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  • Hanifpour, Fatemeh (author)

Investigation into the mechanism of electrochemical nitrogen reduction reaction to ammonia using niobium oxynitride thin-film catalysts

  • Article/chapterEnglish2022

Publisher, publication year, extent ...

  • Elsevier,2022
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-470305
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-470305URI
  • https://doi.org/10.1016/j.electacta.2021.139551DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Niobium oxynitride (NbOxNy) thin films with varying combined non-metal vs. metal stoichiometries ( x + y ) and N/O stoichiometric ratios (y/x) are investigated for their ability to catalyze the nitrogen re-duction reaction and ammonia synthesis at ambient conditions. Electrochemical impedance spectroscopy and ammonia measurements show stark differences both in nitrogen vs. argon media on each surface and on the surfaces in the series when the combined stoichiometry of N + O vs. Nb increases. Surface stability checks at fixed intervals during the experiments and surface characterization after the experiments us -ing X-ray diffraction reveal the least changes occurred to the surface with the highest N + O stoichiometry. Based on these observations, an ammonia synthesis mechanism is proposed. Isotope labeling experiments on the most promising surface of the series, however, show no sign of catalytically produced ammonia, possibly due to the lack of stability of the surface to endure through the ammonia production cycle. 

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Canales, Camila P. (author)
  • Fridriksson, Emil G. (author)
  • Sveinbjörnsson, Arnar (author)
  • Tryggvason, Tryggvi K. (author)
  • Lewin, Erik,Dr.1979-Uppsala universitet,Oorganisk kemi(Swepub:uu)leeri169 (author)
  • Magnus, Fridrik (author)
  • Ingason, Árni S. (author)
  • Skúlason, Egill (author)
  • Flosadóttir, Helga D. (author)
  • Uppsala universitetOorganisk kemi (creator_code:org_t)

Related titles

  • In:Electrochimica Acta: Elsevier4030013-46861873-3859

Internet link

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