Controllable Preparation Of Nanostructured Ni-P Alloys And Their Electrochemical Performance

Ni-P alloys have received much attention due to their crystal structures which depend on the content of P and high performance catalytic, magnetic and corrosion resistant. Ni-P alloys have wide applications in chemical power and electrocatalysis. As they have been widely used as anode catalysts for methanol electro-oxidation and also exhibit very excellent lithium storage performance, we propose to investigate the controllable synthesis of Ni-P alloys in an environmental-friendly way. Moreover, in this work we develop the electrochemical performance of Ni-P alloys through surface modification with cabon and combination with graphene. Depending on the template effect of the ChCl (choline chloride)/EG (ethylene glycol) based eutectic mixture, we propose a facile ionothermal protocol to synthesize core-shell structrured Ni-P alloy nanoparticles. Ni-P alloy nanoparticles with different shell thicknesses can be obtained by controlling the Ni2+/H2PO2-mole ratio in the reaction solvents. As anodes for lithium ion batteries, their performances of lithium storage rely on the shell thickness and the size of the core-shell Ni-P nanaoparticles. Amorphous Ni-P-C films are fabricated by combining the electrodeposition of Ni-P films from a eutectic-based ionic liquid and the direct current magnetron sputtering of amorphous carbon top-layer. The thickness of the carbon top-layer is about10nm. The composite structure shows more excellent rate performance and developed cycling stability than the sample without carbon layer. Anchoring three-dimensional network structured Ni-P nanowires on reduced graphene oxide (RGO) is prepared via a one-pot solvothermal method. Both the reduction of graphene oxide (GO) and deposition of Ni-P nanowires are achieved by introducing NaH2PO2·H2O in the reaction medium. As the catalytic electrodes in1M KOH with addition of0.5M methanol, the catalytic activity of Ni-P/RGO is much better than that of Ni-P nanowires.