Electrocatalytic Performance of Highly Loaded PtNi Intermetallic Nanoparticles for Oxygen Reduction†

doi:10.7503/cjcu20150303

Abstract

Abstract:

PtNi/C disordered alloy nanoparticles, synthesized in ethylene glycol solution, were annealed and converted into ordered PtNi/C intermetallic nanoparticles. Such an ordered intermetallic PtNi/C catalyst showed enhanced specific activity and mass activity, which were about 2.3 and 1.66 times those of Pt/C for the oxygen reduction reaction(ORR), in comparison with the Pt/C catalyst. After accelerated stress tests(ASTs), the ORR mass activity of the Pt/C and PtNi/C intermetallic nanoparticles decreased to 88.92% and 36.95% of the initial values, respectively; and the mass activity of PtNi/C intermetallic nanoparticles after ASTs was equivalent to the initial one of the Pt/C catalyst. The enhanced ORR activity and durability of the PtNi/C intermetallic nanoparticles could be attributed to the ordered atomic configuration and the increased content of zero valence metal on the surface of nanoparticles. Moreover, the ordered PtNi/C intermetallic nanoparticles exhibited higher methanol tolerance during the ORR than the Pt/C catalyst.

Key words: Oxygen reduction, PtNi intermetallic nanoparticles, Electrocatalyst, High durability

CLC Number:

O646

TrendMD:

HUANG Qinghong, ZOU Liangliang, ZHOU Yi, ZOU Zhiqing, ZHANG Xiaogang, YANG Hui. Electrocatalytic Performance of Highly Loaded PtNi Intermetallic Nanoparticles for Oxygen Reduction^†[J]. Chem. J. Chinese Universities, 2015, 36(10): 1961.

Figures/Tables 9

Fig.1 Structures of PtNi alloy(A) and PtNi intermetallic compound(B)

Fig.2 XRD patterns of JM Pt/C(a), PtNi/C(b) and PtNi/C-450(c)

Fig.3 TEM images(A, B) and particles size distributions(C, D) of PtNi/C(A, C) and PtNi/C-450(B, D)Insets in (A) and (B) show the HRTEM images of the corresponding samples.

Fig.4 XPS spectra of Ni2p(A, B) and Pt4f(C, D) for the PtNi/C(A, C) and PtNi/C-450(B, D)

Fig.5 Cyclic voltammograms at a scan rate of 50 mV/s(A) and CO stripping voltammograms at a scan rate of 20 mV/s(B) of the JM Pt/C(a, a'), PtNi/C(b, b') and PtNi/C-450(c, c') catalysts in N2-saturated 0.5 mol/L HClO4 solution(B) a—c. the first cycle; a'—c'. the second cycle.

Fig.6 Linear scan voltammograms of the JM Pt/C(a), PtNi/C(b) and PtNi/C-450(c) catalysts in O2-saturated 0.5 mol/L HClO4 solution at a scan rate of 5 mV/s with a rotating speed of 1600 r/min(A) and Tafel plots for the ORR(B)

Fig.7 LSVs of JM Pt/C(a) and PtNi/C-450(b) in O2-saturated 0.5 mol/L HClO4 +0.5 mol/L CH3OH solution at a scan rate of 5 mV/s with a rotating speed of 1600 r/minCurrent densities are normalized to the geometric surface area.

Fig.8 CVs at 50 mV/s in N2-saturated 0.5 mol/L HClO4(A) and LSVs at 5 mV/s with a rotating speed of 1600 r/min in O2-saturated 0.5 mol/L HClO4(B) of the JM Pt/C(a, b) and PtNi/C-450(c, d) before(a, c) and after(b, d) ASTs for 3000 cyclesCurrent densities are normalized to the geometric surface area.

Fig.9 Mass activities of JM Pt/C and PtNi/C-450 before and after accelerated stress tests at 0.9 V for 3000 cycles

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