Komanicky Vladimir, Iddir Hakim, Chang Kee-Chul, Menzel Andreas, Karapetrov Goran, Hennessy Daniel, Zapol Peter, You Hoydoo
Safarik University, Faculty of Sciences and, Institute of Experimental Physics, SAS, Kosice 04154, Slovakia.
J Am Chem Soc. 2009 Apr 29;131(16):5732-3. doi: 10.1021/ja900459w.
We produced millions of morphologically identical platinum catalyst nanoparticles in the form of ordered arrays epitaxially grown on (111), (100), and (110) strontium titanate substrates using electron beam lithography. The ability to design, produce, and characterize the catalyst nanoparticles allowed us to relate microscopic morphologies with macroscopic catalytic reactivities. We evaluated the activity of three different arrays containing different ratios of (111) and (100) facets for an oxygen-reduction reaction, the most important reaction for fuel cells. Increased catalytic activity of the arrays points to a possible cooperative interplay between facets with different affinities to oxygen. We suggest that the surface area of (100) facets is one of the key factors governing catalyst performance in the electrochemical reduction of oxygen molecules.
我们利用电子束光刻技术，在（111）、（100）和（110）钛酸锶衬底上外延生长出数百万个形态相同的铂催化剂纳米颗粒，这些纳米颗粒呈有序阵列形式。设计、制备和表征催化剂纳米颗粒的能力使我们能够将微观形态与宏观催化活性联系起来。我们评估了三种不同阵列（包含不同比例的（111）和（100）晶面）对氧还原反应（燃料电池中最重要的反应）的活性。阵列催化活性的提高表明，对氧具有不同亲和力的晶面之间可能存在协同相互作用。我们认为，（100）晶面的表面积是决定氧分子电化学还原中催化剂性能的关键因素之一。
