Hitachi Maxell, Limited

Kohei Ugawa

Hideo Daimon

Masaki Sekine

Shoji Saibara

Hiroshi Kashino

Norihisa Yoshimoto

Yukiko Yamamoto

In a membrane electrode assembly of the present invention, at least one of a catalyst layer of an oxygen electrode and a catalyst layer of a fuel electrode includes a supported catalyst supporting a metal catalyst containing a platinum group element, a proton conductive polymer electrolyte, and at least one selected from (a) a complex-forming agent having a ligand that forms coordinate bonds with ions of the platinum group element and forms a complex, the ligand containing oxygen as a coordinating atom, (b) a complex of the platinum group element, a ligand of the complex containing oxygen as a coordinating atom, and (c) carbon that has a BET specific surface area of 100 m/g or greater, satisfies at least one of (i) an R value of Raman spectrum of 0.5 or less and (ii) a lattice spacing dbetween (002) planes of 0.35 nm or less, and does not support the metal catalyst. With the use of the membrane electrode assembly of the present invention, it is possible to provide a polymer electrolyte fuel cell that has high durability and a long service life.

Membrane electrode assembly and polymer electrolyte fuel cell

A fuel cell has an anode, a cathode, and a polymer electrolyte membrane placed between the anode and the cathode. The anode includes a catalyst which is composed of binary or ternary particulates deposited on a carbon support. The particulate is represented by a general formula: Pt&#x2014;P, wherein Ru is optionally present. The content of P is in a range of 2 mol % to 50 mol % based on the total moles of Pt or Pt&#x2014;Ru. The diameter of the catalyst particulates is in range from 1 to 3 nm.

Fuel cell and membrane electrode assembly

A fuel cell includes a fuel electrode, an oxygen electrode, and a polymer electrolyte membrane placed between the fuel electrode and the oxygen electrode. The fuel electrode and/or the oxygen electrode include a catalyst composed of a particle containing at least Pt and P and a carbon support.

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Ibaraki, Japan

Kohei Ugawa