title: Polyelectrolyte-functionalized graphene as metal-free electrocatalysts for oxygen reduction.
abstract: 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.
authors.affiliation: Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: Shuangyin
authors.initials: S
authors.lastname: Wang
authors.forename: Dingshan
authors.initials: D
authors.lastname: Yu
authors.forename: Liming
authors.initials: L
authors.lastname: Dai
authors.forename: Dong Wook
authors.initials: DW
authors.lastname: Chang
authors.forename: Jong-Beom
authors.initials: JB
authors.lastname: Baek