Abstract
Abstract Partially oxidized titanium carbonitride (TiCNO), newly synthesized from partial oxidation of TiC 0.5 N 0.5 powder under a flow rate of 500 cm 3 min −1 of nitrogen containing 4% H 2 and 0.5% O 2 by volume at 800 °C for 20 h, is examined as a non-platinum cathode for polymer electrolyte membrane fuel cells (PEMFCs). TiCNO shows significantly enhanced electrocatalytic activity for the oxygen reduction reaction (ORR) compared with as-prepared TiC 0.5 N 0.5 and fully oxidized TiO 2 . In addition, TiCNO has a high chemical stability in 0.1 mol dm −3 sulfuric acid at 30 °C.
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