Electrocatalytic Reduction of Nitrate to Nitrous Oxide by a Copper-Modified Covalent Triazine Framework

Tatsuro Yoshioka, Kazuyuki Iwase, Shuji Nakanishi, Kazuhito Hashimoto, Kazuhide Kamiya

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

It was found that copper-modified covalent triazine frameworks (Cu-CTF) efficiently catalyze the electrochemical reduction of nitrate and promote N-N bond formation of nitrous oxide (N2O), a key intermediate for N2 formation (denitrification). A Cu-CTF electrode exhibited an onset potential of -50 mV versus RHE for the electrochemical nitrate reduction reaction (NRR). The faradaic efficiency for N2O formation by Cu-CTF reached 18% at -200 mV versus RHE, whereas that for Cu metal was negligible. On the basis of density functional calculations for Cu-CTF, both solvated and surface-bound nitric oxide (NO) were generated by the NRR due to the moderate adsorption strength of Cu atoms for NO, a property that facilitated the effective dimerization of NO through an Eley-Rideal-type mechanism.

Original languageEnglish
Pages (from-to)15729-15734
Number of pages6
JournalJournal of Physical Chemistry C
Volume120
Issue number29
DOIs
Publication statusPublished - 2016 Jul 28
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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