Nissan Motor Company Limited

Nippon Steel Chemical & Material Co., Ltd.

Tanaka Kikinzoku Kogyo K.k.

Nippon Steel & Sumikin Chemical Co., Ltd.

Ford Motor Company Limited

Daimler Ag

Toyo Tanso Co., Ltd.

Tetsuya Mashio

Atsushi Ohma

Shinichi Takahashi

Ken Akizuki

Yoshitaka Ono

Hiroyuki Tanaka

Koichi Matsutani

Norifumi Horibe

Kazuki Arihara

Hiroshi Iden

Yoshihisa Furuya

Ryoichi Shimoi

Takahiro Morishita

Yoshio Shodai

Takehiko Okui

Atsushi Horai

Hitoshi Nakajima

Katsuichiro Hayakawa

Yoshinori Suzue

Provided is a catalyst having excellent gas transportability. Disclosed is a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein the catalyst includes pores having a radius of less than 1 nm and pores having a radius of 1 nm or more, wherein a pore volume of the pores having a radius of less than 1 nm is 0.3 cc/g support or more or a mode radius of a pore distribution of the pores having a radius of less than 1 nm is 0.3 nm or more and less than 1 nm, and wherein the catalyst metal is supported inside the pores having a radius of 1 nm or more.

Catalyst and electrode catalyst layer, membrane electrode assembly, and fuel cell using the catalyst

Provided is a catalyst layer for fuel cell which has a high catalytic activity and enables maintaining the high catalytic activity. Disclosed is an electrode catalyst layer for fuel cell including a catalyst containing a catalyst carrier having carbon as a main component and a catalytic metal supported on the catalyst carrier, and a polymer electrolyte having a sulfonic acid group (&#x2014;SOH) as an ion exchange group, in which the catalyst has the R' (D&#x2032;/G intensity ratio) of 0.6 or less, which is the ratio of D&#x2032; band peak intensity (D&#x2032; intensity) measured in the vicinity of 1620 cmrelative to G band peak intensity (G intensity) measured in the vicinity of 1580 cmby Raman spectroscopy, and has BET specific surface area of 900 m/g catalyst carrier or more, and mole number of a sulfonic acid group in the polymer electrolyte relative to weight of the catalyst carrier is 0.7 mmol/g or more and 1.0 mmol/g or less.

Electrode catalyst layer for fuel cell, and fuel cell membrane electrode assembly and fuel cell using the catalyst layer

Provided are a carbon powder which can provide a catalyst exhibiting high performance and a catalyst. A carbon powder for fuel cell comprising carbon as a main component, which has a ratio (B/A) of an area B of peak 1 to an area A of peak 0 of more than 0 and 0.15 or less, wherein the area A represents an area of peak 0 at a position of 2&#x3b8;=22.5&#xb0; to 25&#xb0; as observed by XRD analysis when the carbon powder for fuel cell is subjected to heat treatment at 1800&#xb0; C. for 1 hour in an inert atmosphere, and the area B represents an area of peak 1 at a position of 2&#x3b8;=26&#xb0; as observed by XRD analysis when the carbon powder for fuel cell is subjected to heat treatment at 1800&#xb0; C. for 1 hour in an inert atmosphere.

Carbon powder for fuel cell and catalyst, electrode catalyst layer, membrane electrode assembly, and fuel cell using the carbon powder for fuel cell

[Object] Provided is a catalyst having a high catalytic activity. [Solving Means] Disclosed is a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein the catalyst support includes pores having a radius of less than 1 nm and pores having a radius of 1 nm or more, a surface area formed by the pores having a radius of less than 1 nm is equal to or larger than a surface area formed by the pores having a radius of 1 nm or more, and an average particle diameter of the catalyst metal is 2.8 nm or more.

Catalyst and manufacturing method thereof, and electrode catalyst layer using the catalyst

Provided is a catalyst that can exhibit high activity. The catalyst is an electrode catalyst having catalytic metals supported on a catalyst support, in which the catalytic metals include platinum and a metal component other than platinum; the electrode catalyst has mesopores having a mode radius of pore distribution of mesopores having a radius of 1 nm or more, of 1 nm or more and less than 2.5 nm; alloy microparticles of platinum and the metal component other than platinum are supported inside the mesopores; and a molar content ratio of platinum with respect to the metal component other than platinum in the alloy microparticles supported inside the mesopores is 1.0 to 10.0.

Electrode catalyst, and membrane electrode assembly and fuel cell using electrode catalyst

[Object] Provided is a catalyst having excellent gas transportability. [Solving Means] Disclosed is a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein the catalyst includes pores having a radius of less than 1 nm and pores having a radius of 1 nm or more, wherein a pore volume of the pores having a radius of less than 1 nm is 0.3 cc/g support or more or a mode radius of a pore distribution of the pores having a radius of less than 1 nm is 0.3 nm or more and less than 1 nm, and wherein the catalyst metal is supported inside the pores having a radius of 1 nm or more.

Provided is an electrode catalyst layer excellent in gas transportability by using an electrode catalyst layer for fuel cell comprising a catalyst containing a catalyst carrier and a catalytic metal carried on the catalyst carrier and an electrolyte, wherein the catalyst partially is coated with the electrolyte, and a specific surface area of the catalytic metal which gas can reach without passing through an electrolyte is 50% or more, with respect to the total specific surface area of the catalytic metal.

Electrode catalyst layer for fuel cell, method for producing the same, and membrane electrode assembly and fuel cell using the catalyst layer

Provided is a catalyst for fuel cell which has a high catalytic activity and enables maintaining the high catalytic activity. Disclosed is an electrode catalyst for fuel cell comprising a catalyst carrier containing carbon as a main component and a catalytic metal supported on the catalyst carrier, wherein the catalyst has the R' (D&#x2032;/G intensity ratio) of 0.6 or less, which is the ratio of D&#x2032; band peak intensity (D&#x2032; intensity) measured in the vicinity of 1620 cmrelative to G band peak intensity (G intensity) measured in the vicinity of 1580 cmby Raman spectroscopy, and the volume ratio of a water vapor adsorption amount relative to a nitrogen adsorption amount at a relative pressure of 0.5 in adsorption isotherm is 0.15 or more and 0.30 or less.

Electrode catalyst for fuel cell, method for producing the same, electrode catalyst layer for fuel cell comprising the catalyst, and membrane electrode assembly for fuel cell and fuel cell using the catalyst or the catalyst layer

The present invention relates to an electrode catalyst for fuel cell containing a catalyst carrier having carbon as a main component and a catalytic metal carried on the catalyst carrier, wherein the electrode catalyst for fuel cell has a ratio R' (D&#x2032;/G intensity ratio) of a peak intensity of D&#x2032; band (D&#x2032; intensity) measured in the vicinity of 1620 cmto a peak intensity of G band (G intensity) measured in the vicinity of 1580 cmby Raman spectroscopy of more than 0.6 and 0.8 or less, and satisfies at least one of the (a) to (d). According to the present invention, an electrode catalyst for fuel cell excellent in gas transportability is provided.

Electrode catalyst for fuel cell, electrode catalyst layer for fuel cell, method for producing the same, and membrane electrode assembly and fuel cell using the catalyst layer

The present invention is to provide a carbon powder that can provide a catalyst having excellent durability and a catalyst. A carbon powder for catalyst of the present invention is a carbon powder containing as a main component carbon, which has a BET specific surface area per unit weight of 900 m/g or greater, and a ratio R' (D&#x2032;/G intensity ratio) of peak intensity for a D&#x2032;-band (D&#x2032; intensity) measured in the vicinity of 1620 cmto peak intensity for a G-band (G intensity) measured in the vicinity of 1580 cmby Raman spectroscopy of 0.6 or less.

Carbon powder for catalyst, catalyst, electrode catalyst layer, membrane electrode assembly, and fuel cell using the carbon powder

The present invention has an object to provide a catalyst having excellent oxygen reduction reaction activity. The present invention relates to a catalyst comprising a catalyst support and a catalyst metal supported on the catalyst support, wherein a specific surface area of the catalyst per support weight is 715 m/g support or more or a covering ratio of the catalyst metal with an electrolyte is less than 0.5, and an amount of an acidic group of the catalyst per support weight is 0.75 mmol/g support or less.

This electrode catalyst layer for fuel cells is provided with: an electrode catalyst that comprises a conductive carrier and platinum-containing metal particles supported on the surface of the conductive carrier; and an ionomer that covers the electrode catalyst. This electrode catalyst layer for fuel cells is characterized in that the average thickness of the ionomer is 2.4 nm or less. This electrode catalyst layer for fuel cells is capable of having a good balance between proton transport properties and transport properties for a gas such as an oxidant gas or a fuel gas even in cases where the amount of supported platinum is decreased. In addition, an electrode for fuel cells, a membrane electrode assembly for fuel cells, and a fuel cell, each having good current-voltage characteristics, can be obtained using the above-described electrode catalyst layer for fuel cells.

Electrode catalyst layer for fuel cells, electrode for fuel cells, membrane electrode assembly for fuel cells, and fuel cell

The disclosure describes fuel cell systems including a fuel cell stack that generates electricity, an exhaust valve that externally vents a fuel gas from a fuel chamber of the fuel cell stack, and a controller that computes an estimated time to replace an oxidant gas in at least the fuel chamber with a newly supplied fuel gas, wherein at a time of starting-up the fuel cell system the controller maintains the exhaust valve in an open position for the estimated time. In some embodiments, the controller computes the estimated time as a summation of a first time Tmeasured from the fuel cell start-up time to a time when contents of a supply conduit are replaced with fuel gas, a second time Tmeasured from the time when contents of a supply conduit are replaced with fuel gas to a time when contents of the fuel chamber are replaced with fuel gas, and a third time Tmeasured from the time when contents of the fuel chamber are replaced with fuel gas to a time when contents of the exhaust conduit are replaced with fuel gas. The disclosure further describes methods of operating a fuel cell system, particularly during fuel cell start-up.

Growing community of inventors

Kanagawa, Japan

Tetsuya Mashio