Carbon-supported hafnium oxynitride as cathode catalyst for polymer electrolyte membrane fuel cells

► Carbon-supported hafnium oxynitride (HfO x N y -C) as oxygen reduction reaction (ORR) catalyst in acid media. ► The mass ratio of dissolved hafnium from HfO x N y -C immersed in 0.1 mol dm −3 H 2SO 4 to HfO x N y -C saturated at a low level of 0.8–4.0 mg g −1, demonstrating the high stability. ► T...

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