Polyelectrolyte-Functionalized Graphene as Metal-Free Electrocatalysts for Oxygen Reduction

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• 作者：Shuangyin Wang ; Dingshan Yu ; Liming Dai ; Dong Wook Chang ; Jong-Beom Baek
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：August 23, 2011
• 年：2011
• 卷：5
• 期：8
• 页码：6202-6209
• 全文大小：1046K
• 年卷期：0
• ISSN：1936-086X

文摘

Poly(diallyldimethylammonium chloride), PDDA, was used as an electron acceptor for functionalizing graphene to impart electrocatalytic activity for the oxygen reduction reaction (ORR) in fuel cells. Raman and X-ray photoelectron spectroscopic measurements indicate the charge transfer from graphene to PDDA. The resultant graphene positively charged via intermolecular charge-transfer with PDDA was demonstrated to show remarkable electrocatalytic activity toward ORR with better fuel selectivity, tolerance to CO posing, and long-term stability than that of the commercially available Pt/C electrode. The observed ORR electrocatalytic activity induced by the intermolecular charge-transfer provides a general approach to various carbon-based metal-free ORR catalysts for oxygen reduction.