公开(公告)号：US20230369608A1

公开(公告)日：2023-11-16

申请号：US18028135

申请日：2021-09-28

Applicant: N.E. CHEMCAT CORPORATION

Inventor： Yasuhiro Seki ,  Kiyotaka Nagamori ,  Tomoteru Mizusaki ,  Satoshi Aoki ,  Yoko Nakamura ,  Makoto Nishibetto ,  Yuki Takii

IPC: H01M4/90 ,  H01M4/86 ,  H01M4/88 ,  H01M8/1004

CPC classification number: H01M4/9058 ,  H01M4/9083 ,  H01M4/8657 ,  H01M4/8807 ,  H01M4/9016 ,  H01M8/1004 ,  H01M4/8605

Abstract: The catalyst for electrodes comprises: a porous support which has nanopores having a pore diameter of from 1 nm to 20 nm and micropores having a pore diameter of less than 1 nm; and a plurality of catalyst particles which are supported by the support. The catalyst particles are supported by both inner portions and outer portions of mesopores of the support, and contain Pt (zerovalent). If an analysis of the particle size distribution of the catalyst particles is performed using three-dimensional reconstructed images obtained through a STEM-based electron tomography measurement, the condition of formula (S1), namely (100×(N10/N20)≤8.0) is satisfied, where N10 represents the number of noble metal particles that are not in contact with pores having a pore diameter of 1 nm or more; and N20 represents the number of catalyst particles that are supported by the inner portions of the nanopores of the support.

公开(公告)号：US20230335760A1

公开(公告)日：2023-10-19

申请号：US18026553

申请日：2021-09-28

Applicant: N.E. CHEMCAT CORPORATION

Inventor： Yasuhiro Seki ,  Tomoteru Mizusaki ,  Kiyotaka Nagamori ,  Satoshi Aoki ,  Makoto Nishibetto ,  Yoshiyuki Wada ,  Yoko Nakamura

IPC: H01M4/92 ,  H01M4/86 ,  H01M8/1004

CPC classification number: H01M4/926 ,  H01M4/8605 ,  H01M4/921 ,  H01M8/1004

Abstract: This catalyst for electrodes comprises: a porous carbon support which has nanopores having a pore diameter of from 1 nm to 20 nm; and a plurality of catalyst particles which are supported by the support. The catalyst particles contain Pt (zerovalent), and are supported by both inner portions and outer portions of the nanopores of the support. If an analysis of the particle size distribution of the catalyst particles is performed using three-dimensional reconstructed images obtained through a STEM-based electron tomography measurement, the proportion of the catalyst particles supported by the inner portions of the nanoparticles is 50% or more: at least one nanopore is formed in a cubic image having a side of from 20 nm to 50 nm, said cubic image being obtained from a three-dimensional reconstructed image of a catalyst aggregate; and this nanopore has the shape of a continuously extending interconnected pore.

公开(公告)号：US20230126404A1

公开(公告)日：2023-04-27

申请号：US17910153

申请日：2021-03-16

Applicant: N.E. CHEMCAT CORPORATION

Inventor： Yoshiyuki Wada ,  Tomoteru Mizusaki ,  Kiyotaka Nagamori ,  Satoshi Aoki ,  Hiroki Shiina ,  Yasuhiro Seki

IPC: H01M4/92 ,  H01M8/1004 ,  H01M4/86

Abstract: The present invention provides an electrode catalyst which has excellent catalytic activity, and which can contribute to reducing the cost of a polymer electrolyte fuel cell (PEFC). According to the present invention, an electrode catalyst includes a hollow carrier including nanopores having a pore size of 1 to 20 nm, and a plurality of catalyst particles. The catalyst particles are supported both inside and outside the nanopores of the carrier, and comprise (zero-valent) Pt, and when a particle size distribution analysis of the catalyst particles is carried out using a three-dimensional reconstructed image obtained by electron beam tomography measurement employing STEM, the conditions of formula (S1): 100×(N10/N20)≤8.0 are satisfied (in the formula, N10 is the number of noble metal particles not in contact with a pore having a pore size of 1 nm or more, and N20 is the number of catalyst particles supported inside the nanopores of the carrier).

公开(公告)号：US20240120503A1

公开(公告)日：2024-04-11

申请号：US18275864

申请日：2022-02-09

Applicant: N.E. CHEMCAT CORPORATION

Inventor： Kiyotaka Nagamori ,  Tomoteru Mizusaki ,  Satoshi Aoki ,  Yoko Nakamura ,  Yasuhiro Seki

IPC: H01M4/92 ,  H01M4/86 ,  H01M4/88 ,  H01M8/1004

CPC classification number: H01M4/926 ,  H01M4/8605 ,  H01M4/88 ,  H01M8/1004 ,  H01M2008/1095

Abstract: The method of producing an electrode catalyst having a porous carbon support that has nanopores having a pore diameter of 1 to 20 nm and a BET specific surface area of 700 to 900 m2/g, and catalyst particles containing Pt supported on the support, includes: a first step for preparing a powder in which the catalyst particles are supported on the support; and a second step for accommodating the powder obtained through the first step in a flow-type reactor, flowing NH3 gas through the reactor under conditions of a concentration of 10 to 100% and a pressure of 0.1 MPa to 0.5 MPa, and regulating the temperature in the reactor to 500° C. or more and less than the decomposition temperature of ammonia, keeping for 5 to 10 hours to chemically react the powder and the NH3 gas.

公开(公告)号：US20240105965A1

公开(公告)日：2024-03-28

申请号：US18275873

申请日：2022-02-09

Applicant: N.E. CHEMCAT CORPORATION

Inventor： Kiyotaka Nagamori ,  Tomoteru Mizusaki ,  Satoshi Aoki ,  Yoko Nakamura ,  Yasuhiro Seki

IPC: H01M4/92 ,  H01M4/88 ,  H01M8/1004

CPC classification number: H01M4/926 ,  H01M4/8828 ,  H01M4/921 ,  H01M8/1004

Abstract: The method produces an electrode catalyst having a porous carbon support that has nanopores having a pore diameter of 1 to 20 nm, micropores having a pore diameter of less than 1 nm, and a BET specific surface area of 1000 to 1500 m2/g, and catalyst particles containing Pt supported on the support, including: preparing a powder in which the catalyst particles are supported on the support by using the support and raw materials of the catalyst particle; and accommodating the powder obtained through the first step in a flow-type reactor, flowing ammonia gas through the reactor under conditions of a concentration of 10 to 100% and a pressure of 0.1 MPa to 0.5 MPa, and regulating the temperature in the reactor to 500° C. or more and less than the decomposition temperature of ammonia, keeping for 5 to 10 hours to chemically react the powder and the ammonia gas.

公开(公告)号：US20230231148A1

公开(公告)日：2023-07-20

申请号：US17910137

申请日：2021-03-16

Applicant: N.E. CHEMCAT CORPORATION

Inventor： Yoshiyuki Wada ,  Tomoteru Mizusaki ,  Kiyotaka Nagamori ,  Satoshi Aoki ,  Makoto Nishibetto ,  Yasuhiro Seki

IPC: H01M4/92 ,  H01M8/1004 ,  H01M8/2465

CPC classification number: H01M4/926 ,  H01M8/1004 ,  H01M8/2465 ,  H01M8/1018

Abstract: Provided is a catalyst for electrode that has excellent catalytic activity and that is capable of contributing toward lower PEFC costs. This catalyst for electrode includes: a hollow carbon support having nanopores with a pore diameter of 1 to 20 nm; and a plurality of catalyst particles supported on the support. The catalyst particles are supported both inside and outside the nanopores of the support, are composed of (zerovalent) Pt, and when analysis of the particle size distribution of the catalyst particles is performed using three-dimensional, reconstructed images obtained through STEM-based electron tomography measurement, the percentage of catalyst particles supported inside the nanopores is 50% or more.