Abstract

An easy and efficient method was considered to enhance the activity of Pt/C catalyst for ethanol oxidation by formation of a platinum-cobalt alloy via electrodeposition technique. The morphology and structural properties of the prepared Pt-Co/C alloy catalyst were determined by SEM, EDX and XRD. The XRD curves confirmed Pt characteristic peaks at around 2θ = 39.76° (111) and 46.23° (200) while the existence of Co was not clear at 2θ = 44.5° and 51.85° owing to its alloying with Pt. CV, CA, EIS techniques were employed to examine the electrochemical behavior of the Pt-Co/C catalyst. The impedance data were fitted to the Randles circuit to obtain the parameters for a single faradic reaction coupled with mass transfer. The Pt-Co/C catalyst showed better performance in terms of the onset potential and current density. The sample containing Pt-Co/C catalyst exhibited about 2 times more current density than the commercial Pt/C catalyst.

摘要

一种简单有效的方法被认为是通过电沉积技术形成铂钴合金来提高 Pt/C 催化剂对乙醇氧化的活性。通过SEM、EDX和XRD对制备的Pt-Co/C合金催化剂的形貌和结构性能进行了测定。XRD 曲线证实 Pt 特征峰位于 2θ = 39.76° (111) 和 46.23° (200) 附近，而 Co 在 2θ = 44.5° 和 51.85° 处的存在不清楚，因为它与 Pt 合金化。采用 CV、CA、EIS 技术来检查 Pt-Co/C 催化剂的电化学行为。阻抗数据被拟合到兰德尔电路以获得与传质耦合的单个法拉第反应的参数。Pt-Co/C 催化剂在起始电位和电流密度方面表现出更好的性能。