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以印尼褐煤为原料、KOH活化法制备的煤基活性炭,采用氨水在高压条件下对其进行改性,应用N2吸附仪、傅里叶变换红外光谱(FTIR)表征了活性炭的孔结构和表面化学性质,测定了活性炭制作的电极在3mol/L KOH电解液中的电化学性能.结果表明,经过氨水高压改性处理的活性炭的比表面积和孔结构变化不大,但改性后活性炭表面的N原子含量增多,活性炭表面负载上一定量的C-N,N-H和-NO2等含氮官能团;改性后活性炭的比电容可达348F/g,比改性前提高27%;改性后活性炭电极的导电性增强,循环充放电性能更好,在42.5mA/g的电流密度下经1 000次循环充放电,比电容的保持率可达98.9%.
The coal-based activated carbon prepared from Indonesia lignite and KOH activation method was modified with ammonia under high pressure. The pore structure and surface chemistry of activated carbon were characterized by N2 adsorption and Fourier transform infrared spectroscopy (FTIR) The electrochemical properties of activated carbon electrode in 3 mol / L KOH electrolyte were measured.The results showed that the specific surface area and pore structure of the activated carbon modified by ammonia were not changed much, but the N The content of atomic increases, a certain amount of nitrogen-containing functional groups such as CN, NH and -NO2 are loaded on the surface of the activated carbon; the specific capacitance of the modified activated carbon can reach 348F / g, which is 27% higher than that before the modification; It has better performance in cycling and charging and discharging. After being charged and discharged at a current density of 42.5mA / g for 1 000 cycles, the specific capacitance can reach 98.9%.