Journal
NANOSCALE
Volume 11, Issue 11, Pages 4911-4917Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr10236h
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Funding
- National Natural Science Foundation of China [11422215, 11672079, 21890381, 21721002, 21475029]
- Chinese Academy of Sciences
- National Key Basic Research Program of China [2014CB931801, 2016YFA0200700]
- Frontier Science Key Project of Chinese Academy of Sciences [QYZDJ-SSW-SLH038]
- K. C. Wong Education Foundation
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Nitrogen-doped carbon materials are promising electrocatalysts for electroreduction of CO2. However, the low current density and moderate faradaic efficiency of these materials limit their practical application. Here, we report the MOF-derived nitrogen-doped nanoporous carbon (NC) as a highly efficient and stable electrocatalyst for the conversion of CO2 to CO. The NC catalysts were prepared by calcining ZIF-8 at different temperatures in argon (Ar). The catalytic performances show that the higher pyrolysis temperature result in a better CO2 electroreduction activity of the catalysts. The NC catalyst with the best performance achieves high selectivity with 95.4% CO faradaic efficiency (FE) at -0.5 V vs. reversible hydrogen electrode (RHE). The catalyst also maintains long-term stability of 20 h operation, after which the FE of CO is still greater than 90%. The experiments show that higher pyrolysis temperature reduces the total nitrogen (N) but changes the nature and density of N defects. Density functional theory calculations reveal that higher pyrolysis temperature leads to enhanced activity by promoting the formation of low multiple pyridinic N, which provides more efficient active sites.
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