Enhanced Activity for Methanol Oxidation of Platinum Particles Supported on Iridium Oxide Modified Boron‐Doped Diamond Powder
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2017-04-05 |
| Journal | ChemElectroChem |
| Authors | Loredana Preda, Takeshi Kondo, Tanţa Spătaru, Mariana Marin, Mihai Marian Radu |
| Institutions | Romanian Academy, Tokyo University of Science |
| Citations | 22 |
Abstract
Section titled “Abstract”Abstract Electrocatalytic activity toward methanol oxidation in alkaline media of platinum nanoparticles supported on iridium oxide modified boron‐doped diamond powder (Pt/IrO 2 /BDDP) was assessed, and was compared with that of Pt deposited on bare diamond particles (Pt/BDDP). Cyclic voltammetry attests that the presence of the iridium oxide intermediary layer promotes methanol oxidation and provides a more efficient reactivation of Pt particles. Linear sweep voltammetric experiments performed in methanol‐free solution indicated that, at Pt/IrO 2 /BDDP, oxygen evolution is preceded by the formation, within the potential range of CH 3 OH oxidation, of adsorbed oxygenated species. As expected, the presence in close proximity of Pt particles of such species and of an important amount of IrO x (OH) y (evidenced by XPS) assists in the oxidative desorption of CO species adsorbed on Pt active sites. Steady‐state polarization measurements carried out in a floating configuration with Pt/IrO 2 /BDDP gas‐diffusion‐type electrodes yielded for methanol oxidation overall process Tafel slope values of ca. 120 mV decade −1 , which compare well with those reported for traditional electrocatalysts.