College of Chemistry and Materials Science, Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, 241000, P. R. China.
Nanoscale. 2012 Sep 21;4(18):5738-43. doi: 10.1039/c2nr31765f. Epub 2012 Aug 14.
Pt-based nanocomposites have been of great research interest. In this paper, we design an efficient MO/rGO/Pt sandwich nanostructure as an anodic electrocatalyst for DMFCs with combination of the merits of rigid structure of metallic oxides (MOs) and excellent electronic conductivity of reduced oxidized graphene (rGO) as well as overcoming their shortcomings. In this case, the CeO(2)/rGO/Pt sandwich nanostructure is successfully fabricated through a facile hydrothermal approach in the presence of graphene oxide and CeO(2) nanoparticles. This structure has a unique building architecture where rGO wraps up the CeO(2) nanoparticles and Pt nanoparticles are homogeneously dispersed on the surface of rGO. This novel structure endows this material with great electrocatalytic performance in methanol oxidation: it reduces the overpotential of methanol oxidation significantly and its electrocatalytic activity and stability are much enhanced compared with Pt/rGO, CeO(2)/Pt and Pt/C catalysts. This work supplies a unique MO/rGO/Pt sandwich nanostructure as an efficient way to improve the electrocatalytic performance, which will surely shed some light on the exploration of some novel structures of electrocatalyst for DMFCs.
基于铂的纳米复合材料一直是研究的热点。在本文中，我们设计了一种高效的 MO/rGO/Pt 夹层纳米结构，作为直接甲醇燃料电池的阳极电催化剂，结合了金属氧化物 (MOs) 的刚性结构和还原氧化石墨烯 (rGO) 的优异导电性，并克服了它们的缺点。在这种情况下，CeO(2)/rGO/Pt 夹层纳米结构是通过在氧化石墨烯和 CeO(2)纳米粒子存在下的简便水热方法成功制备的。这种结构具有独特的建筑结构，其中 rGO 包裹 CeO(2)纳米粒子，Pt 纳米粒子均匀分散在 rGO 表面。这种新型结构赋予了这种材料在甲醇氧化中的优异电催化性能：它显著降低了甲醇氧化的过电势，与 Pt/rGO、CeO(2)/Pt 和 Pt/C 催化剂相比，其电催化活性和稳定性得到了极大的提高。这项工作提供了一种独特的 MO/rGO/Pt 夹层纳米结构，作为提高电催化性能的有效方法，这必将为直接甲醇燃料电池的电催化剂新型结构的探索提供一些启示。
