A Nitrogen-Doped Carbon Catalyst for Electrochemical CO2 Conversion to CO with High Selectivity and Current Density

作者：Jhong Huei Ru Molly; Tornow Claire E; Smid Bretislav; Gewirth Andrew A; Lyth Stephen M^*; Kenis Paul J A^*

来源：Chemsuschem, 2017, 10(6): 1094-1099.

DOI：10.1002/cssc.201600843

• catalysis
• carbon nanotubes
• carbon nitride
• co2 conversion
• metal-free

We report characterization of a non-precious metal-free catalyst for the electrochemical reduction of CO2 to CO; namely, a pyrolyzed carbon nitride and multiwall carbon nanotube composite. This catalyst exhibits a high selectivity for production of CO over H-2 (approximately 98% CO and 2% H-2), 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 x higher than state-of-the-art Ag nano-particle-based catalysts, and the maximum current density is 90 mAcm(-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 CO2 reduction as an approach to reduce atmospheric CO2 emissions or as a method for load-leveling in relation to the use of intermittent renewable energy sources.

• 出版日期2017-3-22