Cationic Vacancy Defects in Iron Phosphide: A Promising Route toward Efficient and Stable Hydrogen Evolution by Electrochemical Water Splitting. Kwong, W. L., Gracia-Espino, E., Lee, C. C., Sandström, R., Wågberg, T., & Messinger, J. ChemSusChem, 10(22):4544–4551, 2017. _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/cssc.201701565![Cationic Vacancy Defects in Iron Phosphide: A Promising Route toward Efficient and Stable Hydrogen Evolution by Electrochemical Water Splitting [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex 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 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.
@article{kwong_cationic_2017,
title = {Cationic {Vacancy} {Defects} in {Iron} {Phosphide}: {A} {Promising} {Route} toward {Efficient} and {Stable} {Hydrogen} {Evolution} by {Electrochemical} {Water} {Splitting}},
volume = {10},
copyright = {© 2017 The Authors. Published by Wiley-VCH Verlag GmbH \& Co. KGaA.},
issn = {1864-564X},
shorttitle = {Cationic {Vacancy} {Defects} in {Iron} {Phosphide}},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/cssc.201701565},
doi = {10.1002/cssc.201701565},
abstract = {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 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.},
language = {en},
number = {22},
urldate = {2024-12-10},
journal = {ChemSusChem},
author = {Kwong, Wai Ling and Gracia-Espino, Eduardo and Lee, Cheng Choo and Sandström, Robin and Wågberg, Thomas and Messinger, Johannes},
year = {2017},
note = {\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1002/cssc.201701565},
keywords = {artificial photosynthesis, cation vacancy, iron phosphide, sacrificial dopant, solar fuels},
pages = {4544--4551},
}
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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 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. 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