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The density functional theory (DFT) calculation of hydrogen adsorption on tungsten oxides and calculation of the crystal structure of WO3, W20O58, and W18O49 were performed. These calculations suggest that the length of W‐O bonds in WO3 are 1.913 Å, the length of 66% W‐O bonds in W20O58 is 1.8 to 1.9 Å, and the length of 43.48% W‐O bonds in W18O49 is longer than 2.0 Å. The hydrate (WO2[OH]2), as an...