Banca de QUALIFICAÇÃO: BEATRIZ DE PAIVA GERMANO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : BEATRIZ DE PAIVA GERMANO
DATE: 30/05/2025
TIME: 09:00
LOCAL: Auditório do NUPPRAR
TITLE:

Solar-powered Ni-Mo-P electrocatalysts for H2 production from agricultural bioresources

KEY WORDS:

Green hydrogen, Circular economy, Life cycle analysis, bioresources

PAGES: 89
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The electrocatalytic oxidation of lignin, a rich renewable aromatic source that can provide high-value compounds, is a potential process to convert this feedstock into biofuels and high-value chemicals under mild operating conditions with simultaneous hydrogen production. In this study, a NiMoP coating was electrodeposited on stainless steel for the electrooxidation of lignin and consequent production of carboxylic acids and hydrogen. This coating was characterized by SEM/EDX, cyclic voltammetry and polarization curve analysis. The electrooxidation of lignin was carried out in a two-compartment electrochemical reactor (cathodic and anodic), separated by an anionic membrane. The reactions were carried out under different current densities (40, 70 and 100 mA cm⁻²) and lignin concentrations (500, 1000 and 1500 mg L⁻¹), with monitoring of the volume of hydrogen (H₂) produced at the cathode. The NiMoP films contained many branched cracks on the substrate surface due to the internal stress generated by the molybdenum co-deposition that alters the crystallographic structure of nickel. The linear sweep voltammetry curves showed that the incorporation of Mo into the NiP matrix decreases the onset potential of the hydrogen evolution reaction. It was also observed that the hydrogen production was influenced only by the current density and electrolysis time. From the electrocatalytic oxidation of lignin, formic and acetic acids were generated. The formation of carboxylic and phenolic acids increased in the first 30 min of electrolysis and then remained constant for all current densities and lignin concentrations investigated.

COMMITTEE MEMBERS:
Presidente - 2275848 - ELISAMA VIEIRA DOS SANTOS
Externo ao Programa - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE - UFRNExterno à Instituição - JOSÉ EUDES LIMA SANTOS - IFRN
Externo à Instituição - KAIQUE SOUZA GONÇALVES CORDEIRO OLIVEIRA