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Aiming at the problems of high chemical inertness of high-rank anthracite, high energy consumption and high pollution of traditional activation process, a two-step process of potassium ferrate activation－thiourea gas phase doping was used to prepare high-performance nitrogen and sulfur co-doped porous carbon. The effects of activation temperature, mass ratio of potassium ferrate to coal and activation time on the preparation of porous carbon CDC were investigated by Box-Behnken method. Then, nitrogen and sulfur were doped into thiourea gas phase to obtain NS-3-850. The microstructure and surface chemical properties were characterized by SEM-EDS, XRD, Raman and XPS. The electrochemical properties were tested by CV and GCD methods. The results show that the method effectively constructs a hierarchical pore structure dominated by micropores and coordinated by mesopores, and successfully introduces nitrogen-and sulfur-containing functional groups into the carbon skeleton. The obtained nitrogen and sulfur co-doped porous carbon has a high specific surface area (1 393 m2/g) and an optimized mesoporous ratio (33.69%). The pore structure is suitable for ion diffusion and the surface functional groups are improved. NS-3-850 exhibits good energy storage performance in 6 mol/L KOH electrolyte, and the specific capacitance is 220 F/g at current density of 0.5 A/g. The preparation process provides a feasible technical path for the directional conversion and functionalization of inert coal by wet chemical means.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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