| 摘要 |
PROBLEM TO BE SOLVED: To obtain a photocatalyst showing catalytic activity against light within a visible light region and having a laminar structure by adding a transition metal element in the constitutional elements of a photocatalyst respresented by a specific structural formula. SOLUTION: A photocatalyst having catalytic activity within a visible light region composed of composite oxide decomposing water by light to generate hydrogen and/or oxygen is represented by general formula, AB2 C3-x Mx O10-x (wherein A is hydrogen or an alkali metal element, B is a divalent element containing an alkaline earth element, C is a pentavalent element, M is a trivalent element and (x) is an arbitrary number of 0-3). Concretely, M is Fe or Ni and A is H or Na and B is Ca or Cr and C is V or Nb. Since a transition metal element is added to constitutional elements, catalytic activity is shown even against light within a visible light region and, since the interlaminar parts of a laminar structure can be utilized as a place of hydrocracking reaction, a larger quantity of hydrogen can be generated. |
