A kind of preparation method of Al-doped ZNO textured thermoelectric material

Abstract

The invention discloses an Al-doped ZnO texture thermoelectric material manufacturing method and belongs to the technical field of energy materials. The Al-doped ZnO texture thermoelectric material manufacturing method is characterized in that zinc acetate and aluminum nitrate are used as raw materials and configured according to the chemical general formula of Zn1-xAlxO (0.01<=x<=0.5mol), triethanolamine serves as a surfactant, deionized water serves as a solution, the pH value is 7.0-9.0, a hydrothermal reaction is performed for 6-80 hours under the temperature of 120 DEG C to 240 DEG C, a nano-micro composite spherical powder body having the diameter of 1-10 microns and formed through self-assembling of nano-particles of 10-800nm is prepared, heat-preservation sintering is performed for 1-30min under the pressure of 30-200MP and the temperature of 850-1400 DEG C through the spark plasma sintering technology, a Al-doped ZnO block material with the texture degree of 15%-60% is prepared, and the grain size is 100-900nm. The Al-doped ZnO texture thermoelectric material manufacturing method can fast and easily prepare the Al-doped ZnO block material which has the nanometer and texture structure features at the same time, the carrier mobility is improved, meanwhile, the heat conductivity is reduced, and the thermoelectric performance is improved.

Description

technical field [0001] The invention belongs to the technical field of energy materials, in particular to a method for preparing an Al-doped ZnO textured thermoelectric material, and involves a hydrothermal synthesis method and a discharge plasma sintering process. Background technique [0002] With the rapid development of industrialization, energy and environmental issues have become one of the important issues of human society. Thermoelectric materials are functional materials that directly realize the mutual conversion of thermal energy and electrical energy. Thermoelectric devices made of thermoelectric materials can output electric energy through the Seebeck effect in the presence of temperature gradients, which are called thermoelectric batteries; on the other hand, thermoelectric devices can also generate temperature differences through the Peltier effect to achieve the effect of electronic refrigeration. Thermoelectric conversion has the characteristics of small de...

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Problems solved by technology

However, the grain size of the above-mentioned textured bulk materials is relatively large, generally 1-20 μm, which is not conducive to the reduction of thermal conductivity.

At present, the preparation of Zn with both nanometer and textured structure characteristics 1-x Al x O bulk thermoelectric materials have not been reported

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