Banca de DEFESA: RAFAEL MASCARENHAS DE ALMEIDA
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.DISCENTE : RAFAEL MASCARENHAS DE ALMEIDA
DATA : 20/08/2020
HORA: 14:00
LOCAL: por participação remota: meet.google.com/sor-vvnr-ewk
TÍTULO:
Water oxidation catalysis promoted by zinc oxide nanorods functionalized with iron(II) oxide-hydroxide and L-glycine nanoparticles.
PÁGINAS: 50
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Química de Interfaces
RESUMO:
Herein, a detailed investigation of the surface modification of a zinc oxide (ZnO) nanorod electrode with FeOOH nanoparticles dispersed in L-glycine was conducted to improve the water oxidation reaction assisted by sunlight. The results were systematically analysed in terms of the general parameters (light absorption, charge separation, and surface for catalysis) that govern the photocurrent density response of metal oxide as photoanode in a photoelectrochemical (PEC) cell. ZnO electrodes surface were modified with different concentration of FeOOH nanoparticles using the spin-coating deposition method, and it was found that 6-layer deposition of glycine-FeOOH nanoparticles (FeOOH(Gly)) is the optimum condition. The glycine plays an important role decreasing the agglomeration of FeOOH nanoparticles over the ZnO electrode surface and increasing the overall performance. Comparing bare ZnO electrodes with the ones modified with glycine-FeOOH nanoparticles an enhanced photocurrent density can be observed from 0.27 to 0.57 mA cm-2 at 1.23 VRHE under sunlight irradiation. The impedance spectroscopy data aid us to conclude that the higher photocurrent density is an effect associated with more efficient surface for chemical reaction instead of electronic improvement. Nevertheless, the charge separation efficiency remains low for this system. The present discovery shows that the combination of FeOOH(Gly) nanoparticle is suitable and environmentally-friend cocatalyst to enhance the ZnO nanorod electrode activity for the oxygen evolution reaction assisted by sunlight irradiation.
MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1544341 - WENDEL ANDRADE ALVES
Membro Titular - Examinador(a) Interno ao Programa - 1844792 - AMEDEA BAROZZI SEABRA
Membro Titular - Examinador(a) Externo ao Programa - 1760527 - FLAVIO LEANDRO DE SOUZA
Membro Titular - Examinador(a) Externo ao Programa - 2604128 - ALEXANDRE JOSE DE CASTRO LANFREDI
Membro Titular - Examinador(a) Externo à Instituição - LUIZ HENRIQUE DALL'ANTONIA - UEL
Membro Suplente - Examinador(a) Interno ao Programa - 149.405.258-05 - KATHIA MARIA HONORIO - USP
Membro Suplente - Examinador(a) Externo ao Programa - 1968862 - JOSE JAVIER SAEZ ACUNA
Membro Suplente - Examinador(a) Externo à Instituição - MARCIO EDUARDO VIDOTTI MIYATA - UFPR