TERNARY PLATINUM ALLOY CATALYST

PROBLEM TO BE SOLVED: To provide a ternary platinum alloy catalyst exhibiting improved lifetime stability without reduction in activity.SOLUTION: The invention provides a ternary platinum alloy catalyst PtXY suitably used in electrodes of fuel cells, where X is nickel, cobalt, chromium, copper, tita...

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Hauptverfasser:	BRIAN RONALD THEOBALD, THOMPSETT DAVID, RALPH THOMAS R, SARAH BALL
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BASIC ELECTRIC ELEMENTS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY ELECTRICITY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a ternary platinum alloy catalyst exhibiting improved lifetime stability without reduction in activity.SOLUTION: The invention provides a ternary platinum alloy catalyst PtXY suitably used in electrodes of fuel cells, where X is nickel, cobalt, chromium, copper, titanium or manganese, and Y is tantalum or niobium. In the alloy, the atomic percentage of platinum is 46-74 atom%, the atomic percentage of X is 25-40 atom% and the atomic percentage of Y is 1-20 atom%. The catalyst has particular use as an oxygen reduction catalyst in fuel cells, and in particular in phosphoric acid fuel cells. 【課題】活性の低下がなく、改善された寿命安定性を示す、三元白金合金触媒の提供。【解決手段】燃料電池の電極において好適に使用される三元白金合金触媒ＰｔＸＹであって、Ｘが、ニッケル、コバルト、クロム、銅、チタニウム、又はマンガンであり、Ｙが、タンタル又はニオブであり、前記合金において、白金の原子百分率が４６〜７４ａｔ％であり、Ｘの原子百分率が２５〜４０ａｔ％、及びＹの原子百分率が１〜２０ａｔ％である、三元白金合金触媒。この触媒は、燃料電池、とりわけ、リン酸燃料電池において、酸素還元触媒として、特に使用される。【選択図】なし