Synthesis of Fluorinated Graphene/CoAl-Layered Double Hydroxide Composites as Electrode Materials for Supercapacitors
Synthesis of Fluorinated Graphene/CoAl-Layered Double Hydroxide Composites as Electrode Materials for Supercapacitors
复制标题
氟化石墨烯/CoAl层状双氢氧化物复合材料超级电容器电极材料的合成
DOI：
10.1021/acsami.6b11316
复制
发表时间：
2017-02-15
影响因子：
9.5
通讯作者：
Song, Shaoxian
中科院分区：
文献类型：
--
作者：
Peng, Weijun;Li, Hongqiang;Song, Shaoxian
采用两步水热法制备了CoAl-LDH/FGN复合材料。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、场发射扫描电子显微镜（FESEM）、能谱（EDS）和电化学测试等手段对合成的CoAl-LDH/FGN复合材料进行了表征。结果表明，不同构型的含氟碳原子被接枝到石墨烯的骨架上，且碳氟键的构型和含氟量可以通过接枝时间进行调节。大部分半离子CF键在适当的活化时间形成，然后转化为富氟表面基团（如CF 2、CF 3等）。其随着老化时间的延长而电化学惰性。此外，在最佳焙烧时间下制备的CoAl-LDH/FGN复合材料具有最高的比电容（1A/g时为1222 F/g）、最好的倍率性能和最稳定的电容保持率，有望作为超级电容器的电极材料。
CoAl-layered double hydroxide/fluorinated graphene (CoAl-LDH/FGN) composites were fabricated via a two-step hydrothermal method. The synthesized CoAl-LDH/FGN composites have been characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), and electrochemical measurements. The results indicated that the fluorinated carbon with various configuration forms were grafted onto the framework of graphene, and the CF bond configuration and fluorine content could be tuned by the fluorination time. Most of semi-ionic CF bonds were formed at an appropriate fluorination time and, then, converted into fluorine rich surface groups (such as CF2, CF3, etc.) which were electrochemically inactive as the fluorination time prolonged. Moreover, the CoAl-LDH/FGN composites prepared at the optimal fluorination time exhibited the highest specific capacitance (1222 F/g at 1 A/g), the best rate capability, and the most stable capacitance retention, which offered great promise as electrode materials for supercapacitors.