Preparation method for lead telluride-based thermoelectric coating material

Abstract

The invention belongs to the field of a thermoelectric material and in particular relates to a preparation method for a lead telluride-based thermoelectric coating material. The preparation method comprises the following steps of: using graphite as an anode, Cu, Ni, Al, Au, Ag or graphite as a cathode; carrying out electro-deposition for 3-8 hours in an electrolyte solution at a temperature of 25 DEG C to 65 DEG C; depositing on the surface of the cathode to obtain a PbTe or PbTeTl thermoelectric coating. The electro-deposition method provided by the invention has high efficiency, can obtain PbTe with a controllable thickness and uniform components and a PbTe-based thermoelectric material containing dopant; the electric potential of the electro-deposition or current density is controlled to realize the co-deposition of two or more metals, and to form the PbTe or the PbTeTl coating. The preparation method has low cost, high efficiency and strong operability.

Description

technical field [0001] The invention belongs to the field of thermoelectric materials, and in particular relates to a preparation method of a lead telluride-based thermoelectric coating material. Background technique: [0002] Thermoelectric materials are functional materials that use the thermoelectric effect (also known as the Peltier Seebeck effect) to directly convert heat into electricity or vice versa. Thermoelectric materials can convert electric energy and heat energy into each other, and can be used as thermoelectric and magnetoelectric functional materials. They are important materials for the preparation of solid-state electric refrigeration devices, thermoelectric power generation devices and magnetoelectric devices. The index to characterize the performance of thermoelectric materials is the "figure of merit" of the material Z , which is defined as: Z = α 2 σ / κ ,in: α is the Seebeck coefficient, σ is the conductivity, kappa The figure of merit of t...

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Problems solved by technology

[0005] At present, the methods for preparing PbTe include alloying method, solid phase synthesis method, magnetron sputtering method and physical vapor deposition method. The PbTe prepared by the first two methods is the The two components are mixed in proportion and synthesized by Bridgman sintering or mechanical alloying. When the reaction is incomplete, the composition will be uneven; the latter two methods of magnetron sputtering and physical vapor deposition are very inefficient in producing coatings. , the coating performance decreases

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