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The resultant N-GN was demonstrated to act as a metal-free electrode with a much better electrocatalytic activity, long-term operation stability and tolerance to crossover effect than Pt for ORR via a fourelectron pathway in alkaline fuel cells. ÀýÈçÕâ¾ä»°Ëµ crossover effect ÊÇʲôÒâ˼ £¿ºÍµç¼«ÓÐʲô¹ØÏµÂ𣿠|
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