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Carbon-Supported Pt Hollow Nanospheres as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction

机译:碳载Pt空心纳米球作为氧还原反应的高效电催化剂

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In this study, carbon black Vulcan XC-72R (VC)-supported Pt hollow nanospheres (HNSs) were prepared through a simple synthesis strategy using VC-supported Co nanoparticles (NPs) as the template combined with the replacement of Co by PtCl62- ions. The new modified synthesis method results in improved Pt distribution and performance compared to the previously reported conventional synthesis method. The as-developed Pt(20 wt%)HNS/VC catalyst has a homogenous Pt HNS particle size of ca. 18 nm and a uniform particle distribution on the VC support. Furthermore, the Pt HNSs are found to be composed of discrete Pt NPs with a crystallite size of ca. 2-3 nm. Due to the unique nanostructure and alloying with Co of the Pt HNS, the Pt(20 wt%)HNS/VC outperforms significantly a state-of-the-art Pt(20 wt%)NP/VC for the oxygen reduction reaction.
机译:在这项研究中,炭黑以Vulcan XC-72R(VC)为载体的Pt空心纳米球(HNSs)是通过简单的合成策略制备的,使用VC支撑的Co纳米颗粒(NPs)作为模板,并结合了用PtCl62-离子取代Co 。与以前报道的常规合成方法相比,新的改进的合成方法可改善Pt分布和性能。已开发的Pt(20 wt%)HNS / VC催化剂的均一Pt HNS颗粒尺寸约为50微米。 18 nm,VC载体上的颗粒分布均匀。此外,发现Pt HNS由微晶尺寸为约1μm的离散Pt NP组成。 2-3纳米由于Pt HNS的独特纳米结构和与Co的合金化,Pt(20 wt%)HNS / VC在氧还原反应方面的性能明显优于最新的Pt(20 wt%)NP / VC。

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