Transições de fase e funcionalização química em nanoestruturas de MoS2 : aplicações em energias renováveis

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dc.contributor.advisorMaroneze, Camila Marchetti
dc.contributor.advisor-co1Rocha, Leandro Seixas
dc.contributor.advisor-co1Latteshttp://lattes.cnpq.br/9575661316014079por
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/2414168927233444por
dc.contributor.authorSantos, Felipe Conceição dos
dc.creator.Latteshttp://lattes.cnpq.br/4009951509560283por
dc.date.accessioned2020-07-01T17:54:13Z
dc.date.accessioned2020-12-07T15:07:15Z
dc.date.available2020-12-07T15:07:15Z
dc.date.issued2019-12-19
dc.description.abstractThe eminent scarcity of fuels based on fossil resources, as well as serious environmental damage arising from their utilization, imposes us a need to search for more sustainable alternatives in the energy field. The use of hydrogen as a fuel presents itself as a promising solution, having as a main challenge the substitution of platinum for catalysts that provides energetic viability to electrochemical technologies. The transition metal dichalcogenides (TMDs), especially the molybdenum disulfide (MoS2), is pointed as a potential substitute for the metal catalysts due to the high catalytic activity observed for MoS2 when presented in the metallic phase (1T). However, the 1T phase is thermodynamically metastable, and it is essential to develop strategies to stabilize the metal phase of MoS2 without compromising its catalytic properties. The present work describes a study of the stability of the 1T’ phase (distorted metallic) in MoS2 nanostructures prepared by chemical exfoliation with nbutillithium. Initially it is presented the synthesis of a material with mixed character (1T’/2H-MoS2) as well as the impact of the presence of semiconducting domains in the stability of the 1T’ phase and in the material’s catalytic properties. Additionally, surface chemical functionalization of 1T’-MoS2 with organic molecules were studied as a tool to promote the metallic phase stabilization. The results indicated that the presence of semiconducting domains possess a great negative impact both in the 1T’ phase stability and in the electrocatalytic performance of the material in the hydrogen evolution reaction (HER). The chemical modification of the surface of MoS2 presented itself as a pretty efficient strategy to stabilize the 1T’ phase and prevent 1T’-MoS2 oxidation.eng
dc.formatapplication/vnd.openxmlformats-officedocument.wordprocessingml.document*
dc.identifier.citationSANTOS, Felipe Conceição dos. Transições de fase e funcionalização química em nanoestruturas de MoS2 : aplicações em energias renováveis. 2019. 56 f. Dissertação (mestrado em Engenharia de Materiais e Nanotecnologia) - Universidade Presbiteriana Mackenzie, São Paulo, 2020.por
dc.identifier.urihttp://dspace.mackenzie.br/handle/10899/26508
dc.keywordsMoS2eng
dc.keywordsphase transitionseng
dc.keywordschemical functionalization.eng
dc.languageporpor
dc.publisherUniversidade Presbiteriana Mackenziepor
dc.rightsAcesso Abertopor
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectMoS2por
dc.subjecttransições de fasepor
dc.subjectfuncionalização químicapor
dc.subject.cnpqCNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICApor
dc.titleTransições de fase e funcionalização química em nanoestruturas de MoS2 : aplicações em energias renováveispor
dc.typeDissertaçãopor
local.contributor.board1Silva, Cecilia de Carvalho Castro e
local.contributor.board2Mararigone, Valéria Spolon
local.publisher.countryBrasilpor
local.publisher.departmentEscola de Engenharia Mackenzie (EE)por
local.publisher.initialsUPMpor
local.publisher.programEngenharia de Materiais e Nanotecnologiapor
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