Palladium and cobalt complexes of substituted quinoline, bipyridine and phenanthroline as catalysts for electrochemical reduction of carbon dioxide

✍ Scribed by A.G.M.Mostafa Hossain; T. Nagaoka; K. Ogura

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 866 KB
• Volume: 42
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/s0013-4686(96)00453-7

✦ Synopsis

The complexes of [M(PPh3)2L]X (M = Pd, Co; L = substituted quinoline, bipyridine and phenanthroline, and X = Cl, Br or Clod) have been found to be an electrocatalyst for the reduction of CO1 in acetonitrile (AN) and AN-water (8% for volume) solutions containing 0.1 M tetraethylammonium perchlorate (TEAP) at a glassy carbon or Pt electrode. The complexes working as the catalyst were [M(PPhJ)*L]X [L = 2-methyl-8-hydroxyquinoline (2-m-8-Hq), 2-quinoxalinol(2-Qui.), I-hydroxyisoquinoline (I-Hiq), 3-hydroxyisoquinoline (3-Hiq), 4,4'-Dimethyl-2,2'-bipyridine

(4,4'-dim-2,2'-Bipy) and 4-methyl-l,lOphenanthroline (4-m-1, lo-Phen)] at the applied potential of -1.30 V t's AgjlO mM Ag+. Under anhydrous conditions, CO was a dominant product with the current efficiency of 83% and the amount was independent of the kind of the catalysts. In the AN-water solution, however, the reduction products were CO and HCOOH in addition to Hz. 0 1997