Preparation of Pt Hollow Nanoparticles Using Ag as the Template and Electrocatalytic Performance for Methanol Oxidation†

doi:10.7503/cjcu20140130

Abstract

Abstract:

Ag nanoparticles with two different particle sizes and uniform size-distribution were prepared at 18 ℃ by adjusting the adding amount of the NaOH solution, using silver nitrate as the precursor, polyvinylpyrrolidone(PVP) as the surfactant, ascorbic acid(AA) as the reductant. Pt hollow(Pt_hollow) nanospheres with different shell thicknesses and modified glassy carbon(GC) electrode(Pt_hollow/GC) were synthesized by adjusting the amount of precursor H₂PtCl₆·6H₂O at room temperature, using Ag colloids as the template. The morphology, composition and structure of Pt_hollow were characterized by scanning electron microscopy(SEM), high resolution transmission electron microscopy(HRTEM), energy-dispersive X-ray spectroscopy(EDS), X-ray diffraction(XRD) and other detection techniques; the electrocatalytic oxidation activity of Pt_hollow/GC, Pt solid nanoparticle modified GC(Pt_nano/GC) electrode were studied and compared using methanol as a probe molecule. The results show that the Pt_hollow nanospheres have a uniform particle size and good dispersity, and the electrocatalytic oxidation activity of Pt_hollow/GC for methanol is significantly higher than that of Pt_nano/GC electrode.

Key words: Ag template, Ag@Pt nanoparticles, Pthollow nanoparticles, Electrocatalytic oxidation

CLC Number:

O646

TrendMD:

XIONG Ting, LIN Jianyun, SHANG Zhongjin, ZHANG Xiantu, LIN Xuan, TIAN Wei, ZHONG Qiling, REN Bin. Preparation of Pt Hollow Nanoparticles Using Ag as the Template and Electrocatalytic Performance for Methanol Oxidation^†[J]. Chem. J. Chinese Universities, 2014, 35(11): 2460.

Figures/Tables 6

Fig.1 SEM images(A, B) and size distributions(C, D) of as-prepared Ag nanoparticles V(NaOH)/mL: (A, C) 1.8; (B, D) 2.0.

Fig.2 SEM images(A, B) and size distributions(C, D) of (Pt-Ag)hollow with different shell thickness synthesized with Pt/Ag molar ratios of 1:1(A, C) and 2:1(B, D) Inset in (B) is the HRTEM image of (Pt-Ag)hollow.

Fig.3 EDS spectrum and TEM image of (Pt-Ag)hollow nanospheres

Fig.4 XRD pattern of (Pt-Ag)hollow nanospheres

Fig.5 CVs of(Pt-Ag)hollow/GC(A), Pthollow/GC(a) and Ptnano/GC(b)(B) electrodes in 0.5 mol/L H2SO4 solution(scan rate: 50 mV/s)

Fig.6 CVs(A) and I-t curves(B) of Pthollow/GC(a) and Ptnano/GC(b) electrodes in 0.1 mol/L CH3OH +0.1 mol/L H2SO4 solution Scan rate: 50 mV/s. Inset shows the potential step process.

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