Controllable nitrogen-doping of nanoporous carbons enabled by coordination frameworks
文献情報
Wei Zhang, Saiyu Bu, Qinghong Yuan, Ming Hu
Doping nitrogen into nanoporous carbons is of great significance in various applications. However, in situ synthesis of N-doped nanoporous carbons with controllable/predictable N configurations remains a challenge. On the basis of first-principles calculations, we developed a temperature-control strategy to tailor the N configurations in nanoporous carbons based on the different thermal stabilities of the N dopants. By annealing the coordinated 2-methylimidazole molecules in a range of temperatures, the content of the N dopants in the obtained nanoporous carbons can be controlled, eventually leading to a maximized percentage of pyridinic-N. The K-ion storage capacity of the N-doped nanoporous carbons showed a strong correlation with the N configurations according to a carbon/K half-cell test. The nanoporous carbon with the maximum percentage of pyridinic-N showed a remarkable rate performance and cycling stability, matching with the prediction of the first-principles calculations.
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