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BaTi4O9 with a tilted octrahedra structure possesses excellent dielectric or photocatalytic performances.In this work,a modified polyacrylamide gel precursor process was presented to synthesize BaTi4O9 powders.Effect of pH value on the stability of the precursor solution was investigated.Nano-sized BaTi4O9 powders were gained after calcining the polyacrylamine gel at 800 ℃ for 2h.The highest hydrogen evolution rate over RuO2-loaded BaTi4O9,in pure water was 270 μmol/h,but no oxygen was oberserved.In a 0.1M NaH2PO4 aqueous solution,oxygen and hydrogen were evolved simultaneously in a ratio of about 1:3.Such point defects as Ti Ti formed in the calcining process were proposed to hamper the evolution of oxgen species; in an acid solution,these defects could be covered by H+,and oxygen could be released.