photocatalyst; photocatalysis
Technical term in chemistry and materials science. Often used as an abbreviation of 光触媒作用 (photocatalytic action).
See also: 光触媒作用
Titanium dioxide is a typical photocatalyst.
Air purifiers using photocatalysis are becoming common.
photocatalysis
Compound of 光 (ひかり, light) and 触媒 (しょくばい, catalyst), a calque from English 'photocatalyst'.