Banca de QUALIFICAÇÃO: TUANI CARLA GENTIL

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : TUANI CARLA GENTIL
DATA : 16/11/2020
HORA: 14:00
LOCAL: por participação remota
TÍTULO:

Pd-based nanostructured electrocatalysts and low-cost oxide for the Acetol Oxidation Reaction

PÁGINAS: 28
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Eletroquímica
RESUMO:

Pd-based nanostructured electrocatalysts supported on Carbon Vulcan XC-72 were synthesized by chemical reduction routes via sodium borohydride and solvothermal, exploring different morphologies such as nanoparticles (NP) and nanodendrites (ND), respectively. The use of low-cost oxides as Fe3O4 nano-octahedral synthesized by hydrothermal routes was investigated, in conjunction with the PdND, replacing and reducing part of the high-cost metal charge. Such electrocatalysts were physically characterized using techniques such as XRD, SEM, EDS, Raman, ICP-MS and TEM, and the latter technique contributed to evidence of the desired morphologies from the proposed routes. The electrocatalysts were applied in acetol oxidation reactions (AOR), and in alkaline direct liquid fuel cell anodes. The highest open circuit potential (OCP) value obtained with the experiments on alkaline direct acetol fuel cell (ADAFC - Alkaline Direct Acetol Fuel Cell), operating at 70 ° C, was 1632 mV, using an electrocatalyst anodic PdNDFe3O4/C, material with less metallic Pd charge per electrode area, with 0.305 mg of Pd cm^-2. This operating condition resulted in a power density of 27.2 mWcm^-2, very close to 31.0 mWcm^-2 obtained with the use of the commercial Pd/C AA electrocatalyst, which has a considerably higher cost of charge (1.000 mg of Pd cm^-2). Thus, acetol is a promising fuel due to the high OCP values obtained in the ADAFC experiments, and studies are made possible to optimize the activity of electrocatalysts through the exploration of different morphologies and binary compositions, due to the high power densities and of high-cost metal load reduction.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1544381 - MAURO COELHO DOS SANTOS
Membro Titular - Examinador(a) Interno ao Programa - 1600860 - ALVARO TAKEO OMORI
Membro Titular - Examinador(a) Externo à Instituição - JÚLIO CÉSAR MARTINS DA SILVA
Membro Suplente - Examinador(a) Interno ao Programa - 1543683 - IVANISE GAUBEUR
Membro Suplente - Examinador(a) Interno ao Programa - 1864481 - HUEDER PAULO MOISES DE OLIVEIRA