SnSe/rGO thermoelectric composite material and preparation method thereof

Abstract

The invention relates to a SnSe / rGO thermoelectric composite material and a preparation method thereof. The mass fraction x of rGO in the thermoelectric composite material ranges from 0.1 wt% to 3 wt%, and the preparation method comprises the steps of s1, preparing graphene oxide dispersion liquid for standby application; s2, SnCl2. 2H2O and NaOH are fully reacted in deionized water according to acertain proportion; s3, adding NaBH4 into the Na2SnO2 aqueous solution obtained in the S2, and uniformly mixing the NaBH4 and the Na2SnO2 aqueous solution; s4, adding the graphene oxide dispersion liquid obtained in the step S1 into the solution obtained in the step S3, mixing and stirring in an argon environment, and then heating to boil; s5, preparing a NaHSe solution with the same amount of substance as Na2SnO2 in S2, and then adding the NaHSe solution into the mixed solution obtained in S4; S6, keeping the stirring rate in S4 and reacting at the boiling temperature; and S7, after the reaction is finished and cooling is conducted, performing suction filtration and collection on the reaction solution and then placing the solution in a vacuum drying box to be fully dried, and s8, performing the spark plasma sintering on the composite powder obtained in the S7, and obtaining the SnSe / rGO thermoelectric composite material.

Description

technical field [0001] The invention belongs to the field of thermoelectric energy conversion materials, in particular to a high thermoelectric performance SnSe / reduced graphene oxide nanocomposite material and a controllable preparation method thereof. Background technique [0002] Thermoelectric materials can realize mutual conversion between heat energy and electric energy, and have broad application prospects in the fields of automobile exhaust waste heat, industrial waste heat recovery and power generation. The index to measure the material thermoelectric energy conversion efficiency is its dimensionless thermoelectric figure of merit (ZT), ZT=S 2 σT / κ, where S is the Seebeck coefficient, σ is the conductivity, S 2 σ is the power factor, T is the absolute temperature, and κ is the thermal conductivity. Since 2014, SnSe-based thermoelectric materials with high thermoelectric performance and low toxicity have received extensive attention. The Kanatzidis research group ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned problems existing in the prior art, the technical solution of the present invention is dedicated to the controllable, macro-quantity, low-cost solution method preparation and thermoelectric performance optimization of SnSe / reduced graphene oxide (SnSe / rGO) nanocomposites to solve the problem of SnSe multiple Problems in crystal preparation and performance optimization: (1) The composite phases in SnSe composites are mainly metal chalcogenides such as PbSe (Pb is highly toxic), and there is no effective strategy to composite with graphene-based materials and improve performance ; (2) The previously reported SnSe / carbon nanotube thermoelectric composite material (which is a low-dimensional carbon material like graphene) is prepared by ball milling method, which is difficult to control the nanoscale morphology and size; (3) SnSe polycrystalline It is often prepared by time-consuming and energy-consuming high-temperature reactions, which reduces the economy of its practical application

Images