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3D flower-like PbTiO 3 nanostructures self-assembled with (101) nanosheets have been realized by the hydrothermal treatment of the mixture of the lead and titanium hydroxides under the effect of high KOH concentration. The layered K 2 Ti 6 O 13 formed in situ under the effect of the high KOH concentration plays an important role in the crystallization of the primary PbTiO 3 nanosheets and the further self-assembly of the 3D flower-like perovskite PbTiO 3 nanostructures. The self-assembled 3D flower-like perovskite PbTiO 3 nanostructures express good mesoporous structures and high specific surface area. In consequence, the 3D flower-like perovskite PbTiO 3 nanostructures as supports show excellent ability to enhance the catalytic activity of Pt. Over the Pt/PbTiO 3 nanoflowers, the CO instantaneously completely converts to CO 2 at a very low temperature of ca. 107 C facilitating the catalytic purification of the automotive exhaust produced in the cold-start period.

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