Construção de fotocatalisadores heteroestruturados de Cs2AgBiBr6/bismuteno e sua aplicação para produção de combustíveis solares a partir da redução fotocatalítica de CO2
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...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/53522 |
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| Resumo: | 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–1h–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. |
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