Read e-book online Assessment of Research Needs for Advanced Fuel Cells PDF

By S. S. Penner

ISBN-10: 0080339905

ISBN-13: 9780080339900

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Extra info for Assessment of Research Needs for Advanced Fuel Cells

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6 - 1 : a f t e r a m i n i m a l e f f i c i e n c y i s r e a c h e d , c a p i t a l - c o s t c o n s i d e r a t i o n s ( i . e . , t h e i n t e r c e p t in F i g . 2. 6-1) b e c o m e p a r a m o u n t . F o r $ 4 / 1 0 ^ B T U fuel, the y e a r l y fuel c o s t for a h y p o t h e t i c a l b a s e l o a d a n d 100% e f f i c i e n t F C w o u l d b e $ 1 2 0 / k W , w h i c h m u s t c o m p e t e w i t h t h e $ 3 9 3 / k W - y (fuel p l u s c a p i t a l ) of a b a s e l o a d c o a l p l a n t .

In addition, the m a t e r i a l s t e c h n o l o g y a v a i l a b l e at that t i m e for u s e in h i g h - t e m p e r a t u r e a c i d e l e c ­ t r o l y t e s under highly oxidizing and r e d u c i n g conditions w a s l i m i t e d , and acid handling w a s c o m ­ p l i c a t e d by t h e u s e of f r e e - e l e c t r o l y t e c e l l s . O n l y n o b l e m e t a l s . T a , a n d Nb a p p e a r e d t o b e s t a b l e , and the Ta r e q u i r e d g o l d - p l a t i n g to g i v e sufficient e l e c t r i c a l c o n d u c t i v i t y for u s e a s an e l e c t r o d e - s u p p o r t s c r e e n or a s a b i p o l a r p l a t e .

Many c a r b o n s , particularly furnace b l a c k s , had sufficiently high s u r f a c e a r e a and c o r r o ­ s i o n r e s i s t a n c e for t h i s a p p l i c a t i o n . A n e a r l y f a v o r i t e w a s V u l c a n X C - 7 2 (250 m ^ / g m ) , the m o s t c o n d u c t i n g f u r n a c e b l a c k p r o d u c e d by Cabot C o r p . T h e m o s t e f f e c t i v e m e t h o d of p r o d u c i n g h i g h ­ l y d i s p e r s e d P t o n s u c h s u p p o r t s w a s v i a P t - s u l f u r c o m p l e x e s p r o d u c e d b y r e d u c t i o n of, f o r e x a m p l e , c h l o r o p l a t i n i c a c i d b y s u l f i t e s , f o r w h i c h t h e k e y p a t e n t s a r e g i v e n u n d e r R e f .

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Assessment of Research Needs for Advanced Fuel Cells by S. S. Penner


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