The TiO 2 @PANI core/shell nanorod array is prepared by the combination of hydrothermal and electropolymerization methods. A significant optical modulation (57.6% at 700 nm), high coloration efficiency (37.1 cm 2 C −1 ), and good cycling performance (62.1% after 1000 cycles) are achieved for the TiO 2 @PANI core/shell nanorod array. The improved electrochromic properties are mainly attributed to the core/shell structure, formation of the donor−acceptor system, and the porous space among the nanorods, which can reduce the oxidation potential, make the ion diffusion easier and provide larger surface area for charge-transfer reactions. The data indicate great promise for the TiO 2 @PANI core/shell nanorod array as a potential multicolor electrochromic material.

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A hierarchical Fe 3 O 4 microsphere/graphene nanosheet (H-Fe 3 O 4 -MS/GNS) composite has been synthesized by a facile one-pot solvothermal route. The Fe 3 O 4 microspheres uniformly decorated the surface of the two dimensional GNS. Each Fe 3 O 4 microsphere possesses a hierarchical and porous structure, which is composed of Fe 3 O 4 nanoparticles with a diameter of about 10 nm. As an anode material for Li-ion batteries, the H-Fe 3 O 4 -MS/GNS composite shows high specific capacity and good cycling stability (1171.6 mA h g À1 at 200 mA g À1 and 940.4 mA h g À1 at 500 mA g À1 up to 70 cycles), reduced voltage hysteresis, as well as enhanced rate capability. The improved electrochemical performance can be attributed to the combination of the conductivity, confinement and dispersion effects of GNS and the porous hierarchical structure of the Fe 3 O 4 microsphere.

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