Real-Time Monitoring of Electrochromic Memory Loss of Layered alpha-MoO3 Nanoplates

Autor(es)

Felix, A. A. ^[1] ; Barbosa, M. S. ^[1] ; Bueno, P. R. ^[1] ; Orlandi, M. O. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Dept Engn Phys & Math, Chem Inst, Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Electrochemical Society; v. 167, n. 16 DEC 1 2020.
• Citações Web of Science: 0

Resumo

Combined in situ cyclic electrochemical and UV-vis spectroscopic methods were employed to monitor the memory loss of electrochromic properties of layered alpha-MoO3 nanoplates. The time-resolved characteristics of this in situ study allowed for the quantification of changes in charge and optical densities as a function of electrochemical potential over time. Lithium ions trapped in the crystalline lattice of alpha-MoO3 during the bleaching process, along with the irreversible reduction of Mo6+ to Mo5+, govern the memory loss responsible for the degradation of the electrochromic properties. These experiments demonstrated the existence of a saturation limit of the structural charge insertion that effectively contributes to the electrochromic performance of alpha-MoO3 nanoplates. The study improves the understanding of electrochromic memory loss and the degradation mechanism and suggests a two-step electrochemical reaction that controls the electrochromic activity of the alpha-MoO3 phase. (AU)

• Processo FAPESP: 19/06568-5 - Estudo in-operando das propriedades na nanoescala em dispositivos de gatilho molecular
• Beneficiário: Martin Schwellberger Barbosa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/26219-0 - Estudo de Sensores Químicos de Elemento Único a base de semicondutores de óxidos metálicos
• Beneficiário: Marcelo Ornaghi Orlandi
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/24839-0 - Eletrônica e eletroquímica em escala nanométrica: fundamentos e aplicações
• Beneficiário: Paulo Roberto Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Temático