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Preparation of p-type Bi2Sr2Co2Ox and n-type doped CaMnO3 polycrystalline thermoelectric bulk materials by Pilot Spray Drying processing way
Combe, Emmanuel; Bastin, Frédérique; Caes, Sébastien et al.
20172017 meeting of the Belgian Ceramic Society
 

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Keywords :
oxide; thermoelectric; processing
Abstract :
[en] Since decades, thermoelectricity is deeply studied as no-waste energy source. Thermoelectric (TE) materials allow the direct transformation of a heat source into an electrical current (Seebeck effect). TE conversion is very attractive as it is the strongest candidate for producing electricity from waste heat energy sources (automobiles, incinerators, boilers, …). For TE applications at high temperatures, oxide compounds have attracted attention, in particular due to their natural oxidation resistance. However, for large scale utilization of TE conversion systems, performances of actual TE oxides compounds must be improved. Among the different studied oxide compositions, misfit cobaltite Bi2Sr2Co2Ox and doped calcium manganate CaMnO3- have attracted much attention, as p and n-type oxide TE elements, respectively. Bi2Sr2Co2Ox (abbreviated BSC-222) material exhibits a layered structure, composed of CoO2 layers which alternate with Bi2Sr2O4 block layers along the c-axis. Such crystallographic structure allows interesting electrical and thermal properties, suitable for reaching high TE performances. On the other hand, CaMnO3- compound (abbreviated as CMO) has an orthorhombic perovskite-type structure with interesting TE properties. Reaching high TE performances requires using new processing way. Indeed, conventional solid-state reaction does not allow controlling the microstructure of materials, i.e. the shape, size, or alignment of grains, size and distribution of porosity of samples. Those parameters play a major role on the electrical and thermal transport properties. With the aim of developing a processing method which can be easily transposable to an industrial level in terms of simplicity, speed, large-scale production and cost, a pilot spray-drying processing method has been developed for the production of BSC-222 and CMO thermoelectric powders. Spray-drying is a processing way in which preparing powders is achieved by passing a solution, or a suspension, in a stream of hot air. By using solutions, or suspensions, of precursor compounds, a more homogeneous dispersion of the cations into the material is reaching. Spray-dried powders are so more reactive, which can help reducing the sintering temperature or duration. This study deals with the preparation of BSC-222 and doped CMO thermoelectric powders by the development of spray-drying method. Contrary to CMO powders, prepared from solution of cations, BSC-222 powders have been prepared from Bi2O3-Co3O4-SrCO3 suspensions. For that purpose, a preliminary study of the stability of the precursors in the suspension’s solvent has been conducted in order to favor a homogeneous distribution of precursors in prepared spray-dried powders. After calcination thermal treatment, spray dried powders with BSC-222 or CMO compositions have been successfully obtained. Polycrystalline BSC-222 and CMO bulk materials have been then prepared by conventional sintering. In this study, we report also on the thermoelectric properties, carried out up to 1000 K, of such prepared polycrystalline bulk materials and compare these with those reported in literature.
Disciplines :
Chemistry
Author, co-author :
Combe, Emmanuel ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Bastin, Frédérique;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Caes, Sébastien ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Thomassin, Jean-Michel ;  Université de Liège - ULiège > Département de chimie (sciences) > Centre d'études et de rech. sur les macromolécules (CERM)
Schrijnemakers, Audrey ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Vertruyen, Bénédicte  ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Cloots, Rudi ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Funahashi, Ryoji;  National Institute of Advanced Industrial Science & Technology, Osaka
Boschini, Frédéric ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Language :
English
Title :
Preparation of p-type Bi2Sr2Co2Ox and n-type doped CaMnO3 polycrystalline thermoelectric bulk materials by Pilot Spray Drying processing way
Publication date :
13 December 2017
Event name :
2017 meeting of the Belgian Ceramic Society
Event place :
Mons, Belgium
Event date :
December 13th 2017
Audience :
International
Available on ORBi :
since 26 June 2018

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