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Cationic Vacancy De...
Cationic Vacancy Defects in Iron Phosphide : A Promising Route toward Efficient and Stable Hydrogen Evolution by Electrochemical Water Splitting
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- Kwong, Wai Ling (författare)
- Uppsala universitet,Umeå universitet,Kemiska institutionen,Kemiskt Biologiskt Centrum (KBC) ; Department of Chemistry-Ångström Laboratory Molecular Biomimetics, Uppsala University,Molekylär biomimetik,Umeå University, Umeå, Sweden
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- Gracia-Espino, Eduardo (författare)
- Umeå universitet,Institutionen för fysik,Umeå University, Umeå, Sweden
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- Lee, Cheng Choo (författare)
- Umeå universitet,Institutionen för fysiologisk botanik,Umeå University, Umeå, Sweden
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- Sandström, Robin (författare)
- Umeå universitet,Institutionen för fysik,Umeå University, Umeå, Sweden
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- Wågberg, Thomas (författare)
- Umeå universitet,Institutionen för fysik,Umeå University, Umeå, Sweden
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- Messinger, Johannes (författare)
- Uppsala universitet,Umeå universitet,Kemiska institutionen,Kemiskt Biologiskt Centrum (KBC) ; Department of Chemistry-Ångström Laboratory Molecular Biomimetics, Uppsala University,Molekylär biomimetik,Umeå University, Umeå, Sweden
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(creator_code:org_t)
- 2017-10-27
- 2017
- Engelska.
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Ingår i: ChemSusChem. - : Wiley-Blackwell. - 1864-5631 .- 1864-564X. ; 10:22, s. 4544-4551
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- artificial photosynthesis
- cation vacancy
- iron phosphide
- sacrificial dopant
- solar fuels
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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