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# c19) United States c12) Patent Application Publication 

# Okada et al. 

# (54) ELECTRODE CATALYST FOR FUEL CELL 

(75) Inventors: Tatsuhiro Okada, Tsukuba-shi (JP); Nobuyoshi Koshino, Tsukuba-shi (JP); Tadafumi Matsunaga, Tsukuba-shi (JP); Hideyuki Higashimura, Tsukuba-shi (JP); Katsuhiro Suenobu, Tsukuba-shi (JP); Masatoshi Iwata, Tsukuba-shi (JP) 

Correspondence Address: SUGHRUE MION, PLLC 2100 PENNSYLVANIA AVENUE, N.W., SUITE 800 WASHINGTON, DC 20037 (US) 

(73) Assignees: National Institute of Advanced Science and Technology, Chiyoda-ku, Tokyo (JP); Sumitomo Chemical Company, Limited, Chuo-ku, Tokyo (JP) 

(21) Appl. No.: 12/530,187 

(22) PCT Filed: Mar. 10, 2008 

<img src='content_image/929969.jpg'>

(86) PCT No.: § 371 (c)(l), (2), ( 4) Date: PCT/JP2008/054330 Sep.4,2009 

## (30) Foreign Application Priority Data 

(51) Int. Cl. HOJM 4186 (2006.01) 

(52) U.S. Cl. .......................................................... 429/40 

## (57) ABSTRACT 

An electrode catalyst for fuel cell, containing a multinuclear complex, in which the multinuclear complex contains 2 to 4 transition metal atoms coordinated with a ligand having 5 to 15 coordination atoms in its molecule; and an electrode cata› lyst for fuel cell, comprising a mononuclear metal complex containing, as a ligand, an organic compound containing two or more phenol rings and three or more aromatic hetero› cycles. 

US 20100129698Al 

# c10) Pub. No.: US 2010/0129698 Al 

# (43) Pub. Date: May 27, 2010 

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## Publication Classification 

