| 摘要： |
Existing methodological strategies for the doping of nitrogen (N) atoms in carbon materials usually contain more than one species with indefinite N content, which made it difficult to study the role of each type of N atoms played duing the doping and severely restrict the wide application. Herein, we reported a developed synthetic strategy for preparing carbonous materials contained with specific N atoms. The well-defined carbonous network triazine-graphdiyne (TA-GDY), which comprising merely one type of N atoms with fixed amount, has been prepared through bottom-up way with triethynyltriazine as the starting molecule. TA-GDY is an unique two-dimensional (2D) carbonous material, including sp- and sp(2)-hybridized carbon atoms, as well as quantitative pyridine-like sp2-hybridized N atoms. All the N atoms are placed on the plane of the carbon skeleton, and the high N content provides plenty of active heteroatom sites decorated uniformly in the hexagonal honeycomb-like pores. Based on theoretical prediction, the wide interlayer spacing and large amount of pyridinic-N as well as uniform honeycomb-like pores are favorable for Li-ion storage and diffusion. As expected, the TA-GDY-based electrodes exhibit outstanding Li-ion storage performance, such as superior rate capability, larger capacity, and excellent stability. (c) 2018 Elsevier Ltd. All rights reserved. |
