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Cationic Vacancy Defects in Iron Phosphide: A Promising Route toward Efficient and Stable Hydrogen Evolution by Electrochemical Water Splitting
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Molecular Biomimetics. Umeå University, Umeå, Sweden. (Molecular Biomimetics)ORCID iD: 0000-0002-9732-8867
Umeå University, Umeå, Sweden.
Umeå University, Umeå, Sweden.
Umeå University, Umeå, Sweden.
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2017 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 10, no 22, p. 4544-4551Article in journal (Refereed) 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 Fevacancy-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 mA cm-2 at overpotentials of 108 mV in 1 m KOH and 65 mV in 0.5 m H2 SO4 , 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.

Place, publisher, year, edition, pages
2017. Vol. 10, no 22, p. 4544-4551
Keywords [en]
artificial photosynthesis, cation vacancy, iron phosphide, sacrificial dopant, solar fuels
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-336241DOI: 10.1002/cssc.201701565ISI: 000416158500031PubMedID: 28980427OAI: oai:DiVA.org:uu-336241DiVA, id: diva2:1165482
Funder
Knut and Alice Wallenberg Foundation, KAW 2011.0055Swedish Energy Agency, 36648-1Carl Tryggers foundation , CTS-16-161Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2018-09-13Bibliographically approved

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Kwong, Wai LingMessinger, Johannes

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