| The intensification of the modern energy crisis has prompted researchers to urgently seek alternative energy sources that can be replaced.The decomposition of electrocatalytic water into hydrogen and oxygen is widely recognized as one of the most promising ways to obtain this new energy.Oxygen evolution(OER)and hydrogen evolution(HER)are especially important for clean and renewable hydrogen energy technologies.Since OER and HER usually require very high overpotentials for water splitting,the loss of large amounts of energy severely hampers the large-scale production of hydrogen and oxygen.Electrospinning represents a simple,low cost,clean,non-polluting and efficient synthesis technique.It plays a very important role in the construction of nanomaterials,and has the advantages of simple equipment,low cost,strong operability and high efficiency.The fiber web prepared by the method has the advantages of excellent quality,high surface area and good toughness.In recent years,the application of electrospinning in the field of electrochemistry has become a research hotspot.This paper provides a simple and effective method for preparing an amorphous hydroxide electrolyzed water catalyst on a foamed nickel substrate by electrospinning.The catalyst has excellent catalytic performance in an alkaline electrolyte without any other treatment.The composition and structure of the catalyst were characterized and the electrocatalytic activity and stability of the catalyst were evaluated.The synthesis method of the catalyst,the synergistic effect of metal(Co/Mn)(Co/Fe)and the amorphous structure were evaluated.The effect of catalyst catalytic activity.The main research contents are as follows:(1)A uniform stable electrospinning precursor solution is formed by using the polymer PVP as a solution of manganese acetate,cobalt nitrate hexahydrate,DMF,and 10%PVP solution.A uniformly stable catalyst is obtained in one step by an electrospinning method.The obtained amorphous NF-PVP/Mn4Co nanofibers have a porous fiber structure and are uniformly spread on the foamed nickel in a sheet form.This multi-layer,porous nanofiber structure enhances the specific surface area of the catalyst.The invention provides a rich active site,which can better promote the escape of the catalytic reaction gas,thereby increasing the exchange rate of the electrolyte on the catalyst,thereby improving the catalytic performance of the catalyst.It has significant catalytic activity and stability for HER with a low overpotential of 0.1 V at 10 mA cm-2 and a low Tafel slope of 65.4 mV dec-1.(2)A uniform stable electrospinning precursor solution was formed by using the polymer PVP as a solution of ferric nitrate,cobalt nitrate,DMF,and 10%PVP.A uniformly stable catalyst is obtained in one step by an electrospinning method.The entire surface of the foamed Ni is completely covered by amorphous PVP-Co/Fe1.3 micro-nanofibers.It has a smooth surface and a 3 D porous network structure,which increases the specific surface area of the catalyst and provides a rich active site.It is good to promote the evolution of the catalytic reaction to generate gas,thereby improving the catalytic performance of the catalyst.The obtained amorphous PVP-Co/Fe1.3 micro/nano fiber has a catalytic effect superior to that of the noble metal RuO2 catalyst,with a low overpotential of 0.267 V at 100 mA cm-2 and a low Tafel slope of 47.43 mV.Dec-1;simultaneously,the NF-PVP/CoFe1.3 catalyst was placed as a cathode and an anode in a total hydrolysis reaction apparatus for electrolyzing water,and only a voltage of 1.70 V was required to achieve a total hydrolysis current density of 10 mA/cm2.It is proved that the electrospinning method is convenient and effective for preparing high-performance electrocatalyst,and it also provides the possibility for large-scale production of environmentally friendly electrocatalyst. |
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