Patent number: 7151069
Abstract: The feature of the process for ultra-low alloy catalyst loading electrode according to this invention is to reduce its alloy formation period of aging process subsequent to hydrogen reduction process of catalyst ions after ion exchange process of proton for their ions in the cluster of the polymer electrolyte on the surface of the carbon powder. The process is able to drastically shorten the aging time with temperature rise beyond 200° C. up to 400° C. under hydrogen atmosphere for the formation of alloy catalyst, for example Pt—Ru binary by the additional processes of pre-treatment of substituting K+, Na+, Li+, Rb+, Cs+, Mg2+, Ca2+, Ba2+, Fe2+, Sr2+, Ra2+, Cu2+, Ag+, Zn2+, Ni2+, or Co2+ for proton before the hydrogen reduction process. The further post-treatment of substituting K+, Na+, Li+, Rb+, Cs+, Mg2+, Ca2+, Ba2+, Fe2+, Sr2+, Ra2+, Cu2+, Ag+, Zn2+, Ni2+, or Co2+ for proton before the ion exchange process is more preferable. This new process is little harmful to the CO tolerance performance of PEFC.
Type:
Grant
Filed:
July 16, 2004
Date of Patent:
December 19, 2006
Assignee:
Japan Storage Battery Co., Ltd.
Inventors:
Yoshinobu Yasunaga, Shuji Hitomi
Publication number: 20050026772
Abstract: The feature of the process for ultra-low alloy catalyst loading electrode according this invention is to reduce its alloy formation period of aging process subsequent to hydrogen reduction process of catalyst ions after ion exchange process of their ions and proton in the cluster of the polymer electrolyte on the surface of the carbon powder. The process is able to drastically shorten the aging time with temperature rise beyond 200° C. up to 400° C. under hydrogen atmosphere for the formation of Pt—Ru binary alloy for example catalyst by the additional processes of pre-treatment of K+, Na+, Li+, Rb+, Cs+, Mg2+, Ca2+, Ba2+, Fe2+, Sr2+, Ra2+, Cu2+, Ag+, Zn2+, Ni2+, and Co2+ ions substitution for proton before the hydrogen reduction process. More preference, the further post-treatment of K+, Na+, Li+, Rb+, Cs+, Mg2+, Ca2+, Ba2+, Fe2+, Sr2+, Ra2+, Cu2+, Ag+, Zn2+, Ni2+, and Co2+ ions substitution for proton before the ion exchange process.
Type:
Application
Filed:
July 16, 2004
Publication date:
February 3, 2005
Inventors:
Yoshinobu Yasunaga, Shuji Hitomi