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Edge-iodine/sulfonic acid-functionalized graphene nanoplatelets (ISGnPs) were prepared by two-step sequential ball-milling of graphite in the presence of iodine and sulfur trioxide. The resultant ISGnPs are highly dispersible in various polar solvents and the ORR performance of ISGnPs in an alkaline medium is superior to commercial Pt/C in terms of electrocatalytic activity and cycle stability.
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Baek et al. (2014) studied this question.
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