Tubular Thermoelectric Module Based on Oxide Elements Grown by the Laser Floating Zone

constituent parameters. Among the available classes of thermoelectric materials, narrow-band gap chalcogenides [4] have shown high ZT. But these metal chalcogenides serve the purpose only in the low-temperature range. For large-scale power generation using high-grade heat, we need a material that is earth-abundant, nontoxic, and physically, chemically, and thermally stable near 1000 °C. From that perspective, oxides are promising candidates for high-temperature thermoelectric power generation. Among the bulk, n-type oxide thermoelectric materials, donor-doped SrTiO 3 (STO) have shown the best thermoelectric performance with ZT = 0.6. [5] However, ZT > 1 is a prerequisite for practical applications, which has been challenging to achieve in doped STO bulk oxides. The reasons behind their poor ZT values are their high thermal conductivity and poor electrical conductivity. It is observed that doping alone cannot improve the transport properties of STO. One must decouple the power factor (S 2 σ) and lattice thermal conductivity (κ L ) to attain high ZT values. Grain boundary engineering [6,7] and nanocompositing [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] are some of the viable routes to enhance both electron transport and induce more phonon scattering in bulk oxides.Incorporating graphite, [8,9] graphene oxide, [10] and graphene [19,22] into the donor (La, Nb)-doped STO matrix have significantly improved the ZT of STO-based bulk oxides. The most profound aspect of ZT enhancement in doped STO systems reported by various researchers is the single-crystal-like [9,19,23] electron mobility attained in these polycrystalline ceramics when they have formed composites with carbon derivatives. However, the reasons behind such huge surge in electron mobility leading to a manifold increase in electrical conductivity are yet to be fully understood. In STO-based composites with 2D graphene, enhanced electron transport is attributed to the reduction of Schottky barrier height in polycrystallinedoped STO. [11,19] However, it is debatable whether reducing the Schottky barrier alone can cause single-crystal-like electron mobility in doped STO-based composites. [23,24] Formation of the Schottky barrier is usual phenomena observed in polycrystalline materials and the presence of 2D graphene along the grain boundaries [11] is expected to facilitate the formation of excess oxygen vacancies enabling the reduction of Schottky barrier height. But that should not be specific to a particular Here, the first experimental demonstration on the effect of incorporating new generation 2D material, MXene, on the thermoelectric performance of rare-earth-free oxide perovskite is reported. The charge localization phenomenon is predominant in the electron transport of doped SrTiO 3 perovskites, which deters from achieving a higher thermoelectric power factor in these oxides. In this work, it is shown that incorporating Ti 3 C 2 T x MXene in a matrix of SrTi 0.85 Nb 0.15 O 3 (STN) facilitates the delocalization of electrons resulting in bet...

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“…TEG made of these novel composites exhibits twice the power output than that ever reported for the oxide TEGs. [9,[43][44][45][46][47][48]…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermoelectric Performance of Rare‐Earth‐Free n‐Type Oxide Perovskite Composite with Graphene Analogous 2D MXene

Dixit

Jana

Maiti

2023

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“…Waste heat recovery through thermoelectric materials requires the fabrication of a thermoelectric module device [31]. A thermoelectric module consists of n-and p-type materials in which electrons and holes participate in the conduction mechanism.…”

Section: Introductionmentioning

confidence: 99%

Perovskite Oxide Thermoelectric Module - A Way Forward

Nag

2023

Catal Res

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In the era of renewable and sustainable energy, perovskite materials remain pioneers as energy harvesting materials, be it thermoelectric waste heat harvesting or photovoltaic solar cell application. Oxide perovskite material is an emerging thermoelectric material in solving energy shortage issues through waste heat recovery. The chemical and structural stabilities, oxidation resistance, and cost-effective and straightforward manufacturing process are a few advantages of the oxide-based thermoelectric materials. The perovskite thermoelectric materials and module thereof does not require any vacuum bagging for operation at high temperature, irrespective of the application environment. Perovskite CaMnO3 displays a high Seebeck coefficient (S~-350 μV/K) due to correlated electron structure and low thermal conductivity (3 W m-1 K-1) but high electrical resistivity simultaneously. The electrical resistivity of CaMnO3 can be tuned by electron doping at the Ca-site and Mn-site. Electron doping by substituting Mn3+ with trivalent rare-earth ions increases the carrier concentration in the CaMnO3 system by partially reducing Mn4+ to Mn3+, improving electrical conductivity without altering the Seebeck coefficient. The dual-doped Ca1-xYbx/2Lux/2MnO3-based n-type perovskite thermoelectric material showed a much higher power factor than undoped CaMnO3 and proved to be an efficient perovskite from the application point of view. The thermoelectric module, in combination with CaMnO3 as an n-type element and Ca3Co4O9 or doped-Ca3Co4O9 as the p-type element, is the most efficient device reported to date. The lab-scale power generation experiment is carried out for 4-element and 36-element modules consisting of perovskite Ca1-xYbx/2Lux/2MnO3 as n-type elements and Ca3Co4O9 as p-type elements. The results showed the challenges of up-scaling the perovskite module for high-temperature waste heat harvesting applications.

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All-oxide thermoelectric π-element with a composite interconnector obtained by hydrostatic pressing

Shamsutov

Markov

Merkulov

2023

Ceramics International

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Tubular Thermoelectric Module Based on Oxide Elements Grown by the Laser Floating Zone

Cited by 6 publications

References 48 publications

Enhanced Thermoelectric Performance of Rare‐Earth‐Free n‐Type Oxide Perovskite Composite with Graphene Analogous 2D MXene

Enhanced Thermoelectric Performance of Rare‐Earth‐Free n‐Type Oxide Perovskite Composite with Graphene Analogous 2D MXene

Perovskite Oxide Thermoelectric Module - A Way Forward

All-oxide thermoelectric π-element with a composite interconnector obtained by hydrostatic pressing

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