Banca de DEFESA: MICHAEL SEGUNDO SENA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : MICHAEL SEGUNDO SENA
DATE: 28/03/2023
TIME: 13:30
LOCAL: meet.google.com/dhg-pdxt-zzb
TITLE:

Construction of heterostructured photocatalysts of Cs2AgBiBr6/bismuthene and their application to produce solar fuels from photocatalytic CO2 reduction


KEY WORDS:

Halide perovskites, 2D bismuthene, solar fuels, photocatalytic CO2 reduction, CH4 production, charge separation.


PAGES: 155
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Photocatalytic CO2 reduction is a process that uses light energy and photocatalysts to convert CO2 molecules into solar fuels such as H2 and CH4, which are considered promising energy sources due to their high energy density and potential for storage. This process can help address the challenges of sustainable energy production and environmental protection by reducing greenhouse gas emissions as well as providing a way of storing renewable energy. Lead-free halide perovskites have recently been explored as promising materials for photocatalytic CO2 reduction as they offer a safer alternative to traditional lead-based halide perovskites and have shown encouraging results in photocatalysis. Among them, Cs2AgBiBr6 is a double perovskite that stands out as a remarkable alternative due to its non-toxicity, excellent optoelectronic properties and multifunctionality. However, the application of Cs2AgBiBr6 is limited by its low efficiency of separation of photogenerated charges. In this respect, this work reports the synthesis and characterization of Cs2AgBiBr6/bismuthene composites through a selfassembly process of Cs2AgBiBr6 nanoparticles on two-dimensional bismuthene nanosheets with improved photocatalytic activity for CO2 reduction. The optimized Cs2AgBiBr6/bismuthene nanocomposites show a photocatalytic activity of 14,79 (±1,66) μmol g–1 h –1 on an electron basis with 1 sun, with a CH4 selectivity of 81 (±1) %. The improved photocatalytic performance is attributed to their improved charge mobility and suppressed electron–hole pares recombination, along with extended light absorption capacity promoted by the heterojunction of bismuthene with the perovskite.


COMMITTEE MEMBERS:
Presidente - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interna - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Externa ao Programa - 1415657 - ANDREA OLIVEIRA NUNES - UFRNExterna à Instituição - ANDARAIR GOMES DOS SANTOS - UFERSA
Externa à Instituição - VIVIAN STUMPF MADEIRA - UFPB
Notícia cadastrada em: 17/03/2023 02:14
SIGAA | Superintendência de Tecnologia da Informação - (84) 3342 2210 | Copyright © 2006-2024 - UFRN - sigaa10-producao.info.ufrn.br.sigaa10-producao