Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.
J Am Chem Soc. 2012 Feb 8;134(5):2492-5. doi: 10.1021/ja2104334. Epub 2012 Jan 26.
Seven-nanometer FePt nanoparticles (NPs) were synthesized and assembled on graphene (G) by a solution-phase self-assembly method. These G/FePt NPs were a more active and durable catalyst for oxygen reduction reaction (ORR) in 0.1 M HClO(4) than the same NPs or commercial Pt NPs deposited on conventional carbon support. The G/FePt NPs annealed at 100 °C for 1 h under Ar + 5% H(2) exhibited specific ORR activities of 1.6 mA/cm(2) at 0.512 V and 0.616 mA/cm(2) at 0.557 V (vs Ag/AgCl). As a comparison, the commercial Pt NPs (2-3 nm) had specific activities of 0.271 and 0.07 mA/cm(2) at the same potentials. The G/FePt NPs were also much more stable in the ORR condition and showed nearly no activity change after 10 000 potential sweeps. The work demonstrates that G is indeed a promising support to improve NP activity and durability for practical catalytic applications.
采用溶液自组装法将七纳米 FePt 纳米颗粒（NPs）组装在石墨烯（G）上。在 0.1 M HClO4 中，这些负载在 G 上的 FePt NPs 作为氧还原反应（ORR）的催化剂比相同的 NPs 或负载在传统碳载体上的商业 Pt NPs 具有更高的活性和更好的耐久性。在 Ar + 5% H2 中于 100°C 下退火 1 h 的 G/FePt NPs 在 0.512 V 时的比 ORR 活性为 1.6 mA/cm2，在 0.557 V 时的比活性为 0.616 mA/cm2（相对于 Ag/AgCl）。相比之下，商业 Pt NPs（2-3 nm）在相同的电位下具有 0.271 和 0.07 mA/cm2 的比活性。在 ORR 条件下，G/FePt NPs 也更加稳定，经过 10000 次电位扫描后几乎没有活性变化。这项工作表明，G 确实是一种很有前途的载体，可以提高 NP 的活性和耐久性，从而应用于实际的催化领域。
