We report simple and cost effective production of water soluble graphene sheets using coal. The synthesized coal derived graphene (CDG) sheets were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HR-TEM), field emission scanning electron microscopy (FE-SEM), Raman, Fourier transform infrared (FTIR), ultra-violet visible (UV-vis) spectroscopy, and photoluminescence (PL) measurements. The presence of edge oxygen functionalities in CDG sheets causes to induce florescent properties. The nature of PL emission peak does not change by varying the excitation wavelength. In order to determine its energy storage properties, cyclic voltammetry (CV), charge-discharge and electrochemical impedance spectroscopy (EIS) measurements were done in different electrolytes. The value of specific capacitance (SC) of CDG in 1M Na₂SO₄ electrolyte turns to be 277 F/g at scan rate of 5 mV/s. CDG show long cycle stability i.e., the value of SC still remains at ∼ 91 % after 2000 cycles at current density of 10 mA/g.

我们报道了使用煤简单且经济高效地生产水溶性石墨烯片的方法。利用X射线衍射（XRD），高分辨率透射电子显微镜（HR-TEM），场发射扫描电子显微镜（FE-SEM），拉曼光谱，傅立叶变换红外光谱（FTIR）对合成的煤衍生石墨烯（CDG）片材进行了表征。 ），紫外可见（UV-vis）光谱和光致发光（PL）测量。CDG片材中边缘氧官能团的存在导致诱导荧光性质。PL发射峰的性质不会通过改变激发波长而改变。为了确定其能量存储特性，在不同的电解质中进行了循环伏安法（CV），充放电和电化学阻抗谱（EIS）测量。₂ SO ₄电解质在5 mV / s的扫描速率下变为277 F / g。CDG显示出长周期稳定性，即在电流密度为10 mA / g的情况下，经过2000次循环后，SC值仍保持在〜91％。