Preparation method and application of concave-cube PtLa alloy nanocrystalline catalyst

A technology of alloy nanocrystals and cubes, applied in direct ethanol fuel cells, concave cube PtLa alloy nanocrystal catalysts and the field of preparation thereof, to achieve improved electrocatalytic activity and stability, uniform shape and size, yield and alloy high degree of effect

Active Publication Date: 2017-06-09
GUANGXI NORMAL UNIV
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There are no literature and patent reports on the shape-controlled synthesis of concave ...

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  • Preparation method and application of concave-cube PtLa alloy nanocrystalline catalyst
  • Preparation method and application of concave-cube PtLa alloy nanocrystalline catalyst
  • Preparation method and application of concave-cube PtLa alloy nanocrystalline catalyst

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Embodiment

[0020] refer to figure 1 , to prepare concave cubic PtLa alloy nanocrystalline catalyst, take 8 mL H 2 PtCl 6 and La(NO 3 ) 3 The mixed DES solution was placed in the electrolytic cell, and the glassy carbon electrode was used as the working electrode substrate for electrochemical program square wave potential treatment at 80 °C; first, the nucleation was performed by stepping from the open circuit potential to -1.9 V for 10-120 s, Then apply a square wave potential treatment for 30 minutes (the lower limit potential of the square wave treatment is -1.75 ~ -1.5 V, the upper limit potential is -0.45 ~ -0.2 V, and the square wave frequency is 10 Hz), and the concave cubic PtLa alloy nanocrystalline catalyst can be prepared. .

[0021] SEM analysis shows that PtLa alloy nanocrystals grow monodispersely on the glassy carbon electrode substrate, and the yield of concave cubic PtLa nanocrystals is as high as 90%, the average particle size is 47.5 nm, and the shape and size of co...

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Abstract

The invention discloses a preparation method and application of a concave-cube PtLa alloy nanocrystalline catalyst. The preparation method includes: placing the mixed DES solution of H2PtCl6/La(NO3)3 with the concentration ratio being 10mM/1-10mM into an electrolytic tank, using glassy carbon electrode as the working electrode to perform electrochemical procedure square wave potential processing under 80 DEG C to obtain the concave-cube PtLa alloy nanocrystalline catalyst. The preparation method has the advantages that the simple and novel method for preparing the Pt-based rare-earth alloy nanocrystalline electrocatalyst for direct ethanol fuel batteries, the deep eutectic solvent (DES) is used as the medium for the first time, and the concave-cube PtLa alloy nanocrystalline catalyst which is uniform in form and size and has a high-index crystal face structure is prepared through the electrochemical procedure square wave potential method; the preparation method is simple in process and controllable in operation condition, the prepared nanocrystal is high in yield and alloying degree, the charge transfer interaction between Pt and La in the nanocrystalline catalyst is enhanced evidently, and electrocatalytic activity and stability of the concave-cube PtLa alloy nanocrystalline catalyst to ethanol oxidation are increased greatly.

Description

technical field [0001] The invention relates to the field of electrocatalysts and fuel cells, in particular to a concave cubic PtLa alloy nanocrystal catalyst, a preparation method thereof, and an application in direct ethanol fuel cells. Background technique [0002] At present, the anode process catalysts of direct ethanol fuel cells (DEFCs) are still dominated by Pt-based materials, but Pt resources are scarce, the cost of catalysts is high, and they are easily poisoned by some toxic intermediate species produced during the oxidation of organic fuel molecules. One of the effective ways to solve this problem is to incorporate another metal element on the basis of the active component Pt to form a Pt-based binary alloy. Through the synergistic effect between the bimetals, the electrocatalytic performance of the catalyst and the utilization of the noble metal Pt can be significantly improved. efficiency. In recent years, a large number of literatures have reported the prepa...

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Application Information

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IPC IPC(8): H01M4/92H01M8/1011
CPCH01M4/921H01M8/1011Y02E60/50
Inventor 樊友军王莉项胜孙世刚
Owner GUANGXI NORMAL UNIV
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