Controllable Synthesis Of Pt-Fe Bimetallic Nano- Particles Modified Nickel Foam Electrode And Research Hydrogen Evolution Performance

Energy crisis and environmental problems are two crucial factors that affect the sustainable development of human economy and society.Growing energy demand,coupled with their inevitable depletion has raised increasing concerns about energy crisis and environmental problems,which has motivated the search for renewable and clean energy alternatives.Hydrogen energy is viewed as an ideal energy carrier because of its environmental friendliness,high efficiency,and renewability.Water electrolysis technology is an important method for highly pure hydrogen production.In order to decrease the energy consumption of water electrolysis,it’s of momentous significance to research the hydrogen evolution of materials which have high catalytic activity,lower overpotential and excellent stability.At present,nickel foam（NF）industry is gradually developing toward industrialization and scale,and it can provide the enough and cheap of supporting material.Moreover,platinum（Pt）electrode is the most efficiently performance catalyst for hydrogen evolution reaction（HER）.In this report,the Pt-Fe/NF electrode was obtained using the electrodeposition technique and impregnation deposition method with commercial NF as the support.We carefully investigated the influence of the electrodeposition current density,the electrodeposition time,Pt loading,the impregnation deposition temperature and the time on the catalytic of Pt-Fe/NF electrode,and fixed the optimal technics parameters of the electrode.And further discuss the electrochemical properties of the as-prepared electrodes in 0.05 mol·L^-1 H2SO4,0.05 mol·L^-1 phosphate buffer（PBS）and 0.05 mol·L^-1 KOH solution.In the end,analysised the HER mechanism of Pt-Fe/NF electrodes in 0.05 mol·L^-1 KOH solution.The conclusions as follows:（1）Preparation conditions of electrodeposition and impregnation deposition,and the fixed parameters have a great influence to Pt-Fe/NF electrode on the surface morphology,composition and analytical electrocatalytic hydrogen evolution properties.The experimental results show that the best preparation process conditions of Pt-Fe/NF electrode is:the electrodeposition current density of 10 mA,the electrodeposition time of 30 min,the theoretical Pt loading of 0.1951 mg·cm-2,the impregnation temperature of 30 ℃ and time 4 h,FeSO4·7H2O 0.015 mol·L^-1,Na2S04 0.010 mol·L^-1,CTAB 0.001 mol·L^-1 and the solution was stired with 120 r·min-1.（2）The Pt-Fe/NF electrode was prepared under the optimum process parameters,the morphologies and compositions of the as-prepared electrodes were characterized by field-emission scanning electron microscope（FE-SEM）,energy-dispersive X-ray spectroscopy（EDS）,X-ray diffraction（XRD）,X-ray photoelectron spectroscopic（XPS）and Inductively coupled plasma-atomic emission spectroscopy（ICP-AES）.Characterization results that the successfully loading of Fe and Pt on NF through the present process and these zero valence metal.Furthermore,experimental Pt loading on the Pt/Fe-NF is 0.1500 mg·cm-2.（3）Discussing the electrochemical properties of the as-prepared electrodes in 0.05 mol·L^-1 H2SO4,0.05 mol·L^-1 PBS and 0.05 mol-L^-1 KOH solution through linear sweep voltammetry（LSV）,electrochemical impedance spectroscopy（EIS）,and stability test.The results show that the Pt-Fe/NF electrode has the highest catalytic activity in the three solutions.According to the stability test of the electrode,the Pt-Fe/NF electrode has the best stability in the alkaline electrolyte.（4）The Pt-Fe/NF electrode exhibited higher electrocatalytic activity than those of Pt/NF and NF electrodes.This was likely due to,（a）the addition of Fe is beneficial to the Pt loading on NF electrode;（b）the magnified morphology of Fe and Pt particles,cluster-like morphology could be observed,and these zero valence metal;（c）the formation of the alloy of Fe and Ni,which played the role of the synergetic effect for HER.（5）Analysised the HER mechanism of Pt-Fe/NF electrodes in 0.05 mol·L^-1 KOH solution through EIS,electrochemical active surface area（ECSA）,and Tafel slope.The results are as follows:Tafel slope of Pt-Fe/NF was 59.9 mV dec-1,indicating that the Volmer-Heyrovsky HER mechanism was the rate-limiting step;The Pt-Fe/NF electrode has the smallest Tafel slope is59.9 mV dec-1,the biggest exchange current density is 8.538×10-3 mA cm-2,the highest capacitance is 69.10 mF cm-2 and the minimum charge transfer resistance（Rct）is 3.224 Ω,suggesting outstanding hydrogen evolution performance for the Pt-Fe/NF.