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Cationic Vacancy Defects in Iron Phosphide: A Promising Route toward Efficient and Stable Hydrogen Evolution by Electrochemical Water Splitting
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen. Kemiskt Biologiskt Centrum (KBC) ; Department of Chemistry-Ångström Laboratory Molecular Biomimetics, Uppsala University.ORCID-id: 0000-0002-9732-8867
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
Vise andre og tillknytning
2017 (engelsk)Inngår i: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 10, nr 22, s. 4544-4551Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Engineering the electronic properties of transition metal phosphides has shown great effectiveness in improving their intrinsic catalytic activity for the hydrogen evolution reaction (HER) in water splitting applications. Herein, we report for the first time, the creation of Fe vacancies as an approach to modulate the electronic structure of iron phosphide (FeP). The Fe vacancies were produced by chemical leaching of Mg that was introduced into FeP as "sacrificial dopant". The obtained Fe-vacancy-rich FeP nanoparticulate films, which were deposited on Ti foil, show excellent HER activity compared to pristine FeP and Mg-doped FeP, achieving a current density of 10 mAcm(-2) at overpotentials of 108 mV in 1 m KOH and 65 mV in 0.5 m H2SO4, with a near-100% Faradaic efficiency. Our theoretical and experimental analyses reveal that the improved HER activity originates from the presence of Fe vacancies, which lead to a synergistic modulation of the structural and electronic properties that result in a near-optimal hydrogen adsorption free energy and enhanced proton trapping. The success in catalytic improvement through the introduction of cationic vacancy defects has not only demonstrated the potential of Fe-vacancy-rich FeP as highly efficient, earth abundant HER catalyst, but also opens up an exciting pathway for activating other promising catalysts for electrochemical water splitting.

sted, utgiver, år, opplag, sider
Wiley-Blackwell, 2017. Vol. 10, nr 22, s. 4544-4551
Emneord [en]
artificial photosynthesis, cation vacancy, iron phosphide, sacrificial dopant, solar fuels
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-143610DOI: 10.1002/cssc.201701565ISI: 000416158500031PubMedID: 28980427OAI: oai:DiVA.org:umu-143610DiVA, id: diva2:1170832
Tilgjengelig fra: 2018-01-04 Laget: 2018-01-04 Sist oppdatert: 2018-06-09bibliografisk kontrollert

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Kwong, Wai LingGracia-Espino, EduardoLee, Cheng ChooSandström, RobinWågberg, ThomasMessinger, Johannes

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