Researchers at the University of Texas at Austin (UT Austin) have recently discovered that when a lithium-air battery is used under alkaline conditions, a reordered Pd3Fe/C catalyst can be used to cause an oxygen reduction reaction to enhance battery activity and durability.
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The new ordered Pd3Fe/C catalyst performs better than the disordered Pd3Fe/C, Pd/C and Pt/C catalysts.
According to the Journal of the American Chemical Society, the new Pd3Fe/C catalyst allows the lithium-air battery to cycle for more than 880 hours (220 cycles), while its round-trip overpotential increases by only 0.08 volts.
Researchers at UT Austin concluded that the new catalyst is a perfect replacement for traditional Pt/C catalysts and is used as an air cathode for alkaline electrolytes. In an ordered metal mesophase, only one atom is distributed on each crystal lattice, and the ordered phase provides predictable structural, geometric, and electronic effects.
The researchers also pointed out that the structural stability of the battery will also be enhanced due to the change in the mesophase of the metal due to the heat content in the chemical reaction, and the ordered intermetallic catalysts appear to have different catalytic properties.
UT Austin researchers are currently investigating whether Pt-based catalysts are associated with Pd-based catalysts. After a series of experiments, the researchers found that the polarization curves of ordered Pd3Fe/C and Pt/C catalysts almost overlap. It is shown that the activity of the two catalysts in the oxygen reduction reaction of the lithium-air battery is similar.
The UT Austin team also calculated that the ordered Pd3Fe/C has a maximum energy density of 11.7 mW/cm 2 and a Pt/C of 12.3 mW/cm 2 . In the first cycle, the battery over-voltage was increased to 0.9 volts using the ordered Pd3Fe/C as the oxygen reduction catalyst, and increased to 0.92 volts in the 55th cycle, while the over-voltage was increased to 0.98 volts in the 220th cycle. .
The battery using Pt/C as the oxygen reduction catalyst initially had a back-and-forth voltage of 0.9 volts and the 55th cycle increased to 1.31 volts. The above changes indicate that the ordered Pd3Fe/C catalyst significantly enhances the lithium-air battery cycle. stability.
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