Abstract: An electrocatalyst including carbon and a nanosheet supported on the carbon. The nanosheet includes a metal ruthenium nanosheet, and a platinum atomic layer formed on an entire surface of the metal ruthenium nanosheet. The metal ruthenium nanosheet is a monoatomic layer, and the platinum atomic layer is a monoatomic layer or a monoatomic layer laminated body.

Abstract: Porous carbon is produced by a method in which a carbon source and a pore-forming agent are added to spherical silica serving as a template, the carbon source is then polymerized and carbonized, and finally the spherical silica serving as a template is removed.

Abstract: An electrocatalyst including carbon and a nanosheet supported on the carbon. The nanosheet includes a metal ruthenium nanosheet, and a platinum atomic layer formed on an entire surface of the metal ruthenium nanosheet. The metal ruthenium nanosheet is a monoatomic layer, and the platinum atomic layer is a monoatomic layer or a monoatomic layer laminated body.

Abstract: A core-shell structure nanosheet includes a metal ruthenium nanosheet, and a platinum atomic layer provided on a surface of the metal ruthenium nanosheet. An electrocatalyst includes carbon, and the core shell structure nanosheet supported on the carbon. A method for manufacturing an electrocatalyst includes applying a ruthenium oxide nanosheet colloid which comprises a ruthenium oxide nanosheet, on carbon to obtain a carbon-supported ruthenium oxide nanosheet, in which the ruthenium oxide nanosheet is supported on the carbon. The carbon-supported ruthenium oxide nanosheet is reduced to obtain a carbon-supported ruthenium metal nanosheet, in which a ruthenium metal nanosheet is supported on the carbon. A platinum atomic layer is provided on a surface of the metal ruthenium nanosheet to obtain the electrocatalyst.

Abstract: To provide a novel core-shell structure type nanosheet and, when used as an electrocatalyst for a fuel cell, a core-shell structure type nanosheet capable of improving catalytic activity and suppressing a deterioration in catalytic performance. The above-described problem is solved by a core-shell structure type nanosheet (10) comprising a metal nanosheet (1) and a platinum atomic layer (2) provided on a surface of the metal nanosheet (1). In this core-shell structure type nanosheet (10), the platinum atomic layer (2) is preferably provided on the entire surface of the metal nanosheet (1). Further, the core-shell structure type nanosheet (10) can be used as a cathode catalyst or an anode catalyst for a fuel cell or the like. The metal nanosheet (1) is preferably within a range of 0.2 to 0.3 nm in thickness, and within a range of several tens of nm to several ?m, inclusive, in length in an in-plane direction.