suggested that the ability for Li + to more freely diffuse through these smaller channels allowed for the increased capacity observed in Li + electrolytes compared to Na + ones for monoclinic tungsten oxide nanorods. Na + is believed to be unable to diffuse through these trigonal sites due to the larger size of the cation. Due to the similar observed capacities of the material in these two electrolytes, we believe that the ability for these two cations to diffuse through the square channels in the material leads to the increased capacity, with the trigonal channels being too small to allow for ion diffusion for the hexagonal crystal structure.