title: A Nitrogen-Doped Carbon Catalyst for Electrochemical CO2Conversion to CO with High Selectivity and Current Density.
abstract: We report characterization of a non-precious metal-free catalyst for the electrochemical reduction of CO2to CO; namely, a pyrolyzed carbon nitride and multiwall carbon nanotube composite. This catalyst exhibits a high selectivity for production of CO over H2(approximately 98 % CO and 2 % H2), as well as high activity in an electrochemical flow cell. The CO partial current density at intermediate cathode potentials (V=-1.46 V vs. Ag/AgCl) is up to 3.5× higher than state-of-the-art Ag nanoparticle-based catalysts, and the maximum current density is 90 mA cm-2. The mass activity and energy efficiency (up to 48 %) were also higher than the Ag nanoparticle reference. Moving away from precious metal catalysts without sacrificing activity or selectivity may significantly enhance the prospects of electrochemical CO2reduction as an approach to reduce atmospheric CO2emissions or as a method for load-leveling in relation to the use of intermittent renewable energy sources.
authors: Department of Chemistry and Chemical & Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA.
authors: Huei-Ru Molly
authors: HM
authors: Jhong
authors: Department of Chemistry and Chemical & Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA.
authors: Claire E
authors: CE
authors: Tornow
authors: International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Nishi-ku, 819-0395, Fukuoka, Japan.
authors: Bretislav
authors: B
authors: Smid
authors: Department of Chemistry and Chemical & Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA.|International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Nishi-ku, 819-0395, Fukuoka, Japan.
authors: Andrew A
authors: AA
authors: Gewirth
authors: International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Nishi-ku, 819-0395, Fukuoka, Japan.|Energy 2050, Department of Mechanical Engineering, University of Sheffield, S10 2TN, UK.
authors: Stephen M
authors: 0000-0001-9563-867X
authors: SM
authors: Lyth
authors: Department of Chemistry and Chemical & Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL, 61801, USA.|International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, Nishi-ku, 819-0395, Fukuoka, Japan.
authors: Paul J A
authors: PJ
authors: Kenis
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D004553:Electric Conductivity; D004563:Electrochemistry; D004566:Electrodes; D008958:Models, Molecular; D008968:Molecular Conformation; D053761:Nanocomposites / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009570:Nitriles / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D037742:Nanotubes, Carbon; D009570:Nitriles; D002245:Carbon Dioxide; C011206:cyanogen; D002244:Carbon; D002248:Carbon Monoxide; D009584:Nitrogen
keywords: carbon nanotubes; carbon nitride; catalysis; co2 conversion; metal-free