还原氧化石墨烯/Al-Ni层状双氢氧化物复合物的制备及其电化学电容行为

Preparation and electrochemical capacitive behaviors of reduced graphene oxide/Al-Ni layered Ddoubled-hydroxide composite

以硝酸镍和硝酸铝为原料,尿素作为还原剂和沉淀剂,通过水热法一步合成了不同配比的还原氧化石墨烯/Al-Ni层状双氢氧化物复合物(rGO/LDH)。用X射线衍射(XRD),红外光谱(FT-IR),拉曼光谱(Raman)和场发射扫描电镜(FESEM)对其结构和形貌进行物理表征。采用循环伏安,恒电流充放电等电化学方法系统研究了所制备样品的电化学性能。结果表明,当Al-Ni层状双氢氧化物(LDH)与还原氧化石墨烯(rGO)的配比为96.2∶3.8时,复合物具有最佳的电容性能。在电流密度为1A·g-1时,其比电容高达918.4F·g-1,远高于纯Al-Ni层状双氢氧化物(LDH)的比电容(732F·g-1)。

The reduced graphene oxide/A1-Ni layered doubled-hydroxide composite with different mass ratios were directly prepared by using Ni（NO3 ）2·6H20 and AI（NO3 ）3·9 H2O as the raw material and urea as reductant and precipi tant through hydrothermal method. The structure, chemical groups and morphology of the composite were characterized byusing X-ray diffraction （XRD）, Fourier transform infrared spectrometer （FT-IR）, Raman spectrometer and field emission scanning electron microscopy （FESEM）, respectively. The electrochemical performances of the composite were investigated by cyclic voltammetry,galvanostatic charge-discharge. The experimental results showed that the composite with the massratio of LDH to rGO up to 96. 2·3.8 exhibited optimal capacitive performance and reached the specific capacitances of 918. 4F·g^-1 at the current density of 1 A·g ^-l ,which were much higher in comparison with pure A1-Ni layered doubled- hydroxide （LDH） （732F·g^-1 ）.