▎ 摘　　要

The Summary of main observation and conclusion Heteroatom-doped carbon materials have been widely used in energy storage and conversion such as supercapacitors and electrocatalysts. In this work, L-asparagine (Asn), an amino acid derivative, has been used as a doping agent to prepare nitrogen-doped reduced graphene oxide gels (N-GAs). The 3D interconnected structure gives rise to the superior electrochemical properties for supercapacitor and electrocatalytic oxygen reduction reaction (ORR). The N-GA-4 (the mass ratio of Asn to graphene oxide (GO) is 4:1 by hydrothermal method) electrode shows the capacitance of 291.6 F.g(-1) at 0.5 A.g(-1). Meanwhile, the assembled symmetric supercapacitor achieves a maximum energy density of 23.8 Wh.kg(-1) when the power density is 451.2 W.kg(-1), and demonstrates an ultralong cycling life that the retention of capacitance is 99.3% after 80 000 cycles. What's more, the annealed aerogel N-GA-4-900 exhibits an onset potential (E-onset) of 0.95 V, half wave potential (E-1/(2)) of 0.84 V (vs. RHE) and the oxygen reduction current density of 5.5 mA.cm(-2) at 0.1 V with nearly four-electron transfer, which are superior to commercial Pt/C. This work offers a new insight into the synthesis and applications of N-GAs materials towards high performance in supercapacitors and ORR.