Water vapor-modified chemically-derived capacitive carbon, and preparation method and use thereof

A method for preparing a water vapor-modified chemically-derived capacitive carbon, comprising:

• (1) using a non-high-temperature-calcined activated carbon, namely, an intermediate of a commercial chemically-derived capacitive carbon, as a base carbon, weighing and filling the base carbon into a corundum boat such that the base carbon is attached to a wall of the corundum boat with a space remaining in a middle part of the corundum boat, and leaving the corundum boat uncovered;
• (2) placing the corundum boat filled with the non-high-temperature-calcined activated carbon in a central zone of a tubular furnace, inserting an end cap to seal the tubular furnace, introducing a nitrogen flow into the tubular furnace, heating to 250° C. at a heating rate of 10° C./min to 15° C./min, stopping the nitrogen flow, introducing water vapor at a flow rate of 0.15 L/min to 0.35 L/min, continuing heating to a temperature of 850° C. to 950° C. at the heating rate of 10° C./min to 15° C./min, and holding at the temperature of 850° C. to 950° C. for 30 min (minutes) to 60 min;
• and
• (3) naturally cooling to 750° C., switching the water vapor to a nitrogen, continuing cooling to room temperature, taking out a resulting product to obtain the water vapor-modified chemically-derived capacitive carbon.