Fujigaya Tsuyohiko, Kim ChaeRin, Hamasaki Yuki, Nakashima Naotoshi
International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan.
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan.
Sci Rep. 2016 Feb 22;6:21314. doi: 10.1038/srep21314.
The development of a non-Pt electrocatalyst with a high performance for the oxygen reduction reaction (ORR) is one of the central issues in polymer electrolyte fuel cells science. Au-nanoparticles (Au-NPs) with a diameter of <2 nm are one of the promising substitutes of Pt-NPs; however, it is still a challenge to synthesize such a small-sized Au-NPs with a narrow diameter distribution on a carbon support without using capping agents. We here describe a facile method to deposit uniform Au-NPs (diameter = 1.6 nm and 3.3 nm) on the stacked-graphene (<10 layers) coated with poly[2,2'-(2,6-pyridine)-5,5'-bibenzimidazole] without using any capping agents. The obtained Au-NPs exhibit an excellent ORR activity with the onset potential at -0.11 V and -0.09 V (vs. Ag/AgCl) for 1.6 nm and 3.3 nm, respectively. On the other hand, inhomogeneous Au-NPs with 4.6 nm in average diameter shows the onset potential at -0.15 V (vs. Ag/AgCl).
开发一种对氧还原反应（ORR）具有高性能的非铂电催化剂是聚合物电解质燃料电池科学的核心问题之一。直径小于2纳米的金纳米颗粒（Au-NPs）是铂纳米颗粒（Pt-NPs）有前景的替代物之一；然而，在不使用封端剂的情况下，在碳载体上合成如此小尺寸且直径分布窄的金纳米颗粒仍是一项挑战。我们在此描述了一种简便方法，可在涂有聚[2,2'-(2,6-吡啶)-5,5'-联苯并咪唑]的堆叠石墨烯（<10层）上沉积均匀的金纳米颗粒（直径分别为1.6纳米和3.3纳米），且不使用任何封端剂。所获得的金纳米颗粒表现出优异的氧还原反应活性，对于直径为1.6纳米和3.3纳米的颗粒，起始电位分别为-0.11伏和-0.09伏（相对于Ag/AgCl）。另一方面，平均直径为4.6纳米的不均匀金纳米颗粒的起始电位为-0.15伏（相对于Ag/AgCl）。
