Maphiri Vusani M, Bakhoum Daba T, Sarr Samba, Sylla Ndeye F, Rutavi Gift, Manyala Ncholu
Department of Physics, Institute of Applied Materials, SARChI Chair in Carbon Technology and Materials, University of Pretoria, Pretoria 0028, South Africa.
Nanomaterials (Basel). 2022 Jun 28;12(13):2211. doi: 10.3390/nano12132211.
In this work, a thermally reduced graphene oxide (TRGO) thin film on microscopic glass was prepared using spray coating and atmospheric pressure chemical vapour deposition. The structure of TRGO was analysed using X-ray diffraction (XRD) spectroscopy, scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy, and ultraviolet-visible spectroscopy (UV-Vis) suggesting a decrease in oxygen functional groups (OFGs), leading to the restacking, change in colour, and transparency of the graphene sheets. Raman spectrum deconvolution detailed the film's parameters, such as the crystallite size, degree of defect, degree of amorphousness, and type of defect. The electrochemical performance of the microsupercapacitor (µ-SC) showed a rectangular cyclic voltammetry shape, which was maintained at a high scan rate, revealing phenomenal electric double-layer capacitor (EDLC) behaviour. The power law and Trasatti's analysis indicated that low-temperature TRGO µ-SC is dominated by diffusion-controlled behaviour, while higher temperature TRGO µ-SC is dominated by surface-controlled behaviour.
在这项工作中，采用喷涂和常压化学气相沉积法在微观玻璃上制备了热还原氧化石墨烯（TRGO）薄膜。使用X射线衍射（XRD）光谱、扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）、傅里叶变换红外（FTIR）光谱和紫外可见光谱（UV-Vis）对TRGO的结构进行了分析，结果表明氧官能团（OFGs）减少，导致石墨烯片层发生重新堆叠、颜色变化和透明度改变。拉曼光谱去卷积详细说明了薄膜的参数，如微晶尺寸、缺陷程度、非晶化程度和缺陷类型。微型超级电容器（µ-SC）的电化学性能呈现出矩形循环伏安形状，在高扫描速率下保持不变，显示出显著的双电层电容器（EDLC）行为。幂律和特拉萨蒂分析表明，低温TRGO µ-SC以扩散控制行为为主，而高温TRGO µ-SC以表面控制行为为主。
