Phosphorization of α-Fe₂O₃ boosts active hydrogen mediated electrochemical nitrate reduction to ammonia

dc.contributor.authorHou, Zhiang
dc.contributor.authorZhang, Yixuan
dc.contributor.authorChen, Hao
dc.contributor.authorWang, Jinnan
dc.contributor.authorLi, Aimin
dc.contributor.authorCorvini, Philippe
dc.date.accessioned2025-01-20T12:44:37Z
dc.date.issued2024-09-25
dc.description.abstractInexpensive iron-based materials are considered promising electrocatalysts for nitrate (NO₃</sup>−</sup>) reduction, but their catalytic activity and spontaneous corrosion remain challenges. Here, the α-Fe₂O₃ active surface is reconstructed by gradient phosphorization to obtain FePₓ with higher electrochemical activity. FeP₂.₀ optimizes the adsorption energy of NO₃- and its reduction intermediates, meanwhile promote the generation of active hydrogen (*H) but inhibit its generation of H₂. More importantly, Fe and P can serve as binding sites for NO₃- and *H, respectively, which improves the electron utilization of NO₃- deoxygenation and the efficiency of the subsequent hydrogenation for the selective synthesis of NH₃. 91.7% NO₃- conversion rate is achieved for the reduction of 100 mL 200 mg L-¹ NO₃</sup>−</sup>−N, 99.3% ammonia (NH₃ selectivity (yield of 1.79 mg h</sup>−</sup>¹ cm</sup>−2</sup>), and 91.4% Faraday efficiency in 3 h. The high-purity solid NH₄Cl is finally extracted by gas extraction and vacuum distillation (81.4% recovery). This study provides new insights and strategies for the conversion of NO₃</sup>−</sup> to NH₃ products over iron-based electrocatalysts.
dc.identifier.doi10.1002/smll.202406424
dc.identifier.issn1613-6810
dc.identifier.issn1613-6829
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/49818
dc.issue50
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofSmall
dc.subject.ddc500 - Naturwissenschaften
dc.titlePhosphorization of α-Fe₂O₃ boosts active hydrogen mediated electrochemical nitrate reduction to ammonia
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume20
dspace.entity.typePublication
fhnw.InventedHereYes
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.affiliation.hochschuleHochschule für Life Sciences FHNWde_CH
fhnw.affiliation.institutInstitut für Ecopreneurshipde_CH
fhnw.openAccessCategoryClosed
fhnw.pagination2406424
fhnw.publicationStatePublished
relation.isAuthorOfPublicationb70a3a4f-d739-4ef3-84c8-cab8e28c05c7
relation.isAuthorOfPublication.latestForDiscoveryb70a3a4f-d739-4ef3-84c8-cab8e28c05c7
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