Noble metal@Pd epitaxial heterostructure electrocatalyst, and preparation method and application thereof
A heterostructure, electrocatalyst technology, applied in the direction of structural parts, circuits, electrical components, etc., can solve the problems of reduced stability, inability to achieve high catalytic activity stability, agglomeration, etc., and achieve the effect of good stability
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[0032] Further, the preparation method includes: dissolving Pd nanosheets and noble metal salts in ethylene glycol and an aqueous solution, and putting them into an autoclave for hydrothermal reaction after dissolving; wherein, the noble metal salts are selected from IrCl 3 , Ir(OAc) 3 、H 2 PtCl 6 ·6H 2 O, K 2 PtCl 6 、H 3 RhCl 6 , AgCl, AgNO 3 、RuCl 3 ; Preferably, the noble metal salt is IrCl 3 , the purpose is to obtain Ir@Pd epitaxial heterostructure electrocatalysts with better catalytic effect.
[0033] Further, the noble metal salt is IrCl 3 , the molar ratio of Ir to Pd is 1:1.2-7, preferably 1:2.7; or, the temperature of the hydrothermal reaction is 160-200°C, preferably 180°C; or, the time of the hydrothermal reaction It is 1-4h, preferably, it is 2h. The control of Ir epitaxial growth on Pd nanosheets is the key, choose ethylene glycol as both solvent and reducing agent, control the IrCl 3 The dosage and the conditions of the hydrothermal reaction are be...
Embodiment 1
[0039] An Ir@Pd epitaxial heterostructure electrocatalyst, the preparation method is as follows:
[0040] Synthesis of Pd nanosheets:
[0041] Pd(acac) 2 (20mg) and TOPO (260mg) were added to caprylic acid (16mL), placed in a 50mL round bottom flask, ultrasonically treated for 2min, in a water bath at 60°C, N 2 Under the protection of magnetic stirring 0.5h. Then add Mo(CO) respectively 6 20mg and DMF3mL. The above mixture was stirred for another 1 h, and the color of the solution changed from light yellow to dark blue after 10 min, indicating that the palladium ion was reduced. After reacting for 1 h, the final product was collected, centrifuged at 10,000 rpm for 3 min, washed with deionized water and ethanol several times, and freeze-dried.
[0042] Ir heterostructures (Ir@Pd) bounded by Pd nanosheets (Pd NSs) were synthesized by the ethylene glycol reduction method:
[0043] Preparation of Ir@Pd epitaxial heterostructure: add 4mg Pd into 30mL ethylene glycol and aque...
Embodiment 2
[0046] An Ir@Pd epitaxial heterostructure electrocatalyst, the preparation method is as follows:
[0047] Synthesis of Pd nanosheets:
[0048] Pd(acac) 2 (20mg) and TOPO (260mg) were added to caprylic acid (16mL), placed in a 50mL round bottom flask, ultrasonically treated for 2min, in a water bath at 60°C, N 2 Under the protection of magnetic stirring 0.5h. Then add Mo(CO) respectively 6 20mg and DMF3mL. The above mixture was stirred for another 1 h, and the color of the solution changed from light yellow to dark blue after 10 min, indicating that the palladium ion was reduced. After reacting for 1.5 h, the final product was collected, centrifuged at 10,000 rpm for 3 min, washed with deionized water and ethanol several times, and freeze-dried.
[0049] Ir heterostructures (Ir@Pd) bounded by Pd nanosheets (Pd NSs) were synthesized by the ethylene glycol reduction method:
[0050] Preparation of Ir / @Pd epitaxial heterostructure: add 4mg Pd to 30mL ethylene glycol and aque...
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