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WO2.72(or W18O49)has the largest oxygen deficiency and is the only one that can be isolated in its stable form among all the other tungsten oxides between the range of WO2.625-WO3.This unusual defect structure of WO2.72 may result in its extraordinary chemical properties.Nonstoichiometric WO2.72 was used as a notable counter electrode catalyst in dye-sensitized solar cells(DSCs).