▎ 摘　　要

Efficient and robust electrocatalysts for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play key roles in energy conversion and storage devices. In this work, we construct a bifunctional catalyst by homogeneously dispersing Co9S8 nanoparticles on a nitrogen (N), sulfur (S), and phosphate (P) ternary-doped 3D graphene aerogel (NSPG) matrix via a facile pyrolysis method. Because of the N, S, and P ternary-doping effects, abundant defects and channels are produced in the edge of graphene, resulting in a high specific BET surface area (S-BET) of 657 m(2) g(-1). With the incorporation of Co9S8 nanocrystals into NSPG, the produced catalyst (Co9S8/NSPG-900) possesses an S-BET of 478 m(2) g(-1) with porous characteristics. The synergy of structure and composition features enables fast electrochemical kinetics of the catalyst, leading to efficient ORR activity with a half-wave potential of 0.800 V versus the reversible hydrogen electrode (RHE), a limiting current density of 7.26 mA cm(-2), high stability and CH3OH tolerance, a high OER performance with an overpotential of 343 mV at the current density of 10 mA cm(-2), and excellent long-term stability. As a bifunctional catalyst for both the ORR and OER, it delivers a potential gap of 820 mV, comparable to state-of-the-art bifunctional catalysts.