基于聚多巴胺的氮掺杂碳材料的制备及其电化学性能

多孔碳材料由于高的比表面积、优异的电子传导率、良好的化学稳定性等优点在超级电容器电极材料领域被广泛研究。 碳材料的组成及表面孔结构直接影响其电化学性能,为进一步提高碳材料的电容性能,本文首次以聚多巴胺球为前体,KOH为活化剂,通过高温碳化成功制备了良好电化学性能的氮掺杂多孔碳材料。 通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、 X射线粉末衍射(XRD)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)和Raman光谱等对所制备的氮掺杂多孔碳材料进行了形貌及结构组成的表征。 在6 mol/L KOH电解液中, 采用循环伏安、恒电流充放电对多孔碳材料的电化学性能进行了研究。 结果表明,由于双电层电容和赝电容的协同作用,在电流密度为1 A/g时,材料的比电容可达269 F/g,充放电循环1000圈后电容仍可保留初始值的93.5%。

Preparation and Electrochemical Performance of Nitrogen Doped Carbon Materials Based on Polydopamine

Porous carbon materials have been extensively studied in the field of electrode materials for supercapacitor due to their high surface area, excellent electron conductivity and good chemical stability. The composition and pore structure of carbon materials directly affect their electrochemical performance. In order to further improve their capacitance performance, nitrogen doped carbon materials with excellent electrochemical performance were prepared for the first time by high temperature carbonization with polydopamine as precursor and KOH as activator. The surface morphology, structure and composition of the obtained N-doped porous carbon materials were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction spectra(XRD), Fourier transform infrared spectrometer(FT-IR), X-ray photoelectron spectroscopy(XPS) and Raman spectroscopy, respectively. The electrochemical performances were investigated by cyclic voltammetry and galvanostatic charge/discharge in 6 mol/L KOH electrolyte. The results show that the specific capacitance of the material can reach 269 F/g at the current density of 1 A/g due to the synergistic effect of double layer capacitance and pseudocapacitance, and the capacitance still remains 93.5% after 1000 charge-discharge cycles.