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dc.contributor.authorLi, Mengyao
dc.contributor.authorLiu, Yu
dc.contributor.authorZhang, Yu
dc.contributor.authorHan, Xu
dc.contributor.authorXiao, Ke
dc.contributor.authorNabahat, Mehran
dc.contributor.authorArbiol, Jordi
dc.contributor.authorLlorca Piqué, Jordi
dc.contributor.authorAlzate Ibáñez, Angélica María
dc.contributor.authorCabot, Andreu
dc.contributor.otherUniversitat Politècnica de Catalunya. Doctorat en Física Computacional i Aplicada
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2022-03-07T15:53:51Z
dc.date.available2022-10-19T00:25:23Z
dc.date.issued2021-10-19
dc.identifier.citationLi, M. [et al.]. PbS-Pb-Cu xS Composites for Thermoelectric Application. "ACS Applied materials and interfaces", 19 Octubre 2021, vol. 13, núm. 43, p. 51373-51382.
dc.identifier.issn1944-8252
dc.identifier.urihttp://hdl.handle.net/2117/363528
dc.description.abstractComposite materials offer numerous advantages in a wide range of applications, including thermoelectrics. Here, semiconductor-metal composites are produced by just blending nanoparticles of a sulfide semiconductor obtained in aqueous solution and at room temperature with a metallic Cu powder. The obtained blend is annealed in a reducing atmosphere and afterward consolidated into dense polycrystalline pellets through spark plasma sintering (SPS). We observe that, during the annealing process, the presence of metallic copper activates a partial reduction of the PbS, resulting in the formation of PbS-Pb- CuxS composites. The presence of metallic lead during the SPS process habilitates the liquid-phase sintering of the composite. Besides, by comparing the transport properties of PbS, the PbS-Pb-CuxS composites, and PbS-CuxS composites obtained by blending PbS and CuxS nanoparticles, we demonstrate that the presence of metallic lead decisively contributes to a strong increase of the charge carrier concentration through spillover of charge carriers enabled by the low work function of lead. The increase in charge carrier concentration translates into much higher electrical conductivities and moderately lower Seebeck coefficients. These properties translate into power factors up to 2.1 mW m-1 K-2 at ambient temperature, well above those of PbS and PbS + CuxS. Additionally, the presence of multiple phases in the final composite results in a notable decrease in the lattice thermal conductivity. Overall, the introduction of metallic copper in the initial blend results in a significant improvement of the thermoelectric performance of PbS, reaching a dimensionless thermoelectric figure of merit ZT = 1.1 at 750 K, which represents about a 400% increase over bare PbS. Besides, an average ZTave = 0.72 in the temperature range 320-773 K is demonstrated.
dc.format.extent10 p.
dc.language.isoeng
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshThermoelectricity
dc.subject.lcshElectric conductivity
dc.subject.lcshNanoparticles
dc.subject.otherPbS
dc.subject.otherSolution synthesis
dc.subject.otherCuxS
dc.subject.otherThermoelectric
dc.subject.otherNanocomposite
dc.subject.otherNanoparticle
dc.subject.otherEnergy conversion
dc.titlePbS-Pb-Cu xS Composites for Thermoelectric Application
dc.typeArticle
dc.subject.lemacTermoelectricitat
dc.subject.lemacConductivitat elèctrica
dc.subject.lemacNanopartícules
dc.contributor.groupUniversitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia
dc.identifier.doi10.1021/acsami.1c15609
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://pubs.acs.org/doi/10.1021/acsami.1c15609
dc.rights.accessOpen Access
local.identifier.drac32509996
dc.description.versionPostprint (author's final draft)
dc.relation.projectidinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-093996-B-C31/ES/PREPARACION MECANOQUIMICA DE CATALIZADORES PARA APLICACIONES ENERGETICAS: ACTIVACION DE METANO Y PRODUCCION DE HIDROGENO/
local.citation.authorLi, M.; Liu, Y.; Zhang, Y.; Han, X.; Xiao, K.; Nabahat, M.; Arbiol , J.; Llorca, J.; Alzate, A.; Cabot, A.
local.citation.publicationNameACS Applied materials and interfaces
local.citation.volume13
local.citation.number43
local.citation.startingPage51373
local.citation.endingPage51382


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