Perovskite ceramic oxide as an efficient electrocatalyst for nitrogen fixation

Xu, Y; Xu, X; Cao, N; Wang, X; Liu, X; Fronzi, M; Bi, L

Perovskite ceramic oxide as an efficient electrocatalyst for nitrogen fixation

Xu, Y Xu, X Cao, N Wang, X Liu, X Fronzi, M

Bi, L

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Publisher:: PERGAMON-ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: International Journal of Hydrogen Energy, 2021, 46, (17), pp. 10293-10302
Issue Date:: 2021-03-08

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Field	Value	Language
dc.contributor.author	Xu, Y
dc.contributor.author	Xu, X
dc.contributor.author	Cao, N
dc.contributor.author	Wang, X
dc.contributor.author	Liu, X
dc.contributor.author	Fronzi, M https://orcid.org/0000-0001-7855-9216
dc.contributor.author	Bi, L
dc.date.accessioned	2022-02-13T19:51:54Z
dc.date.available	2022-02-13T19:51:54Z
dc.date.issued	2021-03-08
dc.identifier.citation	International Journal of Hydrogen Energy, 2021, 46, (17), pp. 10293-10302
dc.identifier.issn	0360-3199
dc.identifier.issn	1879-3487
dc.identifier.uri	http://hdl.handle.net/10453/154450
dc.description.abstract	The electrochemical conversion of N2 to NH3 is an interesting research topic as it provided an alternative and energy-saving method compared with the traditional way of NH3 production. Although different materials have been proposed for N2 reduction, the use of defects in oxides was only reported recently and the relevant working mechanism was not fully revealed. In this study, Sr was used as the dopant for LaFeO3 to create oxygen vacancies, forming the Sr-doped LFO (La0.5Sr0.5FeO3-δ) perovskite oxide. The La0.5Sr0.5FeO3-δ ceramic oxide used as a catalyst achieves an NH3 yield of 11.51 μgh−1 mg−1 and the desirable faradic efficiency (F.E.) of 0.54% at −0.6 V vs reversible hydrogen electrode (RHE), which surpassed that of LaFeO3 nanoparticles. The 15N isotope labeling method was employed to prove the La0.5Sr0.5FeO3-δ catalyst had the function of converting N2 into NH3 under the electrolysis condition. The first principle calculations were used to investigate the mechanism at the atomistic level, revealing that the free energy barriers changed significantly with the introduction of oxygen vacancies that accelerated the overall nitrogen reduction reaction (NRR) procedure.
dc.language	English
dc.publisher	PERGAMON-ELSEVIER SCIENCE LTD
dc.relation.ispartof	International Journal of Hydrogen Energy
dc.relation.isbasedon	10.1016/j.ijhydene.2020.12.147
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 09 Engineering
dc.subject.classification	Energy
dc.title	Perovskite ceramic oxide as an efficient electrocatalyst for nitrogen fixation
dc.type	Journal Article
utslib.citation.volume	46
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access	*
dc.date.updated	2022-02-13T19:51:48Z
pubs.issue	17
pubs.publication-status	Published
pubs.volume	46
utslib.citation.issue	17

Abstract:

The electrochemical conversion of N2 to NH3 is an interesting research topic as it provided an alternative and energy-saving method compared with the traditional way of NH3 production. Although different materials have been proposed for N2 reduction, the use of defects in oxides was only reported recently and the relevant working mechanism was not fully revealed. In this study, Sr was used as the dopant for LaFeO3 to create oxygen vacancies, forming the Sr-doped LFO (La0.5Sr0.5FeO3-δ) perovskite oxide. The La0.5Sr0.5FeO3-δ ceramic oxide used as a catalyst achieves an NH3 yield of 11.51 μgh−1 mg−1 and the desirable faradic efficiency (F.E.) of 0.54% at −0.6 V vs reversible hydrogen electrode (RHE), which surpassed that of LaFeO3 nanoparticles. The 15N isotope labeling method was employed to prove the La0.5Sr0.5FeO3-δ catalyst had the function of converting N2 into NH3 under the electrolysis condition. The first principle calculations were used to investigate the mechanism at the atomistic level, revealing that the free energy barriers changed significantly with the introduction of oxygen vacancies that accelerated the overall nitrogen reduction reaction (NRR) procedure.

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http://hdl.handle.net/10453/154450