The present work demonstrates that a single platinum atom-modified covalent triazine framework hybridized with carbon nanoparticle (Pt-CTF/CP) exhibited selective activity for the electrochemical reduction of nitrogen oxides. Pt-CTF/CP had low nitrate reduction activity, but efficiently catalyzed the reduction of nitric oxide (NO) molecules derived from the decomposition of nitrite. In contrast, a bulk Pt surface exhibited high activity for both reactions. The selectivity of Pt-CTF/CP for NO is likely due to the unique adsorption behavior of hydrogen atoms and/or nitrate ions on the single Pt atoms. (C) 2016 Elsevier B.V. All rights reserved.