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Direct Z-scheme among Niobium Pentoxide and Poly(heptazine imide) for NH3 Photoelectrosynthesis under Ambient Conditions

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Autor(es):
Blaskievicz, Sirlon F. ; Teixeira, Ivo Freitas ; Mascaro, Lucia Helena ; de Brito, Juliana Ferreira
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: CHEMCATCHEM; v. N/A, p. 10-pg., 2023-01-26.
Resumo

There is a crescent need to improve well-known processes to environmentally friendly options, and NH3 production is not an exception. Herein, we describe the photoelectrochemical nitrogen reduction reaction under a carbon nitride, the poly(heptazine imide) (PHI) using mild conditions for NH3 synthesis. For this purpose, PHI was combined with Nb2O5 nanotubes, leading to a new photocathode with a charge transfer process in a Z-scheme structure. The photoelectrocatalytic N-2 reduction was carried out in Nb(2)O(5)Nt/PHI using solar-simulated radiation and with an applied bias of -0.3 V-Ag/AgCl. The PHI presence in the photocathode showed not only superior stability compared to bare Nb2O5, but also an ammonia generation rate of 0.156 mmol L-1 h(-1) cm(-2), which is about 10-fold higher than the amount obtained with niobium oxide alone. The mild and green conditions employed for ammonia generation place the obtained photocathode as a promising option for the currently used Haber-Bosch process. (AU)

Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
Beneficiário:Elson Longo da Silva
Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 18/02950-0 - Redução fotoeletrocatalítica de N2 a NH3 em reator fotoeletroquímico com fotoânodo direcionador de elétrons de Nb2O5/Pt e cátodo de GDL decorado com Fe, Co e Sb2Se3
Beneficiário:Juliana Ferreira de Brito
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
Beneficiário:Ana Flávia Nogueira
Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia