Cyanamide-derived non-precious metal catalyst for oxygen reduction

Cyanamide was used in the preparation series of metal-nitrogen-carbon (M-N-C) oxygen reduction catalysts. The best catalyst, treated at 1050 degrees C, shows good performance versus previously reported non-precious metal catalysts with an OCV similar to 1.0 V and a current density of 105 mA/cm(2) (iR-corrected) at 0.80 V in H-2/O-2 fuel cell testing (catalyst loading: 4 mg cm(-2)). Although nitrogen content has been previously correlated positively with ORR activity, no such trend is observed here for any nitrogen type. The combined effects of nitrogen and sulfur incorporation into the carbon may account for the high activity of the 1050 degrees C catalyst. (C) 2010 Elsevier B.V. All rights reserved.