title: Polyallylamine functionalized palladium icosahedra: one-pot water-based synthesis and their superior electrocatalytic activity and ethanol tolerant ability in alkaline media.
abstract: Polyallylamine (PAH) functionalized Pd icosahedra are synthesized through a simple, one-pot, seedless and hydrothermal growth method. Herein, PAH is used efficiently as a complex-forming agent, capping agent, and facet-selective agent. The strong interaction between PAH and Pd atom sharply changes the electronic structure of Pd atom in the Pd icosahedra. The protective function of PAH layers and enhanced antietching capability of Pd atom are responsible for the formation of the Pd icosahedra. Very importantly, the as-prepared PAH functionalized Pd icosahedra exhibit superior electrocatalytic activity and ethanol tolerant ability toward the oxygen reduction reaction (ORR) compared to the commercially available Pt black in alkaline media. At 0.95 V (vs RHE), the ORR specific kinetic current density at the Pd icosahedra is 4.48 times higher than that at commercial Pt black. The fact demonstrates the appropriate surface modification of the Pd nanoparticles by nonmetallic molecules can be regarded as an effective way to enhance the electrocatalytic activity toward the ORR.
authors.affiliation: Jiangsu Key Laboratory of Power Batteries, Laboratory of Electrochemistry, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P R China.
authors.forename: Gengtao
authors.initials: G
authors.lastname: Fu
authors.forename: Xian
authors.initials: X
authors.lastname: Jiang
authors.forename: Lin
authors.initials: L
authors.lastname: Tao
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Lin
authors.forename: Yiming
authors.initials: Y
authors.lastname: Zhou
authors.forename: Yawen
authors.initials: Y
authors.lastname: Tang
authors.forename: Tianhong
authors.initials: T
authors.lastname: Lu
mesh_terms: D002384:Catalysis; D055664:Electrochemical Techniques; D004566:Electrodes; D000431:Ethanol / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010165:Palladium / Q000737:chemistry*; D010316:Particle Size; D011073:Polyamines / Q000737:chemistry*; D012972:Sodium Hydroxide / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D011073:Polyamines; D014867:Water; C063994:polyallylamine; D000431:Ethanol; D012972:Sodium Hydroxide; D010165:Palladium; D010100:Oxygen