Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Kensaku Kodama

Toshiyuki Suzuki

Manabu Kato

Hiroo Yoshikawa

Kazutaka Kimura

Noriyuki Kitao

Yu Morimoto

Kazuhisa Yano

Fusayoshi Miura

Tsutomu Ochi

Tomohiro Takeshita

Toshiaki Kusakari

Hajime Murata

Yoriko Hasegawa

Shuhei Yoshino

Masahito Kosai

Yoshio Sageshima

Masanori Inaba

Shuji Kajiya

Keiichiro Oishi

Porous oxide semiconductor particles have a connected structure in which porous primary particles having an aggregate of crystallites composed of an oxide semiconductor are connected to each other and have a specific surface area of 60 m/g or more. The porous oxide semiconductor particles have preferably a pore diameter of 1 nm or more and 20 nm or less. The porous oxide semiconductor particles have preferably a tap density of 0.005 g/cmor more and 1.0 g/cmor less. The oxide semiconductor is preferably SnOor SnOdoped with at least one element selected from the group consisting of Nb, Sb, W, Ta, and Al.

Porous oxide semiconductor particles

The present disclosure provides a method of shortening an aging period of a polymer electrolyte fuel cell immediately after production to increase shipping inspection speed and production speed of the polymer electrolyte fuel cell. The present disclosure relates to an aging method of a fuel cell which comprises a membrane electrode assembly comprising a fuel electrode, an electrolyte membrane, and an oxidant electrode, wherein the method comprises applying a potential cycle, wherein the lowest cell potential when a load is applied and OCV are alternately repeated between the fuel electrode and the oxidant electrode, and in the potential cycle, fuel gas is supplied to the fuel electrode, and oxidant gas and carbon monoxide gas are supplied to the oxidant electrode.

Aging method of fuel cell

First, a reaction gas is supplied to a fuel cell stack including a laminate of solid polymer electrolyte fuel cells and power generation is performed so that a temperature of the fuel cell stack reaches 65&#xb0; C. or higher (heating power generation step). Next, the reaction gas is supplied to the fuel cell stack and the power generation is performed under a condition in which relative humidity is 100% or more (cleaning power generation step). Cooling water of room temperature may be supplied to the fuel cell stack from the outside before the cleaning power generation step is performed after the heating power generation step is completed, or after the cleaning power generation step is completed (quenching step).

Method of running-in operation of fuel cell

An oxygen evolution catalyst includes a core and a shell covering the surface of the core. The core includes ruthenium oxide or metal ruthenium in at least a surface portion. The shell includes titania or a composite oxide of titanium and ruthenium. Such an oxygen evolution catalyst is obtained by (a) dispersing core particles each including ruthenium oxide or metal ruthenium in at least a surface portion in a solvent to obtain a dispersion, (b) adding a Ti source to the dispersion to produce precursor particles in which the surface of each core particle is covered with a titania precursor, and (c) collecting the precursor particles from the dispersion and heat-treating the precursor particles after drying.

Oxygen evolution catalyst

A membrane electrode assembly according to the invention includes a solid polymer electrolyte membrane and an electrode joined to each of two sides of the solid polymer electrolyte membrane. The solid polymer electrolyte membrane is such that some or all of the protons included in the entire solid polymer electrolyte membrane, a band region, or a non-power generating region are ion exchanged with one or more cations selected from among complex cations, class four alkylammonium cations, and high valence cations. In addition or alternatively, the solid polymer electrolyte membrane includes an organo-metalloxane polymer obtained by impregnating the entire solid polymer electrolyte membrane, the non-power generating region, or the band region with an organo-metalloxane monomer that includes an ammonium cation or a class four ammonium cation at its terminus and then hydrolyzing and polycondensing the organo-metalloxane monomer.

Membrane electrode assembly and polymer electrolyte membrane fuel cell

Growing community of inventors

Nagakute, Japan

Kensaku Kodama