Method for preparing two-dimensional TiO2 nanometer material through template method

Abstract

The invention provides a method for preparing a two-dimensional TiO2 nanometer material through a template method. The method comprises the following steps: (1) ultrasonically dissolving 0.35-0.4g of oxidized graphene in an 80mol of ethanol solution; (2) adding 60-100ml of ethanol, 2-4g of dodecyl ammonium bromide and 3-6ml of concentrated nitric acid into the solution obtained in the step (1), and uniformly mixing; (3) adding 15-35ml of ethanol and 15-35ml of tetrabutyl titanate into the solution obtained in the step (2), uniformly mixing, reacting in a high-pressure reaction kettle, cleaning the bottom precipitate for 3-4 times by using ethanol after the reaction is ended, and obtaining a composite oxidized graphene and TiO2 structure; (4) treating the composite oxidized graphene and TiO2 structure through hydrogen, so as to obtain a complex for reducing the oxidized graphene and TiO2; and (5) roasting the complex for reducing the oxidized graphene and TiO2 in air, thus obtaining a sheet TiO2 nanometer material. According to the method, preparation of the two-dimensional TiO2 nanometer material is successfully realized, the photoelectric conversion efficiency of a dye-sensitized solar cell assembled by the two-dimensional TiO2 nanometer material serving as a light anode material is high, and the method is suitable for industrial production.

Description

technical field [0001] What the present invention relates to is a kind of preparation method of nanometer material, specifically a kind of two-dimensional TiO2 that is used for photoanode of dye-sensitized solar cell 2 Preparation methods of nanomaterials. Background technique [0002] As an inexhaustible and ecologically pure renewable energy source, solar energy has attracted more and more attention and attention in recent decades. A photoelectrochemical solar cell is a semiconductor optoelectronic device that directly converts solar energy into electrical energy based on the principle of photovoltaics. The photoanode materials traditionally used in DSSCs are semiconductor TiO2, ZnO and SnO 2 Compared with the flat electrode, due to its larger specific surface area, nano-particles can absorb more monolayer dye molecules, thereby obtaining larger photocurrent and photovoltage. However, due to the small crystal grains of nanoparticles and poor crystallization, there are m...

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Problems solved by technology

However, due to the small grains of nanoparticles and poor crystallization, there are many defects on the surface of the particles, which are easy to become the recombination center of photogenerated electrons and holes, which is not conducive to the transmission of photogenerated electrons.

The surface defects of nanoparticles are easy to capture electrons, and the electron transfer rate is slow; although the one-dimensional photoanode material has a fast electron transfer rate, its surface roughness is low and the dye adsorption capacity is small, both of which are not conducive to the improvement of the efficiency of dye-sensitized solar cells.

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