Acoplamento de espectroscopia ultrarrápida e imageamento por difração coerente de Bragg com eletroquímica: desenvolvimento e aplicações

Author(s)

Rafael Alcides Vicente

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Instituto de Química
• Defense date: 2021-07-14

Examining board members

Pablo Sebastián Fernández; Ana Flávia Nogueira; Douglas Galante

• Advisor: Pablo Sebastián Fernández

Abstract

Electrochemistry is an extremely impactful field, which affects several segments in economy, science, and technology. Electrocatalysis is particularly relevant due to its presence in several industrial and environmental applications, and extreme relevance in energy storage and production. In this context, understanding the electrode and electrode-solution interface is undoubtedly necessary to improve the existing electrocatalytic reactions. Thus, the development of new techniques to probe these systems is essential in order to get new information about them for further improvements in the field. Herein, we show the development of instrumentation to perform electrochemical measurements coupled to both femtosecond spectroscopy and Bragg coherent diffraction imaging. The electrolyte dynamics at the solution side of the electrochemical interface is probed using femtosecond spectroscopy, more specifically optical Kerr effect spectroscopy. In addition, we show how BCDI can be used to image changes in the nanoparticle morphology and to observe its strain (in 3D), a parameter that can strongly influence the electrocatalytic behavior of nanocrystalline materials. It is worth noting that these techniques, and the specific instrumentation being developed, will be available both in our group for future collaborations and in the Carnaúba beamline at SIRIUS to be applied in any study in the field of electrochemistry for future external users (AU)

• FAPESP's process: 19/13888-6 - Fundamental studies of the electrode-solution interface in relevant systems in (electro)catalysis
• Grantee: Rafael Alcides Vicente
• Support Opportunities: Scholarships in Brazil - Master