The anodic oxidation of hydrogen at platinized electrodes of the lower tungsten oxides occurs via a route involving hydrogen tungsten bronze formation on the surface of filmInitial performance of the platinized lower tungsten oxide electrodes is lower than the corresponding electrodes. However, their performance improves with time as the surface is converted to rich layers until a limiting thickness is reached. The bulk of the lower tungsten oxide is then protected from further oxidation and does not participate in the over‐all electrode reaction. It does, however, provide a conducting pathway to the current collector, even under flooded hydrogen‐starved conditions, thus ensuring long‐term stability in performance as compared with platinized electrodes.