Abstract: Provided is a magnesium secondary battery including a positive electrode member 23 including at least a positive electrode active material layer 23B, a separator 24 disposed facing the positive electrode member 23, a negative electrode member 25 containing magnesium or a magnesium compound disposed facing the separator 24, and an electrolytic solution containing a magnesium salt. The positive electrode active material layer 23B includes magnesium sulfide having a zinc blende type crystal structure.

Abstract: Provided is a magnesium secondary battery including a positive electrode member 23 including at least a positive electrode active material layer 23B, a separator 24 disposed facing the positive electrode member 23, a negative electrode member 25 containing magnesium or a magnesium compound disposed facing the separator 24, and an electrolytic solution containing a magnesium salt. The positive electrode active material layer 23B includes magnesium sulfide having a zinc blende type crystal structure.

Abstract: In one example embodiment, a core-shell type platinum-containing catalyst is allowed to reduce the amount of used platinum and has high catalytic activity and stability. In one example embodiment, the core-shell type platinum-containing catalyst includes a core particle (with an average particle diameter R1) made of a non-platinum element and a platinum shell layer (with an average thickness ts) satisfying 1.4 nm?R1?3.5 nm and 0.25 nm?ts?0.9 nm. The core particle includes an element satisfying Eout?3.0 eV, where average binding energy relative to the Fermi level of 5d orbital electrons of platinum present on an outermost surface of the shell layer is Eout. In a fuel cell including a platinum-containing catalyst which contains a Ru particle as a core particle, the output density at a current density of 300 mA/cm2 is 70 mW/cm2 or over, and an output retention ratio is approximately 90% or over.

Abstract: A core-shell type platinum-containing catalyst being allowed to reduce the amount of used platinum and having high catalytic activity and stability and a method of producing the same, an electrode and an electrochemical device are provided. The platinum-containing catalyst includes: metal particles each including a core particle including a metal atom except for platinum or an alloy of a metal atom except for platinum and a shell layer, including platinum on a surface of the core particle, the metal particles being supported by a conductive carrier and satisfying 0.25 nm?ts?0.9 nm and 1.4 nm?R1?3.5 nm, where an average thickness of the shell layer is ts and an average particle diameter of the core particle is R1.

Abstract: In one example embodiment, a core-shell type platinum-containing catalyst is allowed to reduce the amount of used platinum and has high catalytic activity and stability. In one example embodiment, the core-shell type platinum-containing catalyst includes a core particle (with an average particle diameter R1) made of a non-platinum element and a platinum shell layer (with an average thickness ts) satisfying 1.4 nm?R1?3.5 nm and 0.25 nm?ts?0.9 nm. The core particle includes an element satisfying Eout?3.0 eV, where average binding energy relative to the Fermi level of 5d orbital electrons of platinum present on an outermost surface of the shell layer is Eout. In a fuel cell including a platinum-containing catalyst which contains a Ru particle as a core particle, the output density at a current density of 300 mA/cm2 is 70 mW/cm2 or over, and an output retention ratio is approximately 90% or over.