Banca de QUALIFICAÇÃO: HERBET LIMA OLIVEIRA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : HERBET LIMA OLIVEIRA
DATE: 21/08/2025
TIME: 09:00
LOCAL: Auditório do NUPPRAR
TITLE:

Hybrid electrochemical systems as a strategy in the energy transition

KEY WORDS:

Electrocatalysts, biomass, hydrogen, renewable energy

PAGES: 55
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The development of increasingly efficient electrodes is essential to enable clean energy conversion and storage processes, reducing energy losses and operating costs. Therefore, bifunctional Ni–Co electrodes will be synthesized on nickel foils by electrodeposition using the dynamic hydrogen bubble method (DBM), in which the emergence and release of H2 bubbles act as a template, conferring high porosity to the metal film. The deposition current densities and the Ni–Co ratio in the solution will be adjusted to simultaneously maximize hydrogen evolution (HER) at the cathode and electrochemical oxidation of lignin at the anode. Electrochemical performance will be evaluated by linear voltammetry (LSV) to determine overpotentials and current density curves, cyclic voltammetry (CV) to calculate the electrochemically active area (ECSA), and electrochemical impedance spectroscopy (EIS) to model charge transfer and diffusion processes. The morphology and chemical composition will be characterized by energy-dispersive scanning electron microscopy (SEM/EDS), and the crystal structure will be characterized by X-ray diffraction (XRD). This method is expected to produce electrodes with high specific area, low charge transfer resistance, and low overpotentials for HER, as well as high efficiency in the electrochemical degradation of lignin, demonstrating the potential of MDBH in the production of porous metal catalysts for applications in renewable energy and biomass treatment.

COMMITTEE MEMBERS:
Presidente - 2275848 - ELISAMA VIEIRA DOS SANTOS
Interna - ***.673.134-** - JUSSARA CÂMARA CARDOZO - UFRN
Externo ao Programa - 1645110 - CARLOS ALBERTO MARTINEZ HUITLE - UFRN