▎ 摘　　要

The development of new, clean and efficient catalytic materials for hydrogen evolution reaction (HER) has become extremely unstoppable. Herein, the heterostructural Ni-Ni3P nanoparticles embedded into N\P co-doped carbon shells on 3D graphene frameworks (Ni-Ni3P@NPC/rGO) was synthesized viaan in situ phosphatization of nickel well-integrated with the structure engineering of carbon matrix derived from saccharomycetes. The in-situ phosphating process of nickel using P source provided by saccharomycetes is particularly simple, economical and environmentally friendly. In addition, the as-prepared Ni-Ni3P@NPC/rGO exhibits superior bifunctional electrocatalytic performance toward both HER (extremely low overpotential of 113 mV at 20 mA cm(-2)) and urea degradation reaction (UDR, only 1.38 V to attain 50 mA cm(-2)). Furthermore, a two-electrode electrolyzer employing the 3D block electrode (Ni-Ni3P@NPC/rGO/GFB) couple on both cathode and anode, can produce higher current density with lower voltage in urea-based wastewater splitting less than pure water splitting (saved 448 mV to deliver 500 mA g(-1)).