Preparation and Electrochemical Properties of Ni(OH)2/Graphite Phase Carbon Nitride/Graphene Ternary Composites
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摘要: 本文通过水热法制备Ni(OH)2/石墨相氮化碳(g-C3N4)/石墨烯(RGO)三元复合材料，研究了Ni(OH)2∶g-C3N4∶RGO质量比对复合材料结构、形貌和电化学性能的影响。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶转换红外光谱(FT-IR)、氮气物理吸脱附、透射电子显微镜(TEM)等测试手段表征材料的表面微观结构和还原程度，采用循环伏安(CV)、恒流充放电(GCD)及电化学交流阻抗(EIS)测试复合材料的电化学性能。结果表明：当Ni(OH)2∶g-C3N4∶RGO=16∶1∶1(质量比)时三元复合材料为三维片层空间互相交错结构，氧化峰和还原峰的电位差ΔE为0.218 V。当电流密度为1 A/g时，复合材料的比电容为516.9 F/g，充放电3000次循环后，容量保持率达74.3%，显示出良好的电化学性能。Abstract: Ni(OH)2/graphite phase carbon nitride(g-C3N4)/graphene(RGO) ternary composites were prepared by hydrothermal method, the effect of mass ratio of Ni(OH)2∶g-C3N4∶RGO on the structure, morphology and electrochemical properties of the composites was investigated. The surface microstructure and degree of reduction of the material were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR), Physical adsorption and desorption of nitrogen, transmission electron microscope (TEM). The composite properties of the composite were tested by cyclic voltammetry(CV), galvanostatic charge-discharge(GCD) and electrochemical impedance spectroscopy(EIS). The results show that the ternary composite represents three-dimensional slice space interlaced structure when the quality proportion of Ni(OH)2, g-C3N4 and RGO is 16∶1∶1, and the potential difference ΔE between the oxidation peak and the reduction peak is 0.218 V. When the current density was 1 A/g, the specific capacitance of the composite material is 516.9 F/g, After 3000 cycles of charge-discharge, the capacity retention rate reaches 74.3%, which showed good electrochemical performance.
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图 2 (a) M-12, (b) M-14, (c) M-16, (d)M-18的SEM图, (e) M-16的TEM图, (f) M-16的HRTEM和SAED图, (g) M-16中Ni, C, N, O的EDS图
Figure 2. SEM images of (a) M-12、(b) M-14、(c) M-16、(d)M-18, TEM image of M-16 and (f) HRTEM image and SAED patterns of M-16、(g) EDS maps of Ni, C, N and O in M-16.
图 4 M-16的氮气吸附-脱附曲线以及孔径分布图
Figure 4. N2 adsorption-desorption curve and pore size distribution of M-16
图 5 M-X电极材料在10 mV/s速率下CV曲线
Figure 5. CV curves of M-X electrode materials at scan rate of 10 mV/s
图 6 M-16电极材料在不同扫描速率下CV曲线
Figure 6. CV curves of M-16 electrode materials at different scan rates
图 8 M-X电极材料在1 A/g电流密度下的GCD曲线
Figure 8. GCD curves of M-X electrode materials at current density of 1 A/g
图 9 不同电极材料在1 A/g电流密度下的GCD曲线
Figure 9. GCD curves of different electrode materials at current density of 1 A/g.
图 10 M-16电极材料不同电流密度下的GCD曲线
Figure 10. GCD curves of M-16 electrode materials at different scan rates
图 11 M-16电极材料在5 A/g电流密度下的循环稳定性曲线
Figure 11. Cyclic stability curve of M-16 electrode material at current density of 5 A/g
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