水热法制备掺氮活性炭及其电化学性能研究

Hydrothermal synthesis of nitrogen-doped activated carbon and study on its electrochemical properties

以商业活性碳为原料、氨水为氮源,采用水热法制备掺氮活性炭。采用均匀设计法对实验参数(水热反应温度、时间和氨水用量)进行优化并得到回归方程。利用扫描电子显微镜、傅里叶红外光谱仪、比表面分析仪、循环伏安、恒电流充放电、交流阻抗等对优化条件下制备的掺氮活性炭进行表征。结果表明,优化条件下水热法制备的掺氮活性炭在扫描速率为10 mV/s时比电容达130.1 F/g,与回归方程计算值(133.5 F/g)吻合较好;充放电电流密度为1 A/g时,掺氮后活性炭比电容提升28%;在不同充放电倍率下循环10000圈,比电容保持率达94.9%。

Nitrogen-doped activated carbon is prepared through hydrothermal method with commercial activated carbon as raw material and ammonia as nitrogen source.Experimental parameters(hydrothermal reaction temperature,time and ammonia dosage)are optimized by uniform design experimentation method,and a regression equation is obtained.The nitrogen-doped activated carbon prepared under the optimized conditions is characterized by scanning electronic microscope(SEM),Fourier transform infrared spectrometer(FTIR),specific surface analyzer,cyclic voltammetry(CV),galvanostatic charge-discharge(GCD)and AC impedance(EIS).The results show that the specific capacitance of the nitrogen-doped activated carbon prepared through hydrothermal method under the optimized conditions is 130.1 F·g^(-1) at a scanning rate of 10 mV·s,which is in good agreement with the calculated value(133.5 F·g^(-1)) by the regression equation.The specific capacitance of activated carbon after nitrogen-doping increases by 28%at 1 A·g^(-1) of charge discharge current density.The specific capacitance retention is 94.9%after 10,000 cycles at different charge and discharge rates.