Intermetallic compound catalyst and preparation method thereof
An intermetallic compound and catalyst technology, applied in the field of intermetallic compound catalyst and its preparation, can solve the problems of easy melting, reduced durability and catalytic activity, etc.
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[0098] Further provided is an intermetallic catalyst 30 made by the method of making an intermetallic catalyst as described herein.
[0099] The intermetallic compound catalyst 30 may include an intermetallic compound core 210 of transition metals and noble metals, and a noble metal skin layer 220 surrounding the intermetallic compound core 210 .
[0100] According to the method of preparing the intermetallic compound catalyst 30 as described herein, since the core-shell particles 20 formed by irradiating with ultrasonic waves include a transition metal in the core, the intermetallic compound catalyst 30 obtained by annealing the same includes exposure to the catalyst noble metal particles on the outer surface to provide a noble metal skin layer 220 in which the noble metal particles are dispersed on the surface of the intermetallic compound catalyst 30 at a high density.
[0101] Typically, since the slurry preparation process for electrode formation is performed at a pH of l...
Embodiment 1 to Embodiment 4
[0115] Platinum acetylacetonate (or Pt(acac) 2 ), iron acetylacetonate (or Fe(acac) 3 ) and a porous carbon support (VulcanXC72) were added to ethylene glycol to prepare the precursor mixture using a tip-type ultrasonic wave (Sonic and Materials, model VC-500, amplitude 30%, 13 mm solid probe, 20 kHz) under an argon atmosphere. An output of 150 W irradiated 100 mL of the precursor mixture with ultrasound for 3 hours to provide core-shell particles comprising a transition metal oxide coating.
[0116] At this time, the addition amounts of the noble metal precursor and the transition metal precursor are adjusted so that the atomic ratio of the noble metal to the transition metal can be 1:0.5, 1:1.0, 1:1.5 and 1:2.0, respectively.
[0117] The prepared core-shell particles were 2 Annealing at a temperature of 800° C. for 2 hours in a / Ar mixed gas atmosphere provides intermetallic particles including transition metal oxide coatings.
[0118] Mix the intermetallic particles wit...
experiment Embodiment 1
[0123] Experimental Example 1: XRD Analysis of Intermetallic Compound Catalysts
[0124] For the PtFe of Example 3 0.5 / C was subjected to in situ XRD analysis and the results are shown in figure 2 .
[0125] like figure 2 As shown, XRD peaks (about 33 and about 53 degrees) corresponding to the intermetallic compounds are formed starting from 600°C, and then the intensity of the peaks increases with increasing temperature, but finally remains unchanged from a temperature of 800°C.
[0126] Furthermore, for the intermetallic compound catalysts (PtFe) according to Examples 1 to 4 0.2 / C, PtFe 0.3 / C, PtFe 0.5 / C and PtFe 0.6 / C) In situ XRD analysis was performed, and the results are shown in image 3 .
[0127] like image 3 As shown, the (111) peak shifts to higher angles with increasing Fe content in the intermetallic catalyst. The reason is that the mixed amount of Fe in the Pt lattice increases. In addition, the (110) peak corresponding to the intermetallic com...
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