title: Characterization of Au and Bimetallic PtAu Nanoparticles on PDDA-Graphene Sheets as Electrocatalysts for Formic Acid Oxidation.
abstract: Nanocomposite materials of the Au nanoparticles (Au/PDDA-G) and the bimetallic PtAu nanoparticles on poly-(diallyldimethylammonium chloride) (PDDA)-modified graphene sheets (PtAu/PDDA-G) were prepared with hydrothermal method at 90 °C for 24 h. The composite materials Au/PDDA-G and PtAu/PDDA-G were evaluated by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA) for exploring the structural characterization for the electrochemical catalysis. According to TEM results, the diameter of Au and bimetallic PtAu nanoparticles is about 20-50 and 5-10 nm, respectively. X-ray diffraction (XRD) results indicate that both of PtAu and Au nanoparticles exhibit the crystalline plane of (111), (200), (210), and (311). Furthermore, XRD data also show the 2°-3° difference between pristine graphene sheets and the PDDA-modified graphene sheets. For the catalytic activity tests of Au/PDDA-G and PtAu/PDDA-G, the mixture of 0.5 M aqueous H2SO4 and 0.5 M aqueous formic acid was used as model to evaluate the electrochemical characterizations. The catalytic activities of the novel bimetallic PtAu/graphene electrocatalyst would be anticipated to be superior to the previous electrocatalyst of the cubic Pt/graphene.
authors.affiliation: Department of Physics, National Central University, Jhongli, Taoyuan, 320, Taiwan. tyyung@iner.gov.tw.|Molecular Science and Technology, Taiwan International Graduate Program/Institute of Chemistry, Academia Sinica, Taipei, 115, Taiwan. tyyung@iner.gov.tw.|Nuclear Fuels and Materials Division, Institute of Nuclear Energy Research, Lontan, Taoyuan, 325, Taiwan. tyyung@iner.gov.tw.
authors.forename: Tung-Yuan
authors.initials: TY
authors.lastname: Yung
authors.affiliation: Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan. tyliu0322@gmail.com.
authors.forename: Ting-Yu
authors.initials: TY
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, 106, Taiwan. lyhuang0123@gmail.com.
authors.forename: Li-Ying
authors.initials: LY
authors.lastname: Huang
authors.affiliation: Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan. u01187102@mail2.mcut.edu.tw.
authors.forename: Kuan-Syun
authors.initials: KS
authors.lastname: Wang
authors.affiliation: Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan. u01187135@mail2.mcut.edu.tw.
authors.forename: Huei-Ming
authors.initials: HM
authors.lastname: Tzou
authors.affiliation: Center for Condensed Matter Sciences, National Taiwan University, Taipei, 106, Taiwan. r92222019@ntu.edu.tw.
authors.forename: Po-Tuan
authors.initials: PT
authors.lastname: Chen
authors.affiliation: Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan. cychao138@ntu.edu.tw.
authors.forename: Chi-Yang
authors.initials: CY
authors.lastname: Chao
authors.affiliation: Molecular Science and Technology, Taiwan International Graduate Program/Institute of Chemistry, Academia Sinica, Taipei, 115, Taiwan. liuu@chem.sinica.edu.tw.
authors.forename: Ling-Kang
authors.initials: LK
authors.lastname: Liu
keywords: Au nanoparticle; Bimetallic PtAu nanoparticle; Formic acid oxidation; Graphene; PDDA