The photocatalytic hydrogen evolution and electrochemical behaviors of Kiggen-type XW12O40^n- （X=P, Ge and Si） are investigated. It is found that the two-electron reduced species are active for H^＋ reduction and the more negative the potential of XW12O40^（n＋2）-/（n＋1）- is, the higher the activity for hydrogen evolution is.
Li Qin DANGWan Sheng YOUXin ZHANGCui Ying HUANGZhi Bin LEIZhen Gang SUNCan LI
