Electrochemical Technology Centre, Department of Chemistry, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada.
Zentek Ltd., 24 Corporate Court, Guelph, ON N1G 5G5, Canada.
Molecules. 2022 Dec 7;27(24):8643. doi: 10.3390/molecules27248643.
Here, we report on a new automated electrochemical process for the production of graphene oxide (GO) from graphite though electrochemical exfoliation. The effects of the electrolyte and applied voltage were investigated and optimized. The morphology, structure and composition of the electrochemically exfoliated GO (EGO) were probed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), FTIR spectroscopy and Raman spectroscopy. Important metrics such as the oxygen content (25.3 at.%), defect density (I/I = 0.85) and number of layers of the formed EGO were determined. The EGO was also compared with the GO prepared using the traditional chemical method, demonstrating the effectiveness of the automated electrochemical process. The electrochemical properties of the EGO, CGO and other carbon-based materials were further investigated and compared. The automated electrochemical exfoliation of natural graphite powder demonstrated in the present study does not require any binders; it is facile, cost-effective and easy to scale up for a large-scale production of graphene-based nanomaterials for various applications.
在这里，我们报告了一种新的自动化电化学方法，通过电化学剥离从石墨中生产氧化石墨烯（GO）。研究并优化了电解液和外加电压的影响。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射（XRD）、能谱（EDX）、X 射线光电子能谱（XPS）、傅里叶变换红外光谱（FTIR）和拉曼光谱对电化学剥离氧化石墨烯（EGO）的形貌、结构和组成进行了研究。确定了形成的 EGO 的重要指标，如氧含量（25.3 原子%）、缺陷密度（I/I = 0.85）和层数。还将 EGO 与传统化学方法制备的 GO 进行了比较，证明了自动化电化学工艺的有效性。进一步研究和比较了 EGO、CGO 和其他碳基材料的电化学性能。本研究中展示的天然石墨粉末的自动化电化学剥离不需要任何粘合剂；它简便、经济高效，易于扩大规模，可用于各种应用的基于石墨烯的纳米材料的大规模生产。
