報告書番号

U89001

タイトル（和文）

生体物質を模擬した燃料電池電極触媒の開発－合成ポルフィリンの触媒活性－

タイトル（英文）

DEVELOPMENT OF CATALYST FOR FUEL CELLS BY MIMICING BIO-MATERIALS<REDUCTION OF MOLECULAR OXYGEN TO WATER CATALYZED BY IRON PORPHYRIN>

概要 （図表や脚注は「報告書全文」に掲載しております）

白金に代わる燃料電池触媒として，動物の呼吸作用を模擬した人工酵素の開発を試みた。人工酵素として鉄テトラフェニルポルフィリンモノカルボン酸ペンタデカアミドを合成しその触媒活性を測定した。この化合物は酸素分子を還元して一部水にまで還元する能力のあることが判り，燃料電池の酸素電極触媒として有効な特性を有している。

概要 （英文）

THE DEVELOPMENT OF FUEL CELLS HAS BEEN ONE OF BIG INNOVATIONS IN THIS CENTURY. THE RAPID ADVANCE WILL ENABLE UTILIZATION OF FUEL CELLS AS AN IMPORTANT ELECTRIC GENERATOR IN NEAR FUTURE. FUEL CELLS WHIC USE PHOSPHORIC ACID AS ELECTROLYTE NEED PLATINUM AS A CATALYST. PLATINUM IS RARE METAL AND VERY EXPENSIVE,SO THAT AN ALTERNATIVE CATALYST INSTEAD OF PLATINUM HAS BEEN SOUGHT FROM A VIEWPOINT OF CHEAP AND ABUNDANT MATERIALS. THE RESPIRATORY REACTIONS IN MAMMALS IS VERYSIMILAR TO THE ROLE OF AN OXYGEN ELECTRODE OF FUEL CELLS. THIS SIMILARITY SUGGESTED THAT MIMICING RESPIRATORY REACTIONS WILL TAKE PLACE AS OXYGEN REDUCTION IN FUEL CELLS. SINCE REACTION CENTER OF RESPIRATORY ENZYME WAS GENERALLY CONSISTED OF IRON PORPHYRIN,IRON TETRAPHENYLPORPHYRIN MONOCARBONIC PENTADECAAMIDE WAS SYNTHESIZED TO PREPARE MONO-LAYER OF THE PORPHYRIN ON A GLASSY CARBON ELECTRODE. SOME CATALYTIC ACTIVITIES OF THE PORPHYRIN WERE MEASURED ELECTROCHEMICALLY. THE CARBON ELECTRODE COVERED WITH THE PORPHYRIN CATALYZED REDUCTION OF MOLECULAR OXYGEN TO WATER AT 250 MV FROM NHE. THESE RESULTS SUGGEST THAT THIS PORPHYRIN CAN ACTAS CATALYST OF FUEL CELLS AT MODERATE CONDITIONS.

報告者

キーワード