CO reduces nickel(2+) cyanides in basic solution to form tetrahedral Ni(0)(CN)(CO)3(-) or Ni(0)(CN)2(CO)2(2-). Both nickel(0) complexes can be oxidized back to nickel(2+) cyanide/hydroxide so that they behave as CO oxidation catalysts in basic solution. A primitive fuel cell was constructed to demonstrate the feasibility of a CO-powered fuel cell.
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