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Electrodeposition and characterization of Sb2Se3 and MSbxSey (M = Cu, Co, Ni, or Zn) thin films for applications in the hydrogen production and CO2 reduction.

Grant number: 17/21365-8
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2018
Effective date (End): February 28, 2022
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Lucia Helena Mascaro Sales
Grantee:Magno Barcelos Costa
Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Associated research grant:13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID


Recently, unrestrained industrial and population growth have brought problems directly related to the significant increase in energy consumption. Approximately 85% of this consumption comes from the burning of fossil fuels, resulting in a large amount of CO2 released into the atmosphere and boosting the greenhouse effect and climate change. Therefore, the lack of use of renewable or sufficiently clean energy sources is a realproblem and the search for sustainable development is a challenge in modern research. In this scenario, solar energy has gained huge attention because it is a clean and inexhaustible alternative, whose radiation can be harnessed in different ways. One of them is the chemical energy, where two of its main purposes are strongly highlighted: the process of water photoelectrolysis into H2(g) - a powerful and clean fuel - and the photoelectrochemical reduction of CO2 to industrial interest compounds - a promising form of CO2 recycling. As materials developed to this application, there was a resurgent interest in low toxicity, earthabundant, and low-cost semiconductors. Therefore, binary and ternary copper-based chalcogenides, for example, Sb2Se3 and CuSbSe2, respectively, are considered important semiconductors because they have shown good photovoltaic and photoelectrochemical properties. Additionally, according to studies associated to the hydrogen evolution reaction catalysis, compounds with Co, Ni and Zn have also shown positive photoactivity results.Due to these circumstances, the present work proposes the obtaining of Sb2Se3 and MSbxSey (M = Cu, Co, Ni, or Zn, for doped and ternary systems) by means of electrodeposition in the formation of photocathodes applied to the production of hydrogen or CO2 reduction. The films will be characterized in terms of their morphology, composition and crystalline structure by scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction techniques, respectively; UV-Vis and electrochemical impedance spectroscopy will be used to characterize optoelectronicproperties, while the photocurrent of the films will be evaluated by means of photoelectrochemical characterization, both in the absence and in the presence of Pt, MoS2and WS2 catalytic nanoparticles decorated on the films' surfaces. Finally, an electrode ofconfiguration Sb2Se3(or MSbxSey)/CdS/ZnO/catalytic nanoparticles will be fabricated and tested in the hydrogen production or reduction of CO2 reactions.

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)
COSTA, MAGNO B.; LUCAS, FRANCISCO W. S.; MEDINA, MARINA; MASCARO, LUCIA H. All-Electrochemically Grown Sb2Se3/a-MoSx Photocathodes for Hydrogen Production: The Effect of the MoSx Layer on the Surface Recombination and Photocorrosion of Sb2Se3 Films. ACS APPLIED ENERGY MATERIALS, v. 3, n. 10, p. 9799-9808, OCT 26 2020. Web of Science Citations: 0.
COSTA, MAGNO BARCELOS; LUCAS, FRANCISCO W. S.; MASCARO, LUCIA HELENA. Improvement of electrodeposited Sb(2)Se(3)thin film photoelectroactivity by cobalt grain boundary modification. JOURNAL OF MATERIALS CHEMISTRY A, v. 8, n. 27, p. 13742-13753, JUL 21 2020. Web of Science Citations: 0.
COSTA, MAGNO BARCELOS; LUCAS, FRANCISCO W. S.; MASCARO, LUCIA HELENA. Electrodeposition Conditions Effect Sb2Se3 Thin-Film Properties. CHEMELECTROCHEM, v. 6, n. 11, p. 2937-2944, JUN 3 2019. Web of Science Citations: 2.

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