Construction of Pt-Ni nanocomposites from Pt-Ni multinuclear complexes on gold(111) surface and their electrocatalytic activity for methanol oxidation
Novel electrocatalysts for methanol oxidation were prepared from two Pt-Ni multinuclear complexes,Pt2Ni(NH2CH2CH2S)24Cl4 and Pt(bpy)Ni(NH2CH2CH2S)2(bpy)(NO3)2 (bpy= 2,2′-bipyridine).They were adsorbed on a Au(111) surface by immersing the Au(111) electrode in solutions containing these complexes.The modified Au(111) electrodes were then subjected to potential cycling or heat-treatment at 200 ℃ and 300 ℃ so that organic ligands were decomposed and adsorbed complexes were converted to nanocomposites.For a comparison,Au(111) electrode modified by a Pt based nanocomposite prepared by using a di-platinum(Ⅱ) complex (Pt2(terpy)2(μ-otdst)2+ (terpy = 2.2′:6′,2″-terpyridine,H2otdst = 2-octylthio-4,6-disulfanyl-1,3,5- triazine)) as a starting molecule.The surface species were characterized by X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM) in addition to cyclic voltammetry (CV).Two-dimensional nanocomposites of monatomic height were observed by STM.The coverages of the nanocomposites were 2-8%.By repeating the complex adsorption and heat-treatment for five times,nanocomposites of higher coverage of 13-19% with monatomic height were formed on Au(111) surface.The resultant nanocomposites showed high activity for methanol oxidation reaction (MOR)with an improved CO-tolerance in a 0.1 M KOH aqueous solution containing 1 M CH3OH.
Methanol oxidation Electrocatalysis Pt-Ni Fuel cell
Hua-Xin Zhang Yukihisa Okawa Masako Kato Yoichi Sasaki Kohei Uosaki
Center for Strategic Utilization of Elements,Faculty of Science,Hokkaido University,Sapporo 060-0810 International Center for Materials Nanoarchitectonics(MANA),National Institute for Materials Science Center for Strategic Utilization of Elements,Faculty of Science,Hokkaido University,Sapporo 060-0810 Center for Strategic Utilization of Elements,Faculty of Science,Hokkaido University,Sapporo 060-0810 Center for Strategic Utilization of Elements,Faculty of Science,Hokkaido University,Sapporo 060-0810
国际会议
南京
英文
41-47
2016-12-23（万方平台首次上网日期，不代表论文的发表时间）