Study of the influence of mechanical deformations on the performance of stretchable devices based on MoS2 for application in the energy area

• Grant number: 22/00955-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: July 01, 2022
• Status: Discontinued
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Murilo Santhiago
• Grantee: Leonardo Hideki Hasimoto
• Host Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia e Inovação (Brasil). Campinas , SP, Brazil
• Associated scholarship(s): 23/16254-3 - Fabrication of stretchable carbon electrodes using CO2 laser, BE.EP.DR

Abstract

Molybdenum disulfide (MoS2) is a promising lamellar material for application as an electrocatalyst for Hydrogen Evolution Reaction (HER), since it presents low cost and high abundance. However, its activity is associated with the presence of edge sites, while the predominant basal plane is inert to such process. Defects in the form of sulfur (S) vacancies and mechanical stress from these defects are described to improve the performance of MoS2 for electrochemical applications. While the generation of S vacancies has been widely investigated using different methods, the study of the influence of deformations in the MoS2 structure has been less explored and mainly carried out on rigid substrates, with less possibility of modulating the degree of deformation. In order to fully explore the possibility of applying MoS2 for hydrogen production, it is imperative, therefore, to carry out fundamental electrochemical studies regarding the role of mechanical deformations in the activity of this material. In this work, we intend to deposit monolayers of MoS2 with high aspect ratio on conductive elastomeric substrates. In order to obtain information related to the basal plane, we will isolate the edge regions using an insulating resin and, then, from the manufactured device, we intend to generate S vacancies and study the effect of different degrees of mechanical deformation on the activity of the basal plane of MoS2 with relation to HER. In addition, we intend to perform for the first-time studies related to the reversibility of the mechanical process. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FLORINDO, BIANCA ROCHA; HASIMOTO, LEONARDO H.; DE FREITAS, NICOLLI; CANDIOTTO, GRAZIANI; LIMA, ERIKA NASCIMENTO; DE LOURENCO, CLAUDIA; DE ARAUJO, ANA B. S.; OSPINA, CARLOS; BETTINI, JEFFERSON; LEITE, EDSON R.; et al. Patterning edge-like defects and tuning defective areas on the basal plane of ultra-large MoS₂ monolayers toward the hydrogen evolution reaction. JOURNAL OF MATERIALS CHEMISTRY A, v. 11, n. 37, p. 10-pg., 2023-09-26. (22/00955-0)

ROCHA, JAQUELINE F.; HASIMOTO, LEONARDO H.; SANTHIAGO, MURILO. Recent progress and future perspectives of polydopamine nanofilms toward functional electrochemical sensors. ANALYTICAL AND BIOANALYTICAL CHEMISTRY, v. N/A, p. 18-pg., 2023-01-16. (22/00955-0)