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Prato, Rafael A and Van Vught, Vincent and Eggermont, Sam and Pozo, Guillermo and Marín Palacios, María Pilar and Fransaer, Jan and Dominguez-Benetton, Xochitl (2019) Gas diffusion electrodes on the electrosynthesis of controllable iron oxide nanoparticles. Scientific reports, 9 . ISSN 2045-2322
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Official URL: http://dx.doi.org/10.1038/s41598-019-51185-x
Abstract
The electrosynthesis of iron oxide nanoparticles offers a green route, with significant energy and environmental advantages. Yet, this is mostly restricted by the oxygen solubility in the electrolyte. Gas-diffusion electrodes (GDEs) can be used to overcome that limitation, but so far they not been explored for nanoparticle synthesis. Here, we develop a fast, environmentally-friendly, room temperature electrosynthesis route for iron oxide nanocrystals, which we term gas-diffusion electrocrystallization (GDEx). A GDE is used to generate oxidants and hydroxide in-situ, enabling the oxidative synthesis of a single iron salt (e.g., FeCl_2) into nanoparticles. Oxygen is reduced to reactive oxygen species, triggering the controlled oxidation of Fe^(2+) to Fe^(3+), forming Fe_(3-x)O_(4-x) (0 <= x <= 1). The stoichiometry and lattice parameter of the resulting oxides can be controlled and predictively modelled, resulting in highly-defective, strain-heavy nanoparticles. The size of the nanocrystals can be tuned from 5 nm to 20 nm, with a large saturation magnetization range (23 to 73 A m^2 kg^(-1)), as well as minimal coercivity (similar to 1 kA m^(-1)). Using only air, NaCl, and FeCl_2, a biocompatible approach is achieved, besides a remarkable level of control over key parameters, with a view on minimizing the addition of chemicals for enhanced production and applications.
Item Type: | Article |
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Additional Information: | ©2019 Nature Publishing Group |
Uncontrolled Keywords: | Magnetite nanoparticles; X-ray; Size; Quantification; Behavior; Defects; Oxygen |
Subjects: | Sciences > Physics > Materials Sciences > Physics > Solid state physics |
ID Code: | 58641 |
Deposited On: | 28 Jan 2020 18:36 |
Last Modified: | 21 Apr 2020 17:47 |
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