Effect of Cu powder addition on thermoelectric properties of Cu/TiO 2−x composites

Lu, Yun; Sagara, Katsuhiro; Matsuda, Yusuke; Hao, Liang; Jin, Yang; Yoshida, Hiroyuki

doi:10.1016/j.ceramint.2013.01.107

Cited by 26 publications

(6 citation statements)

References 12 publications

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“…15 Previously, CuGaTe 2 has been widely investigated as a promising candidate for thin lm solar cells, photovoltaic devices, and so on. [16][17][18][19][20] Recently, it has been reported as a promising candidate for TE materials. 14,21 Theerayuth Plirdpring et al 14 found out that pure CuGaTe 2 has a high ZT value at high temperature above 800 K. However, the TE properties of CuGaTe 2 have scarcely been investigated systematically.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermoelectric performance of CuGaTe2 based composites incorporated with nanophase Cu2Se

Zhang

Qin

et al. 2014

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Enhanced thermoelectric performance of CuGaTe2 based composites incorporated with nanophase Cu2Se

Zhang

Qin

et al. 2014

J. Mater. Chem. A

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“…Here, the increase in electrical conductivities of the composites led to a decrease in their Seebeck coefficients [19]. The behavior of the composites in this scenario was explained using rule of mixtures [19]. Additionally, Faleev and Leonard predicted that metallic nanoinclusions within PbTe matrix selectively scatters electrons at the grain boundaries and leads to an enhancement in the Seebeck coefficient of the composites, relative to bulk PbTe [20].…”

Section: Introductionmentioning

confidence: 90%

“…For instance, variation of the ratio of copper to titania in Cu/TiO 2−x composites led to varying electrical conductivities and the Seebeck coefficients in the composites [19]. Here, the increase in electrical conductivities of the composites led to a decrease in their Seebeck coefficients [19]. The behavior of the composites in this scenario was explained using rule of mixtures [19].…”

Section: Introductionmentioning

confidence: 97%

“…These studies employed the use of either two different semiconductors or metal-semiconductor composites for achieving this task. For instance, variation of the ratio of copper to titania in Cu/TiO 2−x composites led to varying electrical conductivities and the Seebeck coefficients in the composites [19]. Here, the increase in electrical conductivities of the composites led to a decrease in their Seebeck coefficients [19].…”

Section: Introductionmentioning

confidence: 99%

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Compositional disorder and its effect on the thermoelectric performance of Zn₃P₂nanowire–copper nanoparticle composites

Brockway¹,

Vasiraju²,

Vaddiraju³

2014

Nanotechnology

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Recent studies indicated that nanowire format of materials is ideal for enhancing the thermoelectric performance of materials. Most of these studies were performed using individual nanowires as the test elements. It is not currently clear whether bulk assemblies of nanowires replicate this enhanced thermoelectric performance of individual nanowires. Therefore, it is imperative to understand whether enhanced thermoelectric performance exhibited by individual nanowires can be extended to bulk assemblies of nanowires. It is also imperative to know whether the addition of metal nanoparticle to semiconductor nanowires can be employed for enhancing their thermoelectric performance further. Specifically, it is important to understand the effect of microstructure and composition on the thermoelectric performance on bulk compound semiconductor nanowire-metal nanoparticle composites. In this study, bulk composites composed of mixtures of copper nanoparticles with either unfunctionalized or 1,4-benzenedithiol (BDT) functionalized Zn₃P₂ nanowires were fabricated and analyzed for their thermoelectric performance. The results indicated that use of BDT functionalized nanowires for the fabrication of composites leads to interface-engineered composites that have uniform composition all across their cross-section. The interface engineering allows for increasing their Seebeck coefficients and electrical conductivities, relative to the Zn₃P₂ nanowire pellets. In contrast, the use of unfunctionalized Zn₃P₂ nanowires for the fabrication of composite leads to the formation of composites that are non-uniform in composition across their cross-section. Ultimately, the composites were found to have Zn₃P₂ nanowires interspersed with metal alloy nanoparticles. Such non-uniform composites exhibited very high electrical conductivities, but slightly lower Seebeck coefficients, relative to Zn₃P₂ nanowire pellets. These composites were found to show a very high zT of 0.23 at 770 K, orders of magnitude higher than either interface-engineered composites or Zn₃P₂ nanowire pellets. The results indicate that microstructural composition of semiconductor nanowire-metal nanoparticle composites plays a major role in determining their thermoelectric performance, and such composites exhibit enhanced thermoelectric performance.

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“…Apart from the I-V-VI 2 compounds, the chalcopyrite I-III-VI 2 materials are also considered promising in the fields of optoelectronic facilities and solar cells. [192][193][194][195] In recent years, chalcopyrite materials show their potential as TE materials. [196][197][198][199][200] The p-type CuGaTe 2 , which has low ρ and high S, reveals a peak zT of 1.4 at 950 K. [201] The stoichiometry of Cu and Ag in Cu 1-x GaTe 2 [197] , Cu 1-x InTe 2 [202] , and Ag 1-x GaTe 2 [198] affects the resultant TE properties notably.…”

Section: P-type Cugate 2 (Phase Diagrams An Te Properties)mentioning

confidence: 99%

Eliciting High‐Performance Thermoelectric Materials via Phase Diagram Engineering: A Review

Deng

Yen

Tsai

et al. 2021

Adv Energy and Sustain Res

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Alongside the evolution of technology timeline, environmental protection and energy sustainability significantly guide the research feast toward the high-performance green energy resources and technologies. [1,2] Alternatives to the fossil fuels that emit harmful greenhouse gases become desired, in which the thermoelectric (TE) materials have played an inevitable role since the 1960s. [3] One of TE technology features is the waste heat recovery via the Seebeck effect, [4] which allows the conversion between thermal energy and electricity. Such a TE generator produces precious electrical energy from any arbitrary interfaces where a temperature gradient exists, simultaneously boosting energy usage efficiency while eases global warming.Many TE materials are being explored for power generation applications, such as GeTe, [5] PbTe, [6,7] Bi 2 Te 3 , [8] and silicides. [9] Moreover, the TE cooler, which utilizes the Peltier effect, [4] emerges as a vital spot-cooling device assembled by all-solid-state materials. With the advantages of refrigerant-free and size-minimization, the TE cooler exhibits the advantages of refrigerant-free and size-minimization, which can be used as the next-generation cooling technology. [10] After more than 60 years of development, the practical application and potential coverage of TE technology are comprehensive. Nevertheless, a TE material's thermal-to-electric efficiency is still required to be boosted. In general, the TE figure-of-merit zT ¼ ðS 2 σÞT=κ positively relates to the performance of TE materials, in which the S is the Seebeck coefficient, σ ¼ ρ À1 refers to the electrical conductivity, and κ ¼ κ e þ κ L þ κ b comprises the total thermal conductivity κ, lattice thermal conductivity κ, and bipolar thermal conductivity κ b , respectively. Most importantly, the S, σ, and κ e have the carrier concentration n H as a common factor, which correlates and depends on each other. Therefore, the counterbalance between the thermal and electrical transport properties is essential to attain high zT values, which could be fulfilled by band structure engineering, [11] carrier optimization, [12,13] filtering effect, [14] , and so on. In parallel, the reduction in κ L also paves the way toward highperformance TE materials, mainly accomplished by all-scale defect engineering [15] and alloying effect. [16] Those imperfections introduce multiscale roadblocks, such as the interstitial/ antisite defect, dislocations, nanoprecipitates, and grain boundaries, aiming to impede the phonons with different wavelengths.Countless efforts bring the breakthroughs of zT value in succession. The peak zT grows less than unity in the 1960s to greater than 2.5 after 2015, [17] whose progress is slow yet steadily. Complex TE materials with various dopants are the primary targets, while different approaches can be adopted. [18,19] The

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Effect of Cu powder addition on thermoelectric properties of Cu/TiO 2−x composites

Cited by 26 publications

References 12 publications

Enhanced thermoelectric performance of CuGaTe2 based composites incorporated with nanophase Cu2Se

Enhanced thermoelectric performance of CuGaTe2 based composites incorporated with nanophase Cu2Se

Compositional disorder and its effect on the thermoelectric performance of Zn₃P₂nanowire–copper nanoparticle composites

Eliciting High‐Performance Thermoelectric Materials via Phase Diagram Engineering: A Review

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Effect of Cu powder addition on thermoelectric properties of Cu/TiO 2−x composites

Cited by 26 publications

References 12 publications

Enhanced thermoelectric performance of CuGaTe2 based composites incorporated with nanophase Cu2Se

Enhanced thermoelectric performance of CuGaTe2 based composites incorporated with nanophase Cu2Se

Compositional disorder and its effect on the thermoelectric performance of Zn3P2nanowire–copper nanoparticle composites

Eliciting High‐Performance Thermoelectric Materials via Phase Diagram Engineering: A Review

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Compositional disorder and its effect on the thermoelectric performance of Zn₃P₂nanowire–copper nanoparticle composites