Recently, researchers from the University of Arkansas, Brookhaven National Lab, and Argonne National Lab published a paper in the Nanoscale magazine that stated that the production of hydrogen fuel from electrolyzed water In the process, using nanoparticles composed of nickel and iron as catalysts is more effective than other more expensive materials.
"Controlling the three-dimensional morphology of the nanocatalyst is one of the important ways to improve the slow kinetics of oxygen evolution reaction (OER) in the electrolysis process, but it has not yet been fully studied.
In our research, we discovered a scalable, petroleum-based method based on the thermal decomposition of organometallic complexes to produce highly uniform Ni-Fe-based nanocatalysts with a clear morphology (ie, Ni-Fe core-shell, Ni / Fe alloy and Fe-Ni core-shell). The morphology and composition of NiOx-feo / NiOx core-mixed shell, NiOx / FeOx alloy, FeOx-NiOx core-shell were observed by transmission electron microscope. "
Researcher Ryan Mansor introduced: "Nickel diffuses from the amorphous nickel-based core to the iron oxide shell, making the NiOx-NiOx / FeOx core-FeOx mixed shell structure the most active and stable nanocatalyst, better than the expected OER Active NiOx / FeOx alloy nanoparticles. "
Studies have shown that the chemical environment of mixed NiOx / FeOx alloy components is essential to improve the electrocatalytic activity of OER, and the three-dimensional morphology plays a key role in optimizing the electrocatalytic activity of OER and the stability of nanocatalysts.
Researcher Chen Jingyi of the University of Arkansas, Associate Professor of Physical Chemistry Lauren Greenlee, Assistant Professor of Chemical Engineering and his colleagues found that when nanoparticles composed of iron-nickel shells around the nickel-iron core were used in the process, they interacted with hydrogen It weakens the bond with the oxygen atom and improves the reaction efficiency by generating oxygen more easily. In fact, nickel and iron are also cheaper than other catalysts made of rare materials.
"Based on the thermal decomposition of organometallic complexes, we have developed a scalable, petroleum-based synthesis method that can control the morphology and crystalline phase of nickel-iron-based nanocatalysts. By sequential or simultaneous injection, we synthesized Highly uniform Ni-Fe-based nanostructures with different morphologies (ie, Ni-Fe core-shell, Ni / Fe alloy, and Fe-Ni core-shell). "
Ryan Mansor added: "The amorphous and disordered nature of the NiOx core seems to be most similar to α-Ni (OH) 2, allowing Ni to diffuse into FeOx for use in NiOx-NiOx / FeOx core mixed shell nanoparticles. Synthesis The mixed metal hydroxide / oxide shell provides the most effective and stable nanocatalyst, and its performance is better than that of NiOx / FeOx alloy nanoparticles with an expected OER activity of 1: 1.
These findings emphasize that not only the crystallinity, but also the three-dimensional morphology, phase, and chemical environment of the metal species, disorder, and composition can significantly affect the electrocatalytic activity and stability of the nanocatalyst for basic OER. "
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