Energy Science and Technology Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China.
J Colloid Interface Sci. 2010 Apr 1;344(1):132-6. doi: 10.1016/j.jcis.2009.12.019. Epub 2009 Dec 16.
Carbon-supported bimetallic Au-Pt nanoparticle catalysts with a core-shell structure were prepared by the successive reduction method. UV-vis spectra, TEM, XPS, and XRD techniques were used to characterize the prepared core-shell and the monometallic catalysts. Results of all the physical characterizations showed the continuous growth of the Pt shell on the Au core. The electrocatalytic activities for oxygen reduction were characterized using the rotating disk electrode technique in an acid electrolyte, and were compared with those obtained on a Pt/C catalyst under the same measurement conditions. It was found that these core-shell nanoparticles exhibited the structural characteristics of mainly fcc Au nanocrystals but the electrochemical properties of a Pt surface. The electrocatalytic activities of these core-shell nanoparticles showed a transition from the low activity of Au to the high activity of Pt, and the catalyst with a Au-Pt atomic ratio of 2:1 had a maximized specific mass activity, proving the enhanced Pt utilization with the core-shell structure.
采用连续还原法制备了具有核壳结构的碳负载双金属 Au-Pt 纳米粒子催化剂。采用紫外-可见光谱、TEM、XPS 和 XRD 技术对制备的核壳和单金属催化剂进行了表征。所有物理特性的结果表明，Pt 壳在 Au 核上连续生长。在酸性电解质中使用旋转圆盘电极技术对氧还原的电催化活性进行了表征，并在相同的测量条件下与 Pt/C 催化剂进行了比较。结果表明，这些核壳纳米粒子表现出主要为 fccAu 纳米晶的结构特征，但具有 Pt 表面的电化学性质。这些核壳纳米粒子的电催化活性表现出从低活性 Au 到高活性 Pt 的转变，并且 Au-Pt 原子比为 2:1 的催化剂具有最大的比质量活性，证明了核壳结构提高了 Pt 的利用率。
