Monodispersed sub-5.0 nm PtCu nanoalloys as enhanced bifunctional electrocatalysts for oxygen reduction reaction and ethanol oxidation reaction
Monodispersed sub-5.0 nm PtCu nanoalloys as enhanced bifunctional electrocatalysts for oxygen reduction reaction and ethanol oxidation reaction
复制标题
单分散亚5.0 nm PtCu纳米合金作为增强型双功能电催化剂用于氧还原反应和乙醇氧化反应
作者：
Taiyang Liu;Kai Wang;Qiang Yuan;Zebin Shen;Ye Wang;Qinghong Zhang;Xun Wang
为燃料电池的阳极和阴极反应开发具有更高活性和稳定性的高效电催化剂仍然是一个挑战。在这里，我们报道了一锅法制备单分散、均匀的亚5.0 nm PtCu合金多面体，其尺寸分布较窄。在碱性条件下，这些PtCu合金多面体在阴极和阳极反应中表现出比商业铂/碳催化剂更高的电催化活性。Pt68Cu32纳米合金的氧还原反应比活性和质量活性分别是铂/碳催化剂的15倍和2.8倍。Pt68Cu32纳米合金在乙醇氧化反应中的峰电流密度和质量活性分别是铂/碳催化剂的11.8倍和2.12倍。此外，合成的Pt68Cu32纳米合金在ORR和EOR方面都比商品铂碳黑具有更高的稳定性。这些实验结果表明，开发单分散、亚5.0 nm的PtCu纳米合金作为燃料电池阴极和阳极反应的双功能电催化剂是一种有效的方法。
The development of effective electrocatalysts with enhanced activity and stability for both the anode and the cathode reaction in fuel cells still remains a challenge. Here, we report a one-pot route to prepare monodispersed, uniform sub-5.0 nm PtCu alloy polyhedra with a narrow size distribution. These PtCu alloy polyhedra exhibit enhanced electrocatalytic activity for both cathode and anode reactions as compared to the commercial Pt/C catalyst under alkaline conditions. The specific activity and mass activity on Pt68Cu32 nanoalloys are 15 and 2.8 times that on Pt/C catalyst toward oxygen reduction reaction (ORR), respectively. And the peak current density and mass activity on Pt68Cu32 nanoalloys are 11.8 and 2.12 times that on Pt/C catalyst toward ethanol oxidation reaction (EOR), respectively. Furthermore, the as-synthesized Pt68Cu32 nanoalloys have much higher stability than commercial Pt/C black for both ORR and EOR. These experimental results show an effective approach to the development of monodispersed, sub-5.0 nm PtCu nanoalloys as bifunctional electrocatalysts for both the cathode and the anode reaction in fuel cells.