Ionic Liquid-assisted Synthesis of AuPd Nanosponges and Their Catalytic Performance †

doi:10.7503/cjcu20190436

Abstract

Abstract:

With the assistance of a functionalized ionic liquid, 1-hydroxyethyl-3-methylimidazolium chloride([HEmim]Cl), the porous sponge-like AuPd nanomaterials was quickly one-pot synthesized in aqueous solution at room temperature. Using field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM), X-ray energy spectroscopy(EDX) and X-ray diffraction(XRD), the structures and composition of as-prepared sponge-like AuPd nanomaterials were characterized and analyzed. The results show that the AuPd nanosponges have alloy structures and are formed via the aggregation and fusion of roughed nanoparticles. With different molar ratios of HAuCl₄ and Na₂PdCl₄ precursors(3∶1, 1∶1 or 1∶3), all the products prepared have sponge-like alloy structures. The ionic liquid plays an important role for the construction of AuPd sponge-like structures. Futhermore, all the as-obtained AuPd nanosponges exhibit excellent catalytic performance than commercial Pd/C in the reaction of p-nitrophenol reduction, in which the Au₁Pd₃ nanosponges have the highest catalytic activity. In the presence of Au₁Pd₃ nanosponges, the reaction can be finished within only 98 s and the reaction rate constant is calculated to be 0.0143 s ^-1, which is 2.3 times higher than commercial Pd/C. Yet, the current protocol can be used to grow and assemble other bi-metallic(such as PdCu and PtCu) and multi-metallic nanosponges.

Key words: Ionic liquid, AuPd alloys, Nanosponge, p-Nitrophenol reduction

CLC Number:

O614
O643

TrendMD:

WANG Nan,YAO Kaisheng,ZHAO Chenchen,LI Tianjin,LU Weiwei. Ionic Liquid-assisted Synthesis of AuPd Nanosponges and Their Catalytic Performance ^†[J]. Chem. J. Chinese Universities, 2020, 41(1): 62.

Figures/Tables 8

Fig.1 FESEM images of AuPd nanosponges with different magnifications (A), (D) Au3Pd1; (B), (E) Au1Pd1; (C), (F) Au1Pd3.

Fig.2 TEM and HRTEM images of AuPd nanosponges with different magnifications (A), (D), (G) Au3Pd1; (B), (E), (H) Au1Pd1; (C), (F), (I) Au1Pd3. Insets of (D), (E) and (F) show their SAED patterns, respectively.

Fig.3 EDX spectra of AuPd nanosponges (A) Au3Pd1; (B) Au1Pd1; (C) Au1Pd3.

Fig.4 N2 adsorption-desorption isotherms(A—C) and pore size distributions(D—F) of AuPd nanosponges (A), (D) Au3Pd1; (B), (E) Au1Pd1; (C), (F) Au1Pd3.

Fig.5 XRD patterns of AuPd nanosponges with different Au/Pd molar ratios a. Au3Pd1; b. Au1Pd1; c. Au1Pd3; d. Pd(JCPDS No.05-0681); e. Au(JCPDS No.04-0784).

Fig.6 FESEM images of AuPd products synthesized in the presence of [C2mim]Cl with different magnifications

Fig.7 Time-dependent absorption spectra for the reduction of p-nitrophenol in the presence of various catalysts (A) Au3Pd1; (B) Au1Pd1; (C) Au1Pd3; (D) commercial Pd/C.

Fig.8 Linear relationships of -ln(At/A0) vs. time in the presence of various catalysts for the reduction of p-nitrophenol

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