▎ 摘　　要

Background: Novel electrocatalysts with high-performance, low-cost, stability, and multifunctional features have been always of interest, for they can boost water splitting efficiency. Results: Herein, we have first exploited melamine-derived carbon foam-supported graphene-CoNi nanocomposites, labeled as CoNi-NG/MF. Scanning and transmission electron microscopy images demonstrate that CoNi particles are attached to the surfaces of nitrogen-doped graphene, and graphene nanosheets either encase the backbones or insert in the cavities of foams. Investigation of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) indicates that CoNi-NG/MF can afford optimal overpotentials of 246 and 350 mV at a current density of 10 mA cm(-2), and their Tafel slopes are 123 and 59 mV dec(-1), respectively. Therefore, CoNi-NG/MF can serve as promising bifunctional electrocatalysts for HER and OER. Conclusions: In addition, the influence of each component on the HER and OER electrocatalytic performances for CoNi-NG/MF has been revealed. The synergetic effect between well-dispersed CoNi particles and nitrogen-doped graphene nanosheets can create more active sites and improve electrocatalytic activity. Meanwhile, three-dimensional carbon frameworks inset with plentiful graphene can construct interconnected conductive networks and hierarchical porous structures, promoting electron-transfer kinetics and enhancing mass-transfer efficiency.(c) 2022 Society of Chemical Industry (SCI).