Popis: |
Three compounds, SrTa 2 O 6 , Sr 4 Ta 2 O 9 , and Sr 5 Ta 4 O 15 , were synthesized by a polymerizable complex method. Their photocatalytic activities for water splitting into H 2 and O 2 were tested and compared against previously published results for Sr 2 Ta 2 O 7 . It was found that the efficiency of the catalysts decreases in the following order: Sr 2 Ta 2 O 7 >Sr 5 Ta 4 O 15 > SrTa 2 O 6 > Sr 4 Ta 2 O 9 . The relationship between photocatalytic activities and crystal structures is discussed. |