Abstract: The present invention relates to a rechargeable battery, and a rechargeable battery including: a liquid cathode portion including a sodium-containing solution and a cathode current collector impregnated in the sodium-containing solution; an anode portion including a liquid organic electrolyte, an anode current collector impregnated in the liquid organic electrolyte, and an anode active material provided in the surface of the anode current collector; and a solid electrolyte provided between the cathode portion and the anode portion can be provided.

Abstract: The present invention relates to a rechargeable battery, and a rechargeable battery including: a liquid cathode portion including a sodium-containing solution and a cathode current collector impregnated in the sodium-containing solution; an anode portion including a liquid organic electrolyte, an anode current collector impregnated in the liquid organic electrolyte, and an anode active material provided in the surface of the anode current collector; and a solid electrolyte provided between the cathode portion and the anode portion can be provided.

Abstract: Provided are a nanoporous tungsten carbide catalyst that can be used as an electrode of a fuel cell and a preparation method thereof. The nanoporous tungsten carbide catalyst includes tungsten carbide crystalline particles and has nanopores of a mean pore diameter ranging from 2 nm to 5 nm and a nanopore volume of 0.08 to 0.25 cm3 per gram of the catalyst. The nanoporous tungsten carbide catalyst or the nanoporous tungsten carbide catalyst supported with a metallic active component has high electrochemical activity and enhanced resistance to poisoning by carbon monoxide (CO). Therefore, even after use for an extended period of time, the nanoporous tungsten carbide catalyst of the present invention can maintain a long-term high catalytic activity.