In this work, carbon materials are prepared by sintering polyethersulfone membrane as precursor, and oxygen-containing functional groups are introduced into its surface with concentrated nitric acid as modifier. Then, the characteristics of oxygen-containing functional groups are used to adsorb iron ions to prepare iron-doped carbon material. And after doping with iron, the material not only has higher capacitance (227.9 F/g at 0.5 A/g), but also has better rate performance and cycling stability. Specifically, with the current densities increased from 0.5 A/g to 5 A/g, the retention rate of PES-C-Fe3 is 74.84 %, while that of the original carbon material is only 51.83 %. Moreover, the cycle life of the original carbon material decreases to 77.55 % after 1, 000 cycles, but PES-C-Fe3 can maintain 82.79 % of the initial capacitance after 10, 000 cycles.

在该工作中，通过烧结聚醚砜膜作为前体来制备碳材料，并用浓硝酸作为改性剂将含氧官能团引入其表面。然后，利用含氧官能团的特性吸附铁离子，从而制备掺杂铁的碳材料。在掺杂铁后，该材料不仅具有更高的电容（0.5 A / g时为227.9 F / g），而且还具有更高的倍率性能和循环稳定性。具体地，当电流密度从0.5A / g增加到5A / g时，PES-C-Fe3的保留率为74.84％，而原始碳材料的保留率为仅51.83％。此外，经过1000次循环后，原始碳材料的循环寿命降低至77.55％，但PES-C-Fe3在10次循环后仍可保持初始电容的82.79％，