Controlled generation of chemical defects on the basal plane of molybdenum disulfide (MoS2)

• Grant number: 23/17576-4
• Support Opportunities: Regular Research Grants
• Start date: August 01, 2024
• End date: July 31, 2026
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Inorganic Chemistry
• Principal Investigator: Murilo Santhiago
• Grantee: Murilo Santhiago
• Host Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia e Inovação (Brasil). Campinas , SP, Brazil
• Associated researchers: Jefferson Bettini
• Associated research grant(s): 24/18470-8 - Strengthening cooperative research between Brazil and Italy by preparing conductive bamboo-based electrochemical devices modified with nanostructured molybdenum disulfide, AP.R SPRINT; 24/15173-2 - Multi-user equipment approved in grant 2023/17576-4: potentiostat/galvanostat with low current and impedance modules, AP.EMU
• Associated scholarship(s): 25/06125-7 - Electrochemical thinning and controlled insertion of chemical defects in MoS2 monolayers supported on graphite electrodes, BP.DD; 24/15128-7 - Stacking of high aspect-ratio molybdenum disulfide (MoS2) monolayers using sequential electrochemical thinning, BP.DD

Abstract

Monolayer molybdenum disulfide (MoS2) has shown very promising catalytic activity for the electrochemical generation of hydrogen. However, the basal plane represents the region of area in the monolayer is inert to hydrogen generation. In order to activate the basal plane, several methods have been proposed to generate defects in the form of sulfur vacancies and/or active edges on the monolayer. However, the generation of defects with high spatial resolution in the basal plane still represents a challenge due to the types of routes used, which for the most routes do not allow a fine-tuning in the defect-engineering step. In this project we aim the preparation of ultra-high aspect ratio MoS2 monolayers to generate defects with spatial resolution in the basal plane. By overcoming this challenge, it will be possible to have a better understanding of the interface in the region of the defects generated in the basal plane and how these defects impact hydrogen evolution on electrodes. To characterize the defects created with atomic resolution we propose to perform the nanofabrication process directly on suspended monolayers and characterize the samples using transmission electron microscopy. (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)

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)