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Rutile TiO2 Supported Pt as Stable Electrocatalyst for Improved Oxygen Reduction Reaction and Durability in Polymer Electrolyte Fuel Cells

机译:金红石TiO2负载的Pt作为稳定的催化剂,可改善聚合物电解质燃料电池中的氧还原反应和耐久性

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In the present study, electrochemically stable titanium dioxide with tunable phase composition as catalyst support for polymer electrolyte fuel cells (PEFCs) is described. The different TiO2 phases are prepared by heat treatment at different temperatures, followed by deposition of platinum metal nanoparticles through a colloidal method. The platinum nanoparticles deposited on rutile TiO2-800 exhibit higher oxygen reduction reaction (ORR) activity and better fuel cell performance compared to Pt supported on anatase TiO2. The structural effect, dispersion of platinum nanoparticles, and oxidation states are studied by powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), respectively. The accelerated durability test shows that platinum deposited on TiO2-800 exhibits significant enhancement in the stability and corrosion resistance. Although the initial activity of Pt deposited on TiO2-800 is lower than for Pt deposited on carbon, during accelerated durability test (ADT) it retains more than 60 % of the initial electrochemical active surface area (ECSA) even after 20,000 potential cycles. In comparison, only 10 % are left for Pt supported on carbon after 10,000 cycles.
机译:在本研究中,描述了具有可调相组成的电化学稳定的二氧化钛作为聚合物电解质燃料电池(PEFC)的催化剂载体。通过在不同温度下进行热处理,然后通过胶体方法沉积铂金属纳米颗粒,可以制备不同的TiO2相。与负载在锐钛矿型TiO2上的Pt相比,金红石型TiO2-800上沉积的铂纳米颗粒具有更高的氧还原反应(ORR)活性和更好的燃料电池性能。分别通过粉末X射线衍射(PXRD),透射电子显微镜(TEM)和X射线光电子能谱(XPS)研究了铂纳米颗粒的结构效应,分散状态和氧化态。加速耐久性试验表明,沉积在TiO2-800上的铂在稳定性和耐腐蚀性方面表现出显着增强。尽管沉积在TiO2-800上的Pt的初始活性低于沉积在碳上的Pt,但在加速耐久性试验(ADT)期间,即使经过20,000个潜在循环,它仍保留了60%的初始电化学活性表面积(ECSA)。相比之下,在10,000次循环后,碳上负载的Pt仅剩10%。

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