Nitrogen-Defective Polymeric Carbon Nitride Nanolayer Enabled Efficient Electrocatalytic Nitrogen Reduction with High Faradaic Efficiency

Guiming Peng, Jiawen Wu, Mingzhan Wang, Jens Niklas, Hua Zhou, Chong Liu

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Identifying highly selective catalysts and accurately measuring NH3 yield without false-positives from contaminations remain two challenges in electrochemical nitrogen reduction reaction (NRR). Here, we report N-defective carbon nitride grown on carbon paper (CN/C) as a highly selective electrocatalyst. The NH3 yield was determined reliably by the slope of mNH3-time plot rather than averaging the accumulated amount over time. Results showed the as-synthesized CN/C600 (synthesized at 600 °C) with a higher density of C=N-C N2C vacancies achieved an NH3 production of 2.9 μg mgcat. -1 h-1 at-0.3 V (versus RHE), âˆ5.7-fold higher than CN/C500. The Faradaic efficiency for CN/C600 is among the highest of 62.1%, 33.9%, and 16.8% at-0.1 V,-0.2 V, and-0.3 V, respectively. The NH3 production was verified by isotope 15N2 experiments. Further increase of N-defects on CN/C600 using plasma etching led to higher NH3 yield than comparably larger current, pointing to N-defects sites for promoting NRR.

Original languageEnglish
Pages (from-to)2879-2885
Number of pages7
JournalNano Letters
Volume20
Issue number4
DOIs
StatePublished - 8 Apr 2020
Externally publishedYes

Keywords

  • Electrochemical nitrogen reduction
  • ammonia production
  • carbon nitride
  • high Faradaic efficiency
  • nitrogen vacancy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry (all)
  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanical Engineering

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