Ni-Ni3P Nanoparticles Embedded into N, P-doped Carbon on 3D Graphene Frameworks via In Situ Phosphatization of Saccharomycetes with Multifunctional Electrodes for Electrocatalytic Hydrogen Production and Anodic Degradation

Abstract 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 via an 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 low voltage in urea-based wastewater splitting less than pure water splitting (saved 448 mV to deliver 500 mA g–1).