Triazine-graphdiyne: A new nitrogen-carbonous material and its application as an advanced rechargeable battery anode

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 sp²-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.