College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
J Colloid Interface Sci. 2018 Jul 1;521:111-118. doi: 10.1016/j.jcis.2018.03.035. Epub 2018 Mar 13.
Bimetallic nanocatalysts with small particle size benefit from markedly enhanced electrocatalytic activity and stability during small molecule oxidation. Herein, we report a facile method to synthesize binary Pt-Ru nanoparticles dispersed on a carbon support at an optimum temperature. Because of its monodispersed nanostructure, synergistic effects were observed between Pt and Ru and the PtRu/C electrocatalysts showed remarkably enhanced electrocatalytic activity towards ethanol oxidation. The peak current density of the PtRu/C electrocatalyst is 3731 mA mg, which is 9.3 times higher than that of commercial Pt/C (401 mA mg). Furthermore, the synthesized PtRu/C catalyst exhibited higher stability during ethanol oxidation in an alkaline medium and maintained a significantly higher current density after successive cyclic voltammograms (CVs) of 500 cycles than commercial Pt/C. Our work highlights the significance of the reaction temperature during electrocatalyst synthesis, leading to enhanced catalytic performance towards ethanol oxidation. The PtRu/C electrocatalyst has great potential for application in direct ethanol fuel cells.
双金属纳米催化剂具有较小的颗粒尺寸，有利于在小分子氧化过程中显著提高电催化活性和稳定性。在此，我们报告了一种在最佳温度下将二元 Pt-Ru 纳米颗粒分散在碳载体上的简便方法。由于其单分散的纳米结构，Pt 和 Ru 之间存在协同效应，PtRu/C 电催化剂对乙醇氧化表现出显著增强的电催化活性。PtRu/C 电催化剂的峰值电流密度为 3731 mA mg，是商业 Pt/C（401 mA mg）的 9.3 倍。此外，在碱性介质中进行乙醇氧化时，所合成的 PtRu/C 催化剂表现出更高的稳定性，并且在经过 500 个连续循环伏安法（CV）后，其电流密度比商业 Pt/C 显著更高。我们的工作强调了电催化剂合成过程中反应温度的重要性，这导致了对乙醇氧化的催化性能的提高。PtRu/C 电催化剂在直接乙醇燃料电池中有很大的应用潜力。
