Halogen-containing tin oxide particles and production method thereof
AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsYoshihiro Yoneda, Akira Aoki, Kenji Suzuoka
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Abstract
These halogen-containing tin oxide particles have a BET specific surface area of 25-100 m2/g and a crystallite diameter of 8-30 nm. The particles optimally contain 0.01-0.75 mass % halogen. Fluorine is optimally contained as the halogen. Optimally, the particles additionally contain tantalum, niobium, phosphorus, antimony, tungsten, or molybdenum. The volume resistivity is optimally 0.1-1000 Ω·cm.
Claims9
A method for producing halogen-containing tin oxide particles, comprising:
- neutralizing a halogen-containing aqueous solution containing a divalent tin compound with an alkali to form a slurry containing a tin oxide precursor;
- oxidizing the precursor;
- and
- performing hydrothermal treatment on the slurry containing the oxidized precursor under a high-temperature-high-pressure condition in which a temperature is 270° C. or higher and pressure is 20 MPa or higher.
A fuel cell electrode catalyst comprising halogen-containing tin oxide particles supporting catalytic metal particles,
- wherein the halogen-containing tin oxide particles have a BET specific surface area from 25 m2/g to 100 m2/g and a crystallite diameter from 8 nm to 30 nm, and the fuel cell electrode catalyst comprises halogen in an amount from 0.01 mass % to 0.75 mass %.
Dependencies are inferred from the claim text.