基于亚 2nmPt 颗粒的催化体系及其对氧还原的非凡活性和耐久性。
Catalytic System Based on Sub-2 nm Pt Particles and Its Extraordinary Activity and Durability for Oxygen Reduction.
机构信息
The Wallace H. Coulter Department of Biomedical Engineering , Georgia Institute of Technology and Emory University , Atlanta , Georgia 30332 , United States.
Institute of Nano-science and Nano-technology, College of Physical Science and Technology , Central China Normal University , Wuhan , Hubei 430079 , P. R. China.
出版信息
Nano Lett. 2019 Aug 14;19(8):4997-5002. doi: 10.1021/acs.nanolett.9b01221. Epub 2019 Jul 17.
Carbon-supported Pt nanoparticles are used as catalysts for a variety of reactions including the oxygen reduction reaction (ORR) key to proton-exchange membrane fuel cells, but their catalytic performance has long been plagued by detachment and sintering. Here we report the growth of sub-2 nm Pt particles on a commercial carbon support via the galvanic reaction between a Pt(II) precursor and a uniform film of amorphous Se predeposited on the support. The residual Se could serve as a linker to strongly anchor the Pt nanoparticles to the carbon surface, leading to a catalytic system with extraordinary activity and durability toward ORR. Even after 20 000 cycles of accelerated durability test, the sub-2 nm Pt particles were still dispersed well on the carbon support and maintained a mass activity more than three-times as high as the pristine value of a commercial Pt/C catalyst.
负载在碳上的铂纳米粒子被用作各种反应的催化剂，包括质子交换膜燃料电池的关键反应——氧还原反应（ORR），但其催化性能长期以来一直受到脱附和烧结的困扰。在这里，我们通过在载体上预先沉积的非晶态硒的均匀薄膜与铂（II）前体之间的电化学反应，在商业碳载体上生长了亚 2nm 的 Pt 颗粒。残留的硒可以作为一个连接物，将 Pt 纳米颗粒强烈地锚定在碳表面上，从而形成一种对 ORR 具有非凡活性和耐久性的催化体系。即使经过 20000 次加速耐久性测试，亚 2nm 的 Pt 颗粒仍然很好地分散在碳载体上，其质量活性仍然保持在商业 Pt/C 催化剂原始值的三倍以上。
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