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Scalable Two-Step Synthesis of Nickel Iron Phosphide Electrodes for Stable and Efficient Electrocatalytic Hydrogen Evolution
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. (Umeå Core Facility for Electron Microscopy, UCEM)
Umeå University, Faculty of Science and Technology, Department of Chemistry. Department of Chemistry-Ångström Laboratory, Uppsala University, S-75120 Uppsala, Sweden.
2017 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 121, no 1, 284-292 p.Article in journal (Refereed) Published
Abstract [en]

The development of efficient, durable, and inexpensive hydrogen evolution electrodes remains a key challenge for realizing a sustainable H-2 fuel production via electrocatalytic water splitting. Herein, nickel-iron phosphide porous films with precisely controlled metal content were synthesized on Ti foil using a simple and scalable two-step strategy of spray-pyrolysis deposition followed by low-temperature phosphidation. The nickel-iron phosphide of an optimized Ni:Fe ratio of 1:4 demonstrated excellent overall catalytic activity for hydrogen evolution reaction (HER) in 0.5 M H2SO4, achieving current densities of -10 and -30 mA cm(-2) at overpoteritials of 101 and 123 mV, respectively, with a Tafel slope of 43 mV dec(-1). Detailed analysis obtained by X-ray diffraction, electron microscopy, electrochemistry, and X-ray photoelectron spectroscopy revealed that the superior overall HER activity of nickel iron phosphide as compared to nickel phosphide and iron phosphide was a combined effect of differences in the morphology (real surface area) and the intrinsic catalytic properties (electronic structure). Together with a long-term stability and a near-100% Faradaic efficiency, the nickel-iron phosphide electrodes produced in this study provide blueprints for large-scale H-2 production.

Place, publisher, year, edition, pages
2017. Vol. 121, no 1, 284-292 p.
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-132028DOI: 10.1021/acs.jpcc.6b09050ISI: 000392035500031OAI: oai:DiVA.org:umu-132028DiVA: diva2:1086375
Available from: 2017-04-02 Created: 2017-04-02 Last updated: 2017-04-02Bibliographically approved

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Kwong, Wai LingLee, Cheng ChooMessinger, Johannes
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Department of ChemistryDepartment of Plant Physiology
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  • apa
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