Efficient Dual-Site Carbon Monoxide Electro-Catalysts via Interfacial Nano-Engineering

Sci Rep. 2016 Sep 21:6:33127. doi: 10.1038/srep33127.

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.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Aluminum / chemistry*
  • Carbon Monoxide / chemistry*
  • Catalysis
  • Electrochemical Techniques
  • Hydroxides / chemistry*
  • Nanotubes, Carbon / chemistry
  • Nickel / chemistry*

Substances

  • Hydroxides
  • Nanotubes, Carbon
  • nickel hydroxide
  • Nickel
  • Carbon Monoxide
  • Aluminum