BiIo sensitized BiIO/TiO2 composite electrode material, preparation method and application thereof

Abstract

The invention relates to a BiIO sensitized BiIO/TiO2 composite electrode material, a preparation method and application thereof. The technical scheme comprise the steps of: mixing hydrochloric acid with tetra-N-butyl titanate, transferring a mixture solution and a conductive carrier to a high pressure reaction vessel, performing the hydrothermal reaction, cooling the solution to the room temperature, performing washing and drying, and obtaining TiO2 nano rod arrays; dispersing bismuth nitrate pentahydrate into glycol, slowly adding potassium iodide, performing agitation at the room temperature, and obtaining a Bi(OCH2CH2OH)I2 solution; and dipping the TiO2 nano rod arrays in the Bi(OCH2CH2OH)I2 solution, taking the TiO2 nano rod arrays out, and washing and drying the TiO2 nano rod arrays. The BiIO/TiO2 composite electrode material synthesized by a hydrothermal synthesis method has a high specific surface area and good response in a visible light, and has the characteristics of wide applicability and good stability, simple technology, easy operation, and low cost, and facilitates the popularization and application of the material in the industrial production.

Description

technical field [0001] The invention belongs to the technical field of battery materials, in particular to a BiIO / TiO sensitized by BiIO 2 Composite electrode materials and their preparation methods and applications. Background technique [0002] Due to its superior properties, titanium dioxide has the characteristics of biological inertness, non-toxicity and light-free corrosion, and its low cost, wide resources and strong redox ability make it widely used in solar cells; but because TiO 2 The intrinsic bandgap width is relatively wide (3.2eV), and it can only be excited by ultraviolet light (<380nm), so its utilization efficiency for visible light and sunlight is not high. In addition, TiO 2 Due to the high recombination rate of internal photogenerated electrons and holes or the limitation of the energy band structure, so alone TiO 2 It is difficult to absorb visible light, which limits its application in practical problems. It has been reported in the literature th...

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Problems solved by technology

[0002] Due to its superior properties, titanium dioxide has the characteristics of biological inertness, non-toxicity and light-free corrosion, and its low cost, wide resources and strong redox ability make it widely used in solar cells; but because TiO 2 The inherent bandgap width is wide (3.2eV), and it can only be excited by ultraviolet light (<380nm), so its utilization efficiency for visible light and sunlight is not high

In addition, TiO 2 Due to the high recombination rate of internal photogenerated electrons and holes or the limitation of the energy band structure, so alone TiO 2 It is difficult to absorb visible light, which limits its application in practical problems

It has been reported in the literature that TiO nanorod arrays were synthesized by hydrothermal method 2 , is a nanorod with a length of about 1 μm stacked by crystals. It has a large specific surface area, but its band gap width has not changed much, and the absorption efficiency of visible light is still not high.

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