Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/10216/140909 |
Resumo: | Transition metal (oxy)nitrides are attractive materials due to their notable catalytic and electronic properties. Vanadium (oxy)nitrides, in particular, have generated high interest due to their wide applicability in heterogeneous catalysis, energy-related research (e.g., supercapacitors), and superconductors. One of the most promising ways to synthesize these materials is by ammonolysis. However, thermodynamic calculations predict that the chemical potentials of both the nitrogen and hydrogen precursors are dependent on the synthesis temperature, potentially influencing the N/O ratio of the formed (oxy)nitride. The current work, therefore, clarifies the effect of ammonolysis temperature on the (oxy)nitride composition and resultant physical properties. A series of vanadium (oxy)nitrides are formed by reacting V2O5 with gaseous ammonia in the temperature range 600-1000 °C. The synthesized materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry (TGA), and X-ray photoelectron spectroscopy (XPS). The unit cell volume of the crystal is shown to increase with ammonolysis temperature, being concomitant with increased nitrogen incorporation. Kinetic analysis was performed by isoconversional and model-based methods, showing that the amount of incorporated nitrogen has a strong impact on materials stability, beneficially increasing the resistance towards oxidation. The work demonstrates that it is possible to compositionally tune the anionic sublattice of vanadium (oxy)nitride by controlling the ammonolysis temperature, where this method can be used as a tool to tailor resultant properties towards potential applications. |
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Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditionsQuímica, Engenharia químicaChemistry, Chemical engineeringTransition metal (oxy)nitrides are attractive materials due to their notable catalytic and electronic properties. Vanadium (oxy)nitrides, in particular, have generated high interest due to their wide applicability in heterogeneous catalysis, energy-related research (e.g., supercapacitors), and superconductors. One of the most promising ways to synthesize these materials is by ammonolysis. However, thermodynamic calculations predict that the chemical potentials of both the nitrogen and hydrogen precursors are dependent on the synthesis temperature, potentially influencing the N/O ratio of the formed (oxy)nitride. The current work, therefore, clarifies the effect of ammonolysis temperature on the (oxy)nitride composition and resultant physical properties. A series of vanadium (oxy)nitrides are formed by reacting V2O5 with gaseous ammonia in the temperature range 600-1000 °C. The synthesized materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry (TGA), and X-ray photoelectron spectroscopy (XPS). The unit cell volume of the crystal is shown to increase with ammonolysis temperature, being concomitant with increased nitrogen incorporation. Kinetic analysis was performed by isoconversional and model-based methods, showing that the amount of incorporated nitrogen has a strong impact on materials stability, beneficially increasing the resistance towards oxidation. The work demonstrates that it is possible to compositionally tune the anionic sublattice of vanadium (oxy)nitride by controlling the ammonolysis temperature, where this method can be used as a tool to tailor resultant properties towards potential applications.20222022-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/10216/140909por2050-752610.1039/d2tc00545jLaura I. V. HolzVanessa C. D. GraçaFrancisco J. A. LoureiroSergey M. MikhalevDiogo MendesAdélio MendesDuncan P. Fagginfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-29T12:26:18Zoai:repositorio-aberto.up.pt:10216/140909Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T23:20:20.158591Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions |
title |
Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions |
spellingShingle |
Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions Laura I. V. Holz Química, Engenharia química Chemistry, Chemical engineering |
title_short |
Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions |
title_full |
Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions |
title_fullStr |
Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions |
title_full_unstemmed |
Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions |
title_sort |
Tailoring the anion stoichiometry and oxidation kinetics of vanadium (oxy)nitride by the control of ammonolysis conditions |
author |
Laura I. V. Holz |
author_facet |
Laura I. V. Holz Vanessa C. D. Graça Francisco J. A. Loureiro Sergey M. Mikhalev Diogo Mendes Adélio Mendes Duncan P. Fagg |
author_role |
author |
author2 |
Vanessa C. D. Graça Francisco J. A. Loureiro Sergey M. Mikhalev Diogo Mendes Adélio Mendes Duncan P. Fagg |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Laura I. V. Holz Vanessa C. D. Graça Francisco J. A. Loureiro Sergey M. Mikhalev Diogo Mendes Adélio Mendes Duncan P. Fagg |
dc.subject.por.fl_str_mv |
Química, Engenharia química Chemistry, Chemical engineering |
topic |
Química, Engenharia química Chemistry, Chemical engineering |
description |
Transition metal (oxy)nitrides are attractive materials due to their notable catalytic and electronic properties. Vanadium (oxy)nitrides, in particular, have generated high interest due to their wide applicability in heterogeneous catalysis, energy-related research (e.g., supercapacitors), and superconductors. One of the most promising ways to synthesize these materials is by ammonolysis. However, thermodynamic calculations predict that the chemical potentials of both the nitrogen and hydrogen precursors are dependent on the synthesis temperature, potentially influencing the N/O ratio of the formed (oxy)nitride. The current work, therefore, clarifies the effect of ammonolysis temperature on the (oxy)nitride composition and resultant physical properties. A series of vanadium (oxy)nitrides are formed by reacting V2O5 with gaseous ammonia in the temperature range 600-1000 °C. The synthesized materials are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry (TGA), and X-ray photoelectron spectroscopy (XPS). The unit cell volume of the crystal is shown to increase with ammonolysis temperature, being concomitant with increased nitrogen incorporation. Kinetic analysis was performed by isoconversional and model-based methods, showing that the amount of incorporated nitrogen has a strong impact on materials stability, beneficially increasing the resistance towards oxidation. The work demonstrates that it is possible to compositionally tune the anionic sublattice of vanadium (oxy)nitride by controlling the ammonolysis temperature, where this method can be used as a tool to tailor resultant properties towards potential applications. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022 2022-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://hdl.handle.net/10216/140909 |
url |
https://hdl.handle.net/10216/140909 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
2050-7526 10.1039/d2tc00545j |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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