Yang Sudong, Shen Chengmin, Tian Yuan, Zhang Xiaogang, Gao Hong-Jun
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China. hjgao@ iphy.ac.cn
Nanoscale. 2014 Nov 7;6(21):13154-62. doi: 10.1039/c4nr04349a.
Single-crystal palladium nanoparticles (NPs) with controllable morphology were synthesized on the surface of reduced graphene oxide (RGO) by a novel procedure, namely reducing palladium acetylacetonate [Pd(acac)2] with the N-methylpyrrolidone (NMP) solvent in the presence of poly(vinylpyrrolidone) (PVP). The resulting Pd nanocrystals (8 nm in diameter) were uniformly distributed on the RGO. A possible formation mechanism is discussed. The electrocatalytic performance of Pd nanocrystal/RGO catalysts during formic acid oxidation was investigated, which revealed that the cubic Pd/RGO catalyst performed significantly better than the spherical Pd/RGO catalyst. The shape of Pd nanocrystals on the surface of graphene nanosheets can be easily controlled via tuning the synthesis parameters, resulting in tunable catalytic properties. Moreover, this method can be easily extended to fabricate other noble metal nanostructures.
通过一种新颖的方法，即在聚乙烯吡咯烷酮（PVP）存在下，用N - 甲基吡咯烷酮（NMP）溶剂还原乙酰丙酮钯[Pd(acac)₂]，在还原氧化石墨烯（RGO）表面合成了具有可控形貌的单晶钯纳米颗粒（NPs）。所得的钯纳米晶体（直径8 nm）均匀分布在RGO上。讨论了一种可能的形成机制。研究了钯纳米晶体/RGO催化剂在甲酸氧化过程中的电催化性能，结果表明立方体形的Pd/RGO催化剂的性能明显优于球形的Pd/RGO催化剂。通过调节合成参数，可以轻松控制石墨烯纳米片表面钯纳米晶体的形状，从而实现催化性能的调控。此外，该方法可以很容易地扩展用于制备其他贵金属纳米结构。
