he Substrate Morphology Effect for Sulfur-Rich Amorphous Molybdenum Sulfide for Electrochemical Hydrogen Evolution Reactio

Author(s)

Medina, Marina ^[1] ; Corradini, Patricia G. ^{[1, 2]} ; de Brito, Juliana F. ^[1] ; Santos, Hugo L. Sousa ^[1] ; Mascaro, Lucia Helena ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil

^[2] Fluminense Fed Inst Educ Sci & Technol, Campus Itaperuna, BR-28300000 Itaperuna, RJ - Brazil

• Document type: Journal article
• Source: Journal of the Electrochemical Society; v. 169, n. 2 FEB 1 2022.
• Web of Science Citations: 0

Abstract

Amorphous molybdenum sulfide (MoSx) is a promising material for hydrogen evolution reaction (HER) due to its nearly zero hydrogen adsorption free energy at the sulfur (S) edge-sites. To prepare more efficient MoSx-based electrocatalysts, new attempts are required to increase the exposure of the MoSx lateral size and, therefore, increase the S atom's contents. The majority of studies reported in the literature investigate MoSx over conductive substrates. However, MoSx can be electrodeposited over inexpensive and chemically stable platforms, such as semiconductors. This work presents the semiconductor substrate morphology effect for prepared sulfur-rich MoSx for electrochemical hydrogen evolution reaction. The electrodes are prepared by cyclic voltammetry with 25 cycles over TiO2 film and TiO2 nanotubes (TiO2NT) substrates. The MoSx deposit on TiO2NT presents an increase S atoms contents and exhibits excellent HER activity with a low overpotential of 93 +/- 7.5 mV to reach -10 mA cm(-2) and a higher exchange current density equal to 91 mu A cm(-2), and a smaller Tafel slope of 43 mV dec(-1). (c) 2022 The Electrochemical Society ({''}ECS{''}). Published on behalf of ECS by IOP Publishing Limited. (AU)

• FAPESP's process: 17/12794-2 - Synthesis, characterization and application of MoS2 and WS2 films in photoelectrocatalysis for hydrogen production
• Grantee: Marina Medina da Silva
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
• Grantee: Ana Flávia Nogueira
• Support Opportunities: Research Grants - Research Centers in Engineering Program
• FAPESP's process: 18/16401-8 - Photocatalysts and photoelectrodes for obtaining renewable fuels
• Grantee: Lucia Helena Mascaro Sales
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/02950-0 - Photoelectrocatalytic reduction of N2 to NH3 in a photoelectrochemistry reactor with a photoanode-driven of Nb2O5/Pt and cathode of GDL decorated with Fe, Co and Sb2Se3
• Grantee: Juliana Ferreira de Brito
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 14/50249-8 - Green chemistry: sustainable synthetic methods employing benign solvents, safer reagents, and bio-renewable feedstock
• Grantee: Arlene Gonçalves Corrêa
• Support Opportunities: Research Grants - Research Centers in Engineering Program