Abstract: The present invention discloses a tellurium-doped MXene composite material and a preparation method thereof, comprising the following steps: (1) adding MXene and a tellurium source into a dispersant to prepare a dispersion, and then stirring the dispersion; (2) heating the dispersion, reacting, and then cooling; (3) centrifuging the product obtained in the step (2), then washing and drying under vacuum; and (4) placing the dry product obtained in the step (3) into a corundum ark, and then transferring into a tubular furnace, heating under the protection of inert gas, retaining the temperature, and then cooling to obtain the tellurium-doped MXene composite material. The composite material prepared by the present invention can be used as a cathode of a potassium ion battery, which increases the interlamellar spacing, and optimizes an ion diffusion channel, so that the electrochemical performance of the potassium ion battery is improved.

Abstract: The disclosure discloses a co-rotating dual speed multi-screw extruder and a processing method thereof, the co-rotating dual speed multi-screw extruder enables a first screw and a second screw with the same outer diameter to co-rotate at different speed in a barrel, and the two screws wipe with each other, to achieve self-cleaning in processing; and circular arcs meshed with each other are respectively arranged between root diameters and top diameters of the two screws to form a first step structure and a second step structure, thus breaking an axial symmetry of a cross-sectional contour of the screws, and moreover, the first step structure and the second step structure are periodically meshed in a meshing zone in a staggered manner, so that a flow channel in the meshing zone is changed in a topological way, a strong elongation action and a strong disturbance action are effectively introduced in the meshing zone.

Abstract: The present disclosure relates to a vehicle refrigerator, which comprises a body, a refrigerating system and a driving system; the refrigerating system and the driving system are both arranged in the body; the body is removable in a trunk of a vehicle; the driving system is used for driving the refrigerating system to operate normally and comprises an igniter, an air course and an air source, and the igniter is connected with the air source through the air course; and the refrigerating system is used for cooling an inner cavity of the body and is provided with a working medium capable of changing gas and liquid.

Abstract: The present disclosure relates to a refrigerating device, which comprises a condenser, an evaporator, a generator, a recovery tank, a return pipeline and an air pipe. A working medium capable of changing in gas and liquid circulates in the condenser, the evaporator and the generator to cool air in the air pipe. The two ends of the air pipe are extended into a storage area to provide sufficient cold air for the air pipe and ensure an indoor temperature of the storage area.