Modification of carbon-supported RuSe_x nanoparticles or cobalt porphyrin catalytic centers with ultra-thin films of tungsten oxide results in the enhancement of their catalytic properties towards electroreduction of oxygen in acid (0.5 mol dm^-3 H₂SO₄) medium as evidenced from the positive shift of the O₂ reduction potential and the higher heterogeneous rate constant. An important issue is that the metal oxide support is characterized by good electronic conductivity and proton donating properties. Further, it is reasonable to expect that not only RuSe_x or cobalt porphyrin centers are reactive but also tungsten oxide support is capable of promoting the reduction of the undesirable hydrogen peroxide intermediate. For example, the bifunctional activity of the WO₃-modified RuSe_x system has been the most pronounced at rather low loadings of RuSe_x nanoparticles. An important issue is tolerance of the proposed systems to methanol, ethanol or acetic acid formic acid, i.e. the organic systems that may appear due to crossover in the cathode compartments of methanol or ethanol fuel cells. Further, the WO₃-modified RuSe_x (carbon-free) samples have been immobilized on the gold electrode surface for Synchrotron X-ray Photoelectron Spectroscopy (XPS) examination. The preliminary measurements have been carried out using excitation energies in the range from 90 to 1400 eV. Such experiments allow us to comment on the electronic modification of electron core levels caused by presence of adsorbed WO₃ and to determine the amounts of WO₃ present on the catalyst’s surface after contacting with aqueous media. These results show that the WO₃ is not only adsorbed on catalyst’s surface but it also tends to interact electronically with RuSex catalytic centers. This phenomenon may also explain the relatively good stability of WO₃ on the RuSex surface.

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