No abstract

A synergistic effect is apparent when normalPt/WO3 catalysts are used in hydrogen electrodes. The exact mechanism of this effect depends on the composition and mode of formation of a reduced intermediate tungsten oxide. Chemical analysis and x‐ray studies confirmed that this intermediate oxide consists of blue tungsten bronzes. The influence of Pt loading, platinizing technique, temperature, and pH on the bronze composition was investigated. The maximum reduction false(H0.44WO3false) was obtained using WO3 impregnated with 0.8 weight per cent (w/o) Pt in acidic solution between 25° and 100°C.

Electrochemical measurements on the anodie oxidation of hydrogen on platinized boron carbide and WO~ supports reveal that the latter is an "active" support, participating directly in the over-all electrode reaction. In contrast, boron carbide is an "inert" support and takes no part in the electrode reaction. This work and previous investigations on the composition of the WO3, confirm that the electrode reaction proceeds by the formation and oxidation of hydrogen tungsten bronzes (HxWO3) WO3 -]-xPt --H ~ HzWO8 -t-PtHxWO~-~ WO~ -{-xe-q-xH +

No abstract

No abstract