Saleem Faisal, Zhang Zhicheng, Cui Xiaoya, Gong Yue, Chen Bo, Lai Zhuangchai, Yun Qinbai, Gu Lin, Zhang Hua
Center for Programmable Materials, School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639798 , Singapore.
Beijing National Laboratory for Condensed Matter Physics , Institute of Physics, Chinese Academy of Sciences , Beijing 100190 China.
J Am Chem Soc. 2019 Sep 18;141(37):14496-14500. doi: 10.1021/jacs.9b05197. Epub 2019 Sep 4.
In this work, we report an element segregation phenomenon in two-dimensional (2D) core-shell nanoplates, subsequently resulting in the formation of yolk-cage nanostructures after selective electrochemical etching. By using PtCu nanoplates as templates, PtCu@Pd core-shell nanoplates are formed. Interestingly, during the growth of Ru on the PtCu@Pd core-shell nanoplates, due to the selective element diffusion, PtCuPd@PdCu@Ru nanoplates are obtained. After selectively etching of PdCu in PtCuPd@PdCu@Ru using electrochemical method, the PtCuPd@Ru yolk-cage nanostructures are obtained. As a proof-of-concept application, this unique nanostructure shows superior electrocatalytic activity and stability toward the methanol oxidation reaction as compared to the PtCu nanoplates and commercial Pt/C catalyst.
在这项工作中，我们报道了二维（2D）核壳纳米板中的元素偏析现象，随后通过选择性电化学蚀刻形成了蛋黄笼状纳米结构。以PtCu纳米板为模板，形成了PtCu@Pd核壳纳米板。有趣的是，在PtCu@Pd核壳纳米板上生长Ru的过程中，由于选择性元素扩散，得到了PtCuPd@PdCu@Ru纳米板。使用电化学方法在PtCuPd@PdCu@Ru中选择性蚀刻PdCu后，得到了PtCuPd@Ru蛋黄笼状纳米结构。作为概念验证应用，与PtCu纳米板和商业Pt/C催化剂相比，这种独特的纳米结构对甲醇氧化反应表现出优异的电催化活性和稳定性。
