Preparation and Electrocatalytic Properties of Ir0.08Ti0.92O2 and Pt/Ir0.08Ti0.92O2†

doi:10.7503/cjcu20140209

Abstract

Abstract:

Ir_0.08Ti_0.92O₂ nanopowder with low Ir loading was prepared by TiN impregnation-thermal decomposition method, and then Pt/Ir_0.08Ti_0.92O₂ electrocatalyst was obtained by microwave assisted hydrothermal synthesis method. X-ray diffractometer(XRD), transmission electron microscope(TEM), energy dispersive spectrometer(EDS) and X-ray photoelectron spectrometer(XPS) were used to analysis the morphologies and composition of the products. Ir_0.08Ti_0.92O₂ showed to be stick-like nanoparticles with the diameter of 15 nm, and IrO₂ and TiO₂ formed a solid solution with rutile phase, the diameter of Pt nanoparticles on Ir_0.08Ti_0.92O₂ was 5—7 nm. Moreover, Ir/Ti molar ratio in interior support was 0.084∶0.916, whereas that on the support surface was 0.296∶0.704, indicating the surface accumulation of Ir. Polarization curves and linear sweep voltammetry(LSV) were performed to determine their electrocatalytic properties, compared with those of IrO₂ by traditional Adams-fusion method and commercial Pt/C. The results showed that the catalytic activity towards the oxygen evolution reaction(OER) was as follows: Ir_0.08Ti_0.92O₂>Pt/Ir_0.08Ti_0.92O₂>Ir $O 2$ (the former two were almost the same). However, catalytic activity of Pt/Ir_0.08Ti_0.92O₂ towards the oxygen reduction reaction(ORR) was lower than that of Pt/C, showing that a further optimization of Pt particle size was required. Therefore, Ir_0.08Ti_0.92O₂ can be used not only as a low-cost and efficient OER catalyst but also as a suitable support material, which promotes Pt/Ir_0.08Ti_0.92O₂ as a promising dual-functional catalyst with more advantage in cost, catalytic property and stability, as well as an excellent hydrogen evolution reaction(HER) catalyst in acidic medium.

Key words: Fuel cell, Water electrolysis, Regenerative fuel cell, Catalyst, Support

CLC Number:

O646

TrendMD:

WANG Qiang, WANG Rui, XU Haibo. Preparation and Electrocatalytic Properties of Ir_0.08Ti_0.92O₂ and Pt/Ir_0.08Ti_0.92 $O 2 †$ [J]. Chem. J. Chinese Universities, 2014, 35(9): 1962.

Figures/Tables 7

Fig.1 Schematic diagram for the syntheses of Ir0.08Ti0.92O2 and Pt/Ir0.08Ti0.92O2 nanopowders

Fig.2 XRD patterns of Ir0.08Ti0.92O2(a), Pt/Ir0.08Ti0.92O2(b), Pt/C(c) and IrO2(d)

Fig.3 TEM images of Ir0.08Ti0.92O2(A), Pt/Ir0.08Ti0.92O2(B), Pt/C(C) and IrO2(D)

Fig.4 XPS spectrum of Pt/Ir0.08Ti0.92O2

Fig.5 Anodic polarization curves relative to the apparent surface area(A) and the mass of IrO2(B) of Ir0.08Ti0.92O2(a), Pt/Ir0.08Ti0.92O2(b), IrO2(c) and Pt/C(d) in 0.5 mol/L H2SO4

Fig.6 Linear sweep voltammetry curves of Pt/Ir0.08Ti0.92O2(a) and Pt/C(b) in 0.5 mol/L oxygen-aerated H2SO4 before(A) and after(B) oxygen revolution reaction(1 mA/cm2, 30 min) The inset of (B) shows the chronopotentiometry curves.

Fig.7 Cathodic polarization curves of Ir0.08Ti0.92O2(a), Pt/Ir0.08Ti0.92O2(b), Pt/C(c) and IrO2(d) in 0.5 mol/L H2SO4

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Preparation and Electrocatalytic Properties of Ir_0.08Ti_0.92O₂ and Pt/Ir_0.08Ti_0.92 $O 2 †$

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