Ir0.08Ti0.92O2及其载Pt催化剂的制备与电催化性能

doi:10.7503/cjcu20140209

摘要/Abstract

摘要：

采用TiN浸渍热分解法制备了低铱含量Ir_0.08Ti_0.92O₂纳米粉体, 再通过微波辅助制备Pt/Ir_0.08Ti_0.92O₂催化剂, 并与采用传统亚当斯法制备的IrO₂和商品化Pt/C进行对比研究. 利用X射线衍射(XRD)、透射电子显微镜(SEM)、 X射线能量散射谱(EDS)和X射线光电子能谱(XPS)对产物进行了分析. 结果表明, Ir_0.08Ti_0.92O₂是一种纳米棒状金红石相固溶体, 直径约15 nm, 担载Pt粒度5~7 nm, 其中本体Ir/Ti原子比为0.084∶0.916, 表面Ir/Ti原子比为0.296∶0.704, 表明Ir在表面发生富集. 经稳态极化曲线和线性扫描伏安测试得到析氧反应的本征催化活性由高到低为Ir_0.08Ti_0.92O₂>Pt/Ir_0.08Ti_0.92O₂>IrO₂, 前两者性能相近; Pt/Ir_0.08Ti_0.92O₂的氧还原反应活性低于Pt/C, 需进一步优化载Pt粒度. 研究结果表明, Ir_0.08Ti_0.92O₂既是高效、低成本的析氧反应催化剂, 也是高性能载体材料, 这使Pt/Ir_0.08Ti_0.92O₂作为双效催化剂在成本、催化性能和稳定性上具有更大优势, 也可作为优异的析氢反应催化剂.

关键词: 燃料电池, 水电解, 可再生燃料电池, 催化剂, 载体

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

中图分类号:

O646

TrendMD:

王强, 王锐, 徐海波. Ir_0.08Ti_0.92O₂及其载Pt催化剂的制备与电催化性能. 高等学校化学学报, 2014, 35(9): 1962.

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

图/表 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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Ir_0.08Ti_0.92O₂及其载Pt催化剂的制备与电催化性能

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

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