title: Efficient Dual-Site Carbon Monoxide Electro-Catalysts via Interfacial Nano-Engineering.
abstract: Durable, highly efficient, and economic sound electrocatalysts for CO electrooxidation (COE) are the emerging key for wide variety of energy solutions, especially fuel cells and rechargeable metal-air batteries. Herein, we report the novel system of nickel-aluminum double layered hydroxide (NiAl-LDH) nanoplates on carbon nanotubes (CNTs) network. The formulation of such complexes system was to be induced through the assistance of gold nanoparticles in order to form dual-metal active sites so as to create a extended Au/NiO two phase zone. Bis (trifluoromethylsulfonyl)imide (NTf2) anion of ionic liquid electrolyte was selected to enhance the CO/O2 adsorption and to facilitate electro-catalyzed oxidation of Ni (OH)2 to NiOOH by increasing the electrophilicity of catalytic interface. The resulting neutral catalytic system exhibited ultra-high electrocatalytic activity and stability for CO electrooxidation than commercial and other reported precious metal catalysts. The turnover frequency (TOF) of the LDH-Au/CNTs COE catalyst was much higher than the previous reported other similar electrocatalysts, even close to the activity of solid-gas chemical catalysts at high temperature. Moreover, in the long-term durability testing, the negligible variation of current density remains exsisting after 1000 electrochemistry cycles.
authors.affiliation: Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125, USA.|Department of Physics &Engineering, Frostburg State University, Frostburg, MD 21532-2303, USA.|Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125, USA.
authors.forename: Zhongyuan
authors.initials: Z
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Feifei
authors.initials: F
authors.lastname: Cheng
authors.affiliation: Integrated Composites Laboratory (ICL), Department of Chemical &Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA.
authors.forename: Zhanhu
authors.initials: Z
authors.lastname: Guo
authors.affiliation: Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125, USA.
authors.forename: Guangdi
authors.initials: G
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Xu
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125, USA.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry*; D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D055664:Electrochemical Techniques; D006878:Hydroxides / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*
chemical_list: D006878:Hydroxides; D037742:Nanotubes, Carbon; C037473:nickel hydroxide; D009532:Nickel; D002248:Carbon Monoxide; D000535:Aluminum