Tungsten-based materials for fuel cell applications

Total oxidation of propane on Pt/WOx/Al2O3 catalysts by formation of metastable Ptδ+ species interacted with WOx clusters

“…It is difficult to directly relate the oxidation state of Pt species to the acidity of catalyst. The interaction between platinum and tungsten oxide would lead to a proton transfer from the acidic surface OH groups (Brønsted acid-base interaction) to platinum species [36]. The coordinatively unsaturated Pt ı+ cations can be also formed as a result of the electron withdrawing nature of isolated W 6+ atoms forming exposed WO x groups (Lewis acid-base interaction).…”

Core-shell structured tungsten–tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation

“…High catalytic activity of tungsten carbide surface was explained by the filling of the d-orbitals at the Fermi level of tungsten by the electrons from carbon atom positioned interstitially in tungsten lattice [2,3]. Since then, extensive research work has been devoted to the application of tungsten carbide as anode and cathode material in polymer electrolyte membrane fuel cells (PEMFCs), either as catalyst, co-catalyst or catalyst support [3,4]. For the application of tungsten carbide as anode catalyst in direct methanol fuel cell (DMFC), the important results were reported by Weigert et al [5].…”

Influence of heat treatment process on photocatalytic activity of photocatalyst TiO2/TiCxOy coatings during heat treatment in carbon powder

“…Recently, titanium oxycarbide (TiC x O y ) has been attracting much interest for the possible use in catalysis and electrocatalysis, both as catalysts and supports [15][16][17]. TiC x O y is a kind of solid solution of titanium carbide (TiC) and titanium monoxide (TiO), and a large amount of research has been conducted on the structure of TiC x O y [18].…”