Electrocatalyst composition comprising noble metal oxide supported on tin oxide
摘要
說明書
Particle Morphology, Presence of a Noble Metal Oxide Layer on the Tin Oxide Particles
The presence of an iridium oxide or iridium-ruthenium oxide layer which is at least partially coating the tin oxide particles was verified by scanning transmission electron microscopy combined with energy-dispersive X-ray spectroscopy (“EDXS mapping”).
In Inventive Example 1, the catalyst composition was prepared as follows:
Non-doped tin oxide powder was used as a support material to be coated by a noble metal oxide. The tin oxide powder had a BET surface area of 25 m2/g.
2 g of the SnO2 powder was dispersed in 400 g water, followed by adding 3.83 g of IrCl4. Subsequently, the aqueous medium was heated to 80° C. and KOH was added until pH=7. From time to time, further KOH was added so as to keep the pH at about 7.
After stirring for about 1 hour, the aqueous medium was cooled to room temperature, the SnO2 powder was separated from the aqueous medium by filtration, washed with water, and calcined in air at 600° C. for about 60 minutes.
