Evaluation of the impact of defect insertion on the electrical and electrochemical properties in monolayers of MoS2.

• Grant number: 23/15689-6
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: September 01, 2024
• End date: August 31, 2026
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Murilo Santhiago
• Grantee: Matheus Felipe Fagundes das Neves
• Host Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia e Inovação (Brasil). Campinas , SP, Brazil
• Associated scholarship(s): 25/04673-7 - Controlling the insertion of defects on large-area MoS2 layers by electrochemical and chemical processes, BE.EP.PD

Abstract

Renewable energy and abundant eco-friendly fuels have been topics of discussion in research over the past few decades. Two-dimensional materials known as TMDs have unique properties that make them suitable for use in alternative energy generation devices. One of these materials is molybdenum disulfide (MoS2), where the catalytic sites on its monolayers are used for the hydrogen evolution reaction (HER). The active sites can be sulfur vacancies and edge defects. The introduction of defects increases the electrocatalytic activity but affects the electrical properties of MoS2 monolayers. Thus, understanding the impact of defects on electrical measurements and correlating them with electrocatalytic activity is still a challenge in the field of layered materials due to contamination effects during sample preparation. Therefore, the current project aims to develop a new method for preparing MoS2 monolayers with a high aspect ratio directly on interdigitated electrodes. This method will enable electrical and electrochemical characterization in the same monolayer using preparation techniques that do not introduce contamination or unintended defects. Electrocatalytic activity will be modulated by the introduction of defects using different methods. We will use various characterization techniques to study the impact of defect introduction on electrical and electrochemical properties.

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)

DE LOURENCO, CLAUDIA; DE ARAUJO, ANA B. S.; HASIMOTO, LEONARDO H.; FEITOSA, ISAQUE A. A.; DAS NEVES, MATHEUS F. F.; BETTINI, JEFFERSON; PERFECTO, TARCISIO M.; ROCHA, TULIO C. R.; MORI, THIAGO J. A.; LEITE, EDSON R.; et al. Size-dependent electrocatalytic hydrogen evolution activity of arrays of edge-like defects in MoS₂ crystals patterned by focused ion beam. JOURNAL OF MATERIALS CHEMISTRY A, v. N/A, p. 10-pg., 2024-11-11. (23/15689-6, 22/14720-4, 22/00955-0, 23/17576-4)