催化作用
高分辨率透射电子显微镜
X射线光电子能谱
傅里叶变换红外光谱
甲醇
纳米颗粒
材料科学
乙二醇
酒精氧化
核化学
拉曼光谱
化学
分析化学(期刊)
无机化学
化学工程
透射电子显微镜
纳米技术
有机化学
光学
物理
工程类
作者
Cyril Tlou Selepe,Sandile Surprise Gwebu,Thabo Matthews,Tebogo Abigail Mashola,Ludwe L. Sikeyi,Memory Zikhali,Nobanathi Wendy Maxakato
出处
期刊:Nanomaterials
[MDPI AG]
日期:2021-10-15
卷期号:11 (10): 2725-2725
被引量:6
摘要
Carbon nano-onions (CNOs) were successfully synthesized by employing the flame pyrolysis (FP) method, using flaxseed oil as a carbon source. The alcohol reduction method was used to prepare Pd/CNOs and Pd-Sn/CNOs electro-catalysts, with ethylene glycol as the solvent and reduction agent. The metal-nanoparticles were supported on the CNO surface without adjusting the pH of the solution. High-resolution transmission electron microscopy (HRTEM) images reveal CNOs with concentric graphite ring morphology, and also PdSn nanoparticles supported on the CNOs. X-ray diffractometry (XRD) patterns confirm that CNOs are amorphous and show the characteristic diffraction peaks of Pd. There is a shifting of Pd diffraction peaks to lower angles upon the addition of Sn compared to Pd/CNOs. X-ray photoelectron spectroscopy (XPS) results also confirm the doping of Pd with Sn to form a PdSn alloy. Fourier transform infrared spectroscopy (FTIR) displays oxygen, hydroxyl, carboxyl, and carbonyl, which facilitates the dispersion of Pd and Sn nanoparticles. Raman spectrum displays two prominent peaks of carbonaceous materials which correspond to the D and G bands. The Pd-Sn/CNOs electro-catalyst demonstrates improved electro-oxidation of methanol and ethanol performance compared to Pd/CNOs and commercial Pd/C electro-catalysts under alkaline conditions.
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