Preparation Of Nickel–Based Transition Metallic Hybrid Materials And Their Applications In Water Splitting

Energy storage and conversion technologies are key barriers in the development of sustainable energy for the future.In extent mainstream devices,the designing of electrocatalysts is vital for enlarging the storage and transfer current densities.Water splitting contains significant electro reactions,including hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).Meanwhile,it is also an effective method to produce hydrogen,which is a promising future energy carrier.As a result,the water splitting receives widespread attention in the research fields.This paper is on the basic of nickel-based materials and explores their applications in electrocatalysis from two perspectives.In the first work of this paper,3D self-supported Ni(PO₃)₂–MoO₃/NF nanorods have been synthesized through a two-step method.The as-prepared sample exhibits excellent catalytic activities in alkaline solution for both HER and OER.When employed as electrode materials,Ni(PO₃)₂–MoO₃ achieves a current density of 10 mA cm^-2 at overpotentials of 86,234 and 200mV for HER,OER and water splitting,respectively.The heterologous derivatives of different metals are successfully incorporated to perform with outstanding properties as a bifunctional catalyst.The work highlights the promising application of Ni(PO₃)₂–MoO₃/NF as an appealing candidate for bifunctional full water splitting electrocatalysts.In the second part,a high–loading alloy–type single atom Pt SAs–Ni/NC has been synthesized via a coprecipitation strategy.Remarkably,the nanowire is constructed by nitrogen doped carbon skeleton with scattered Ni nanoparticles.Pt single atoms distributed on the surface and inside the nanoparticles,forming Pt-Ni coordinate active sites.The loading content of single atom is as high as 4.94 wt%.The obtained Pt SAs–Ni/NC electrocatalyst performs superior HER properties.DFT calculations reveal the near zero?G_H*of Pt SAs–Ni structure and confirms the active site catalyzing HER.These two works provide new thoughts and references for the development of nickel-based catalysts and water splitting.