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Cobalt oxide thermoelectric material preparation and physical properties

Author: LinJun
Tutor: HuoDeZuo
School: Hangzhou University of Electronic Science and Technology
Course: Physical Electronics
Keywords: Oxide thermoelectric materials ZnCo2O4 Co3O4 Hydrothermal Synthesis Solid phase reaction
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 85
Quote: 0
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Abstract


Thermoelectric material is a carrier using a solid internal movement, to achieve conversion between heat and electricity direct functional materials, thermoelectric cooling thermoelectric power generation and other fields have great significance and application of broad application prospects. Energy shortage and environmental issues greatly promoted the thermoelectric materials. Good performance of the thermoelectric materials currently contain a certain percentage of toxic and expensive elements such as Te, Sb, Pb and so on. Therefore, the existence in the production process heat cost and environmental pollution problems. As in 1986 the discovery of oxide high-temperature superconductors \> 2 O 4 as a new thermoelectric material possibilities, in the past few decades, the \Oxide thermoelectric materials with a wide range of low cost, no toxicity, no environmental pollution, and the production process is relatively simple, stable performance under high temperature environment, etc., more and more attention, and explore new oxide thermoelectric materials have significance. This solid-state reaction method and hydrothermal synthesis method to explore synthesized two cobalt oxide, its crystal structure, chemical composition and heat, electricity and transport properties have been studied, it may be OK for thermoelectric applications were evaluated. Achieved the following major findings: (1) ZnCo 2 O 4 is a typical spinel type oxide. Previous resolutions on ZnCo 2 O 4 research focuses on its electrical properties for the composite electrode. We began with the ZnO, Co 2 O 3 as experimental material, the use of solid-state reaction method ZnCo 2 O 4 thermoelectric materials by XRD for phase structure were analyzed. 1300 ℃ the following reaction is not complete, is difficult to generate a single-phase material. (2) When Co 2 O 3 Replace Co 3 O 4 for raw materials, even changing the reaction time and the The reaction temperature can not obtain the target product ZnCo 2 O 4 . (3) to Co (NO 3 ) 2 · 6H 2 O, ZnCl 2 , NaOH as raw materials, hydrothermal method at low temperature (180-220 ℃) ​​successfully prepared single phase ZnCo 2 O 4 . Using plasma discharge sintering (SPS), the sintered powder material, its high temperature electrical conductivity measured, Seebeck coefficient and thermal conductivity. When 650K, Seebeck coefficient of 550μV / K, the conductivity of 15S / m, thermal conductivity of 4.5W/mK. (4) to Co (NO 3 ) 2 · 6H 2 O, NaOH as raw materials by hydrothermal method was successfully prepared Co 3 O 4 , nano-materials, sintering method using plasma discharge after sintering temperature measuring its conductivity and Seebeck coefficient. Maximum Seebeck coefficient and electrical conductivity were 220μV / K and 110 S / m.

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