title: Synthesis of carboxylate-functionalized graphene nanosheets for high dispersion of platinum nanoparticles based on the reduction of graphene oxide via 1-pyrenecarboxaldehyde.
abstract: A one-step reduction/functionalization strategy for the synthesis of carboxylate-functionalized graphene nanosheets is reported in this paper. 1-pyrenecarboxaldehyde (PCA) is introduced as a new reductant for the chemical reduction of graphene oxide (GO), serving three roles: reducing GO to graphene nanosheets (GNs), stabilizing the as-prepared GNs due to the electrostatic repulsion of the oxidation products of PCA (1-pyrenecarboxylate, PC⁻) on the surface of the GNs and anchoring Pt nanoparticles (Pt NPs) with high dispersion and small particle size. Transmission electron microscopy shows that Pt NPs with an average diameter of 1.3 ± 0.2 nm are uniformly dispersed on the surface of the PC⁻-functionalized GNs (PC⁻-GNs). The obtained Pt NPs/PC⁻-GNs nanohybrids have higher electrocatalytic activity and stability towards methanol oxidation in comparison with Pt NPs supported on GNs obtained by the chemical reduction of GO with the typical reductant, hydrazine.
authors.affiliation: Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, People's Republic of China. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, People's Republic of China.
authors.forename: Yinjie
authors.initials: Y
authors.lastname: Kuang
authors.forename: Jinhua
authors.initials: J
authors.lastname: Chen
authors.forename: Xingliang
authors.initials: X
authors.lastname: Zheng
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Zhang
authors.forename: Qionghua
authors.initials: Q
authors.lastname: Zhou
authors.forename: Cuihong
authors.initials: C
authors.lastname: Lu