PLATINUM BLACK POWDER, PLATINUM BLACK COLLOID, AND METHODS FOR PRODUCING THEM

摘要

PROBLEM TO BE SOLVED: To obtain platinum black catalytic powder having high activity.

SOLUTION: A platinum black powder has ≥80 m2/g or further ≥90 m2/g BET specific surface area. The platinum black powder is produced by producing nanocolloid of hexahydroxoplatinic acid in a liquid phase, adding a reducing agent to the nanocolloid of hexahydroxoplatinic acid to reduce the nanocolloid and form platinum-containing colloid, filtering the formed platinum-containing colloid, washing the filtered platinum-containing colloid with purified water, and drying the washed platinum-containing colloid.

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