Preparation and Electrocatalytic Performance of Thin-shell Ni/Pt Core-shell Nanoparticles

doi:10.3724/SP.J.1077.2012.00095

Abstract

Abstract:

The Ni/Pt core-shell nanoparticles with different shell thicknesses were prepared by composite coating of colloid particles and then characterized by HRTEM, EDS, XPS and XRD. Electrochemical properties for the oxygen electro-reduction reaction and methanol electro-oxidation were measured by potentiodynamic and cyclic voltammetry. The experimental results show that Ni/Pt core-shell nanoparticles are spherical and the mean particle size of Ni₁-Pt_0.067 is about 7 nm with shell thickness of 1 nm. Compared with Pt/C, Ni/Pt core-shell nanoparticels possess higher activity. Ni₁-Pt_0.067/C has the highest catalytic activity in these prepared catalysts with different thickness, and its peak current density can reach 143.06 mA/mg in 0.5 mol/L H₂SO₄ solution, 1.4 times of that of Pt/C for O₂ electro-reduction reaction. Peak current density of Ni₁-Pt_0.067/C for methanol electro-oxidation reaches 538.3 mA/mg in 0.5 mol/L H₂SO₄+1.0 mol/L CH₃OH solution, which is 5.2 times of that of Pt/C. Based on 1 mg Pt, the specific mass activity of Ni₁-Pt_0.067/C is 30-fold higher than that of Pt/C nanoparticles.

Key words: Ni/Pt core-shell nanoparticle, preparation, oxygen electro-reduction, methanol electro-oxidation

CLC Number:

TM911

LIU Shi-Bin, YANG Chun-Ying, ZHANG Zhong-Lin, DUAN Dong-Hong, HAO Xiao-Gang, LI Yi-Bing. Preparation and Electrocatalytic Performance of Thin-shell Ni/Pt Core-shell Nanoparticles[J]. Journal of Inorganic Materials, 2012, 27(1): 95-101.

Figures/Tables 13

Fig. 1 TEM image of Ni1-Pt0.067 nanoparticles

Fig. 2 EDS spectra of different catalysts

Fig. 3 XRD patterns of different catalysts

Fig. 4 XPS spectra of Ni2p of different catalysts

Fig. 5 XPS spectra of Pt4f of different catalysts

Fig. 6 XPS spectra and simulated spectra of Pt4f of different catalysts

Table 1 Binding energies and atomic ratio of Ni and Pt on different catalysts surface

Catalyst	Relative intensity		Atomic ratio of Pt⁰ and Pt on surface/%	Atomic ratio of Ni and Pt on surface
Catalyst	Pt4f_7/2	Pt4f_5/2	Atomic ratio of Pt⁰ and Pt on surface/%	Atomic ratio of Ni and Pt on surface
Ni₁-Pt_0.1	70.85	74.14	61(Pt⁰)	1/0.14
Ni₁-Pt_0.1	71.74	74.67	39(Pt²⁺)	1/0.14
Ni₁-Pt_0.067	71.42	74.78	57(Pt⁰)	1/0.10
Ni₁-Pt_0.067	71.98	75.04	43(Pt²⁺)	1/0.10
Ni₁-Pt_0.05	71.09	74.42	59(Pt⁰)	1/0.08
Ni₁-Pt_0.05	71.93	74.84	41(Pt²⁺)	1/0.08
Pt	71.23	74.62	48(Pt⁰)	0/1.00
Pt	71.92	75.27	52(Pt²⁺)	0/1.00

Fig. 7 Cyclic voltammograms of Pt/C and Ni/Pt core-shell catalysts

Table 2 Electrochemical characterization of Pt/C and Ni/Pt catalysts

Catalyst	Q_d/(C·g^-1)	A_ec/(m²·g^-1)
Ni₁-Pt_0.1/C	10.11	4.86
Ni₁-Pt_0.067/C	12.77	6.14
Ni₁-Pt_0.05/C	13.42	6.45
Pt/C	10.87	5.23

Fig. 8 Potentiodynamic of Pt/C and Ni/Pt catalysts in 0.5mol/L H2SO4

Fig. 9 Specific mass activity histogram of Pt/C and Ni/Pt catalysts based on 1 mg Pt in 0.5 mol/L H2SO4 solution

Fig. 10 Cyclic voltammograms of Pt/C and Ni/Pt catalysts in 0.5 mol/L H2SO4+1.0 mol/L CH3OH solution

Fig. 11 Specific mass activity histogram of Pt/C and Ni/Pt catalysts based on 1 mg Pt in 0.5 mol/L H2SO4+1.0 mol/L CH3OH solution

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