Abstract

Carbon-supported Pt/C, Pt/Re/C, Pt/SnO₂/C and Pt/Re/SnO₂/C, with 20 wt.% overall metal loading were prepared and their electrochemical activity towards ethanol oxidation reaction (EOR) was investigated. Transmission electron microscopy (TEM) combined with energy dispersive X-ray spectroscopy (EDS) revealed, that indeed binary and ternary combinations of the designed nanoparticles (NPs) were formed and successfully uniformly deposited on a carbon support. Fourier transform infrared spectroscopy (FTIR) allowed to assess the chemical composition of the nanocatalysts and X-ray diffraction (XRD) allowed to determine the catalyst structure. Potentiodynamic and chronoamperometric measurements were used to establish its catalytic activity and stability. The influence of Re addition on the electrochemical activity towards ethanol oxidation reaction (EOR) was verified. Indeed, the addition of Re to the binary Pt/SnO2/C catalyst leads to the formation of ternary Pt/Re/SnO₂/C with physical contact between the individual NPs, enhancing the EOR. Furthermore, the onset potential of the synthesized ternary catalyst is shifted to more negative potentials and the current densities and specific activity are nearly 11 and 5 times higher, respectively, than for commercial Pt catalyst. Additionally ternary Pt/Re/SnO2/C catalyst retained 96% of its electrochemical surface area.

中文翻译：

---

用于EOR的三元Pt / Re / SnO 2 / C催化剂：电催化活性和耐久性的提高

摘要

碳载Pt / C，Pt / Re / C，Pt / SnO ₂ / C和Pt / Re / SnO ₂/ C，制备了具有20 wt。％的总金属负载量，并研究了它们对乙醇氧化反应（EOR）的电化学活性。透射电子显微镜（TEM）结合能量色散X射线光谱（EDS）揭示，确实形成了设计的纳米颗粒（NPs）的二元和三元组合，并成功地均匀地沉积在碳载体上。傅里叶变换红外光谱（FTIR）可以评估纳米催化剂的化学组成，X射线衍射（XRD）可以确定催化剂的结构。电位动力学和计时电流法测量用于建立其催化活性和稳定性。验证了Re添加对乙醇氧化反应（EOR）电化学活性的影响。确实，₂ / C，各个NP之间具有物理接触，从而提高了EOR。此外，合成三元催化剂的起始电势被转移到更多的负电势，并且电流密度和比活性分别比市售Pt催化剂高近11倍和5倍。另外，三元Pt / Re / SnO2 / C催化剂保留了其电化学表面积的96％。