Fabrication and Catalytic Activity of Pt/Ni/Fe Trimetallic Nanoparticles for Hydrogen Generation from NaBH4†

doi:10.7503/cjcu20140362

Abstract

Abstract:

Poly-(N-vinyl-2-pyrrolidone)(PVP)-protected Pt/Ni/Fe trimetallic nanoparticles(TNPs) were prepared using a chemical co-reduction method. The obtained TNPs were characterized by transmission electron microscopy(TEM). The effects of metal compositions on the hydrolysis reaction of the alkaline NaBH₄ solution were studied. The results indicated that the prepared Pt/Ni/Fe TNPs had an average size of 2 nm. The activities of TNPs were much higher than that of Fe, Ni and Pt monometallic nanoparticles(MNPs) and Ni/Fe, Pt/Fe and Pt/Ni bimetallic nanoparticles(BNPs). Among all the synthesized MNPs, BNPs and TNPs, Pt/Ni/Fe TNPs with molar ratio of 10∶78.75∶11.25 displayed the highest catalytic activity, showing a high hydrogen release rate of 63.920×10³ mo $l H 2$ /(mol_Pt·h) at 30 ℃. The corresponding apparent activation energy for the hydrolysis reaction of the alkaine NaBH₄ solution over the Pt₁₀Ni_87.75F $e 1 1.25$ TNP is about 52 kJ/mol. In addition, the prepared Pt/Ni/Fe TNPs had a good catalytic stability, which kept a high activity even after 10-run catalytic evaluation.

Key words: Pt/Ni/Fe trimetallic nanoparticles, Hydrogen generation from NaBH4, Catalytic activity, Poly(N-vinyl-2-pyrroli-done)

CLC Number:

O643.36

TrendMD:

LI Wenqi, ZHAO Wanguo, ZHOU Xingyun, SU Li, ZHANG Haijun, LU Lilin, ZHANG Shaowei. Fabrication and Catalytic Activity of Pt/Ni/Fe Trimetallic Nanoparticles for Hydrogen Generation from NaB $H 4 †$ [J]. Chem. J. Chinese Universities, 2014, 35(10): 2164.

Figures/Tables 8

Fig.1 TEM images of Pt/Ni/Fe nanosols (A) Pt; (B) Pt20Ni80; (C) Pt20Ni70Fe10; (D) Pt10Ni87.75Fe11.25.

Fig.2 Size distribution histograms of Pt/Ni/Fe nanosols (A) Pt; (B) Pt20Ni80; (C) Pt20Ni70Fe10; (D) Pt10Ni87.75Fe11.25.

Fig.3 Catalytic activities of Fe, Pt and Ni monometallic nanoparticles, Ni/Fe, Pt/Fe and Pt/Ni bimetallic nanoparticles, Pt20Ni70Fe10 trimetallic nanoparticles and a physical mieture of Pt, Ni and Fe nanoparticles(20∶70∶10, molar ratio)

Fig.4 Influence of Ni/Fe composition on the hydrogen generation from the hydrolysis reaction of alkaline NaBH4 solution of Pt/Ni/Fe trimetallic nanoparticles a. Pt/Ni; b. Pt20Ni70Fe10; c. Pt20Ni60Fe20; d. Pt20Ni40Fe40; e. Pt20Ni30Fe50; f. Pt/Fe.

Fig.5 DFT calculations of electronic structure of Pt12Ni37Fe6 TNPs Orange, Fe; blue, Pt; green, Ni.

Fig.6 Influence of metal composition on the hydrogen generation from the hydrolysis reaction of alkaline NaBH4 solution of Pt/Ni/Fe trimetallic nanoparticles with n(Ni)/n(Fe)=7/1 Molar ratio of Pt/Ni/Fe: a. 0∶87.5∶12.5; b. 5∶83.125∶11.875; c. 10∶87.75∶11.25; d. 15∶74.375∶10.625; e. 20∶70∶10. The unit of catalytic activity of Ni/Fe nanoparticle is mo l H 2 ·mo l cat - 1 ·h-1.

Fig.7 Long-term activity from hydrolysis reaction of NaBH4 solution catalyzed by Pt10Ni87.75Fe11.25 nanosol

Fig.8 Linear fit of lnk vs. T-1 of Pt10Ni87.75Fe11.25 catalyst for hydrogen generation from NaBH4

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