Synthesis And Performance Of Oxygen Evolution Reaction (OER) Electrocatalysts Applied For High Current Density Seawater Splitting

The environmental pollution brought by the consumption of fossil energy have made more attention to the development of clean energy.Hydrogen via Water electrolysis is considered as an ideal alternative to fossil fuels.Seawater,a renewable energy,which is an ideal resources to electrolyze water.On the other hand,water-splitting efficiency is largely limited by the high kinetic overpotential of the anodic oxygen evolution reaction,which means developing catalysts applies to high current density is the key to the industrialization of hydrogen production and promote the large-scale use of hydrogen energy.In order to achieve the low-price,high-performance seawater electrolysis catalyst,this paper modified two kinds of catalysts by（1）synthesizing metal layered double hydroxides,（2）modifying metal sulfides by doped atoms to improve the OER performance.Based on,an in-situ growth NiFe Mix-meatal hydroxides（MNF）and a Fe-Ni₂S₃@NF catalytic electrode were constructed,which results of the study are as follows:（1）A kind of NiFe Mix-meatal hydroxides（MNF）which synthesized by a short,in-system way which needs direct current even solar power only.Based on the interaction between Fe-Ni,the electrode shows excellent electrocatalytic activity for OER,especially at high current density,only needs 363mV overpotential to achieve the current density of500mA cm^-2.In addition,the electrode has satisfactory long-term high current stability,which can maintain a high current density for 24h without significant current attenuation.Besides,MNF also has good seawater electrolytic applicability,performances high current density in alkaline seawater systems only requires an overpotential of 390mV,and also shows satisfactory stability in seawater.（2）A Fe-Ni₂S₃@NF catalytic electrode is synthesized in this chapter by using Fe atom modify metal sulfide,Benefit from the interaction between S,Ni,Fe,the catalytic activity and stability of Fe-Ni₂S₃@NF has been greatly improved,so that it exhibits a low overpotential（330mV）at an ultra-high current density of 500mA cm^-2,as well as maintain continuous operation for 40h at the same current density.In this paper,a simple and environmentally friendly synthesis method for OER catalytic electrode was proposed,which successfully prepared high active electrolyzed OER catalytic electrode by a variety of modifications.