| 摘要 |
According to one embodiment, there is provided an active material. The active material includes a titanate oxide compound. The active material has a peak appearing in a range of 1580 cm−1 to 1610 cm−1 in the infrared diffusion reflective spectrum when pyridine is absorbed onto the active material and released from it, after that, the active material is subjected to measurement of the infrared diffusion reflective spectrum. Further, a relationship represented by the following formula (I) is satisfied: S1/S2≧2.4 (I). Wherein S1 indicates an area of a peak appearing in a range of 1430 cm−1 to 1460 cm−1 in the spectrum, and S2 indicates an area of a peak appearing in a range of 1520 cm−1 to 1560 cm−1 in the spectrum. |
