School of Food Science and Engineering, South China University of Technology , Guangzhou 510640, People's Republic of China.
Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University , Shenzhen 518060, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Feb 1;9(4):3535-3543. doi: 10.1021/acsami.6b09573. Epub 2017 Jan 19.
One-dimensional (1D) anisotropic platinum-based nanowires are promising electrocatalysts in polymer electrolyte membrane fuel cells owing to the inherent structural merits. Herein, we report an in situ growth of ultrathin PtRh nanowires (diameters of 2-3 nm) on graphene nanosheets via the oriented attachment pathway. Mechanistic studies reveal that graphene nanosheets play a critical role in the nucleation and growth of PtRh nanowires. The resulting hybrid of PtRh nanowire decorated graphene nanosheets shows outstanding activity and durability toward ethanol electro-oxidation. It exhibits a specific current density of 2.8 mA cm and a mass-normalized current density of 1 A mg metal, which are 5.4 and 3.1 times those of the state-of-the-art Pt/C catalyst, respectively. After 2000 cyclic tests, it maintains 86% of the initial electrochemically active surface area, which is larger than that of 63% obtained from the Pt/C catalyst. The superior performance is attributed to the combination of the advantageous 1D morphological motif with the synergistic effects of PtRh alloys and graphene nanosheet support.
一维（1D）各向异性铂基纳米线由于其固有结构优势，是聚合物电解质膜燃料电池中很有前途的电催化剂。在此，我们通过定向附着途径报道了在石墨烯纳米片上原位生长超薄 PtRh 纳米线（直径为 2-3nm）。机理研究表明，石墨烯纳米片在 PtRh 纳米线的成核和生长中起着关键作用。所得 PtRh 纳米线修饰的石墨烯纳米片杂化物在乙醇电氧化中表现出优异的活性和耐久性。它的比电流密度为 2.8mAcm，质量归一化电流密度为 1Amg金属，分别是最先进的 Pt/C 催化剂的 5.4 倍和 3.1 倍。经过 2000 次循环测试后，它保持了初始电化学活性表面积的 86%，大于 Pt/C 催化剂的 63%。优异的性能归因于有利的 1D 形态特征与 PtRh 合金和石墨烯纳米片载体的协同效应的结合。
