蒙脱土基氮掺杂多孔碳@MnO_2@PANI三元复合材料的合成及其电化学电容性能研究

Synthesis and electrochemical capacitive performace of montmorillonite-based nitrogen-doped porous carbon@MnO_2@PANI ternary composite

采用蒙脱土为基的新型氮掺杂多孔碳(NMC),通过超声分散法制备NMC@MnO_2复合材料,再与苯胺(ANI)原位聚合得到NMC@MnO_2@PANI复合材料。采用红外光谱、拉曼光谱、X射线衍射和扫描电镜表征复合材料的组成和形貌。复合材料在1mol/L Na_2SO_4电解液中,电流密度0.25A/g时,质量比电容为228.5F/g;1A/g电流密度下,800次循环充放电后,比电容保持率为86%;在1mol/L H_2SO_4酸性电解液中,电流密度0.5A/g时,质量比电容为588.0F/g,在1A/g电流密度下,经过800次循环充放电后,比电容保持率76%。结果表明:NMC@MnO_2@PANI复合材料在中性和酸性电解液中能够表现出较好的电化学电容性能。

Montmorillonite（MMT）was employed as a supporter to prepare a new nitrogen-doped porous complex carbon（NMC）.MnO2 was deposited onto NMC and then aniline was polymerized onto the NMC@MnO2via the in-situ polymerization to obtain the resulting ternary composite NMC@MnO2@PANI.Fourier transform infrared spectroscope,Raman spectra,X-ray diffraction and scanning electron microscope were used to characterize the component,structure and morphology of as-prepared composite.The specific capacitance of NMC@MnO2@PANI was 288.5F/g at 0.25A/g and retained 86% after 800 cycles in 1mol/L Na2SO4 electrolytes.Whereas in 1mol/L H2SO4 solution,the maximum specific capacitance at 0.5A/g reached up to 588F/g,and retained approximately 76% after 800 cycles.The results indicated that the as-obtained NMC@MnO2@PANI ternary composite had an excellent specific capacitance and good cycling stability.