拉曼光谱
碳纳米管
高分辨率透射电子显微镜
X射线光电子能谱
材料科学
惰性气体
化学气相沉积
循环伏安法
线性扫描伏安法
化学工程
傅里叶变换红外光谱
热解
纳米技术
核化学
电极
电化学
透射电子显微镜
化学
复合材料
物理
工程类
物理化学
光学
作者
Juan Briceño,Danielle de Oliveira Rosas,Igor Lemus,Romeli Barbosa,Beatriz Escobar
标识
DOI:10.1016/j.jaap.2023.106082
摘要
The conventional synthesis of multi-walled carbon nanotubes (MWCNT) presents an environmental challenge due to toxic precursors. This research proposes a green synthesis of MWCNT by chemical vapor deposition (CVD) using a natural carbon source precursor (olive oil). Nitrogen gas was used as an inert atmosphere and a carrier for the evaporator precursor (200 °C). MWCNTs were synthesized at 900 °C using NiCl2 as a catalyst. MWCNTs had two treatments: functionalized and purified with HNO3 and HCl. Different physicochemical techniques characterized the MWCNT, such as X-ray diffraction (XRD), FTIR, high-resolution transmission electron microscopy (HRTEM), XPS, Raman spectroscopy, and CHN-S. The size of the MWCNT grew to be between de 15 a 25 nm with a purity of 20%, while the Raman spectroscopy revealed structural changes in the MWCNT after the purification treatment due to variations in the ID/IG index. All the synthesized MWCNTs were electrochemically characterized with linear sweep and cyclical voltammetry to analyze their electrocatalytic response to oxygen reduction reaction (ORR) in alkaline media.
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