Methanol/Air Fuel Cells

✍ Scribed by W. Vielstich

• Publisher: John Wiley and Sons
• Year: 1964
• Tongue: English
• Weight: 127 KB
• Volume: 3
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.196403223

✦ Synopsis

Among intermetallic phases, thc N i Ah typc represents a transition between mainly metallic and essentially nonmetallic phases. The B atoms occupy a close-packed hexagonal unit cell with a c/a ratio of 1.633. Chains of A atoms fit into the octahedral voids. With increasing metallic character of the €3 partner, both the cfa ratio and the heteropolar forces between the A and B partners decrease. Homopolar forces due to coupling between d-electrons of the A atom are superimposed. The electrical conductivity behavior suggests discrete d-levels for c/a > 1.633, and bands for c/a < 1.633.