Preparation and electrochemical properties of Ni(OH)2/graphitized carbon nitride/graphene ternary composites
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摘要: 通过水热法获得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质量比对复合材料物理结构以及电化学性能的影响。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、傅里叶转换红外光谱仪(FT-IR)、氮气物理吸脱附仪、透射电子显微镜(TEM)等方法来反应材料的微观结构以及还原程度，使用循环伏安(CV)、恒流充放电(GCD)及电化学交流阻抗(EIS)测试电极材料的电化学性能。结果表明：当Ni(OH)2∶g-C3N4∶RGO=16∶1∶1(质量比)时电极材料呈3D相互交错的片状结构，氧化峰和还原峰的电位差ΔE为0.218 V。在1 A/g的电流密度下，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/graphitized carbon nitride(g-C3N4)/reduced graphene oxide (RGO) ternary synthetics were prepared by a hydrothermal method. The effect of different mass ratios of the three components on the microstructure, morphology and electrochemical properties of the synthetics was investigated. The outside microstructure and extent of redox of the material were characterized by XRD, SEM, FTIR, nitrogen adsorption and TEM. The composite properties of the synthetics were examined use cyclic voltammetry(CV), galvanostatic charge-discharge(GCD) and electrochemical impedance spectroscopy(EIS). The consequences reveal that the ternary composite represents three-dimensional slice space interlaced structure when the quality proportion of Ni(OH)2, g-C3N4 and RGO are 16∶1∶1, and the ΔE is 0.218 V. When the current density is 1 A/g, the specific capacitance of the synthetic material is 516.9 F/g. After 3 000 cycles of charge-discharge, the capacity retention rate is 74.3%, which revealedoutstanding 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, and (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 current density
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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