Polyelectrolyte-Functionalized Graphene as Metal-Free Electrocatalysts for Oxygen Reduction
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- Polyelectrolyte-Functionalized Graphene as Metal-Free Electrocatalysts for Oxygen Reduction
- Wang, Shuangyin; Yu, Dingshan; Dai, Liming; Chang, Dong Wook; Baek, Jong-Beom
- graphene; PDDA; oxygen reduction reaction; fuel cells; charge transfer
- Issue Date
- AMER CHEMICAL SOC
- ACS NANO, v.5, no.8, pp.6202 - 6209
- 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.
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