US 12,002,969 B2
Method for producing metal nanoparticles, method for producing membrane electrode assembly, and method for producing polymer electrolyte fuel cell
Hiroshi Yano, Aichi (JP); Tomotaka Saito, Aichi (JP); and Kota Iwasaki, Aichi (JP)
Assigned to TOYOTA BOSHOKU KABUSHIKI KAISHA, Aichi (JP)
Filed by TOYOTA BOSHOKU KABUSHIKI KAISHA, Aichi (JP)
Filed on Mar. 24, 2021, as Appl. No. 17/211,140.
Claims priority of application No. 2020-055733 (JP), filed on Mar. 26, 2020.
Prior Publication US 2021/0305585 A1, Sep. 30, 2021
Int. Cl. B22F 9/02 (2006.01); B22F 1/054 (2022.01); B22F 9/24 (2006.01); H01M 4/88 (2006.01); H01M 4/92 (2006.01); H01M 8/1004 (2016.01); H01M 8/1018 (2016.01); B05D 1/02 (2006.01); H01M 8/10 (2016.01)
CPC H01M 4/926 (2013.01) [B22F 1/054 (2022.01); B22F 9/026 (2013.01); B22F 9/24 (2013.01); H01M 4/881 (2013.01); H01M 4/8842 (2013.01); H01M 4/928 (2013.01); H01M 8/1004 (2013.01); H01M 8/1018 (2013.01); B05D 1/02 (2013.01); B22F 2301/25 (2013.01); B22F 2304/052 (2013.01); B22F 2304/054 (2013.01); H01M 2008/1095 (2013.01); H01M 2300/0082 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for producing metal nanoparticles, the method comprising:
spraying and drying a mixture to form metal nanoparticles, the mixture containing a metal salt and at least one solvent selected from alcohols having 1 or more and 5 or less carbon atoms;
wherein the metal salt is at least one selected from hexachloroplatinic (IV) acid hexahydrate (H2PtCl6·6H2O), tetraamminedichloroplatinum, and platinum bromide (IV) (PtBr4),
wherein the atmospheric temperature during spraying is 10° C. or higher and 80° C. or lower,
wherein the concentration of the metal salt is 0.1 mol·L−1 or more and 50 mol·L−1 or less, and
wherein the metal nanoparticles have an average particle diameter of 0.7 nm or more and less than 2 nm.