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), ∼5.7-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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.