproducibility for analytical studies if properly pretreated.[5] Taking advantage of these qualities, several authors have used the BDD electrodes to study the complete oxidation or electrochemical combustion of organic compounds for wastewater treatment.[6,7,8] On the other hand, modifications of the diamond surfaces by metals or metal oxides have been proposed for a variety of applications and using different deposition methods. Awada et al.[9] have demonstrated that some metals such as Pt, Pb and Hg can be electrochemically deposited on the surface of conductive diamond thin films.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
