Subtly synthesized graphdiyne nano-lamellas as stable electrode material for supercapacitors.

• Graphdiyne (GDY) lamelliform was successfully prepared by cross-coupling strategy under the catalysis of cuprous iodide. • The GDY has large specific surface area (SBET is 553 m2 g − 1) and suitable pore size structure. • The GDY exhibits high energy storage capacity with energy density of 6.11 wh kg−1 under 5500w kg−1. • The GDY exhibits long cycle persistence of no attenuation for 11,000 cycles in three-electrode system. Porous carbon is an ingredient for energy transformation and collection systems in terms of electrochemistry. As a new member, graphdiyne (GDY) gradually began to be concerned because of its especially compositional and structural properties. Herein, a lamelliform GDY was successfully prepared by cross-coupling strategy under the catalysis of cuprous iodide. Thanks to the sp and sp2 hybrid carbon networks, the obtained GDY nano-lamellas promote excellent performance in the electrode of supercapacitors with a gravimetric capacitance of 137.8 F g − 1 at a mass-specific current of 1 A g − 1, and a relatively good rate performance of 81.28% when the mass-specific current reach to 20 A g − 1. In addition, the capacitance of the GDY electrode barely decays during the 11,000 cycles of repeated testing. This enables the assembled symmetric supercapacitor provides a acceptable energy density of 6.11Wh kg−1 under a power density of 5500W kg−1, and with an average decay of 0.5% per cycle at the end of 5000 cycles. The relatively good electrochemical stability of this GDY nano-lamellas material will open the further promotion of graphdiyne-based electrodes in the domain of supercapacitors. [Display omitted] [ABSTRACT FROM AUTHOR]