| abstract |
Disclosed is a catalyst material which comprises an aggregate of nanoneedles mainly composed of R-type manganese dioxide and has a mesoporous porous structure. The catalyst material enables to oxidatively decompose water at room temperature under irradiation with visible light to produce an oxygen gas, a proton and en electron. Also disclosed is a catalyst material which comprises an aggregate of nanomicroparticles mainly composed of hydrogenated manganese dioxide. The catalyst material enables to synthesize acetic acid or an organic material from a carbon dioxide gas. |