Choi Wooyong, Kim Jong Min, Hwang Chang-Kyu, Choe Myeonggi, Baek Seongheon, Ban Hyeong Woo, Gu Da Hwi, Jeong Hyewon, Chae Keun Hwa, Lim Youngjoon, Lee Zonghoon, Kim Jin Young, Son Jae Sung
School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea.
Nanoscale. 2020 May 21;12(19):10498-10504. doi: 10.1039/c9nr10706a. Epub 2020 May 11.
Herein, we report for the first time the successful preparation of thiometallate-based precursors for use in a bottom-up synthetic process of supported Pt and PtNi nanoparticle catalyst. This precursor enabled the monodisperse synthesis of supported Pt nanoparticles and the in situ formation of S, which were caught directly in a collection system by the nanoparticle synthetic processes consisting of impregnation and thermal processes. S is proven to act as a capping agent in generating highly stable nanoparticles with the size ranging from 2 nm to 3 nm and further favors the formation of monodispersed particles by solid-state digestive ripening. The proposed synthetic methodology can be applied to high-quality PtNi alloy nanoparticle systems. The current route is readily scalable, and multi-gram quantities can be prepared. The prepared carbon-supported Pt and PtNi nanoparticles were characterized as electrocatalysts for the oxygen reduction reaction and exhibited superior performance and durability to commercial Pt/C.
在此，我们首次报道成功制备了用于负载型Pt和PtNi纳米颗粒催化剂自下而上合成过程的硫属金属酸盐基前驱体。这种前驱体能够实现负载型Pt纳米颗粒的单分散合成以及S的原位形成，S通过由浸渍和热过程组成的纳米颗粒合成过程直接捕获在收集系统中。事实证明，S在生成尺寸范围为2纳米至3纳米的高度稳定纳米颗粒时充当封端剂，并通过固态消化熟化进一步有利于形成单分散颗粒。所提出的合成方法可应用于高质量的PtNi合金纳米颗粒系统。当前路线易于扩展规模，可制备多克量的产物。所制备的碳负载型Pt和PtNi纳米颗粒被表征为氧还原反应的电催化剂，并且表现出优于商业Pt/C的性能和耐久性。
