Preparation of self-supported NiSe/CoCr-LDH bifunctional electrocatalysts for splitting seawater
NiSe has become the preferred material for most electrocatalytic water decomposition researchers due to its excellent electrocatalytic properties,such as high conductivity,rich crystalline and electronic structures,and diverse and convenient synthesis methods.In the process of exploring electrocatalytic activi-ty,NiSe inevitably have problems such as low activity and poor stability,which means that on the one hand,it is necessary to provide additional higher energy to achieve water decomposition,greatly influ-ence the efficiency of electrocatalytic water decomposition;On the other hand,poor stability is difficult to apply to electrocatalytic electrolysis of seawater,and cannot solve the key problem of achieving energy con-version in the future.In order to improve the stability and electrocatalytic activity of NiSe and achieve effi-cient long-term electrolysis of seawater,the CoCr-LDH was electrodeposited onto the surface of NiSe to protect it while forming a heterogeneous structure,significantly reducing the energy required for electrocat-alytic hydrogen and oxygen evolution.The prepared NiSe and CoCr-LDH heterostructures grown on foam nickel(denoted as NiSe/CoCr LDH/NF)are used to the splitting water system in simulated alkaline seawa-ter environment.Only requiring a low overpotential of 1.59 V to reach 40 mA·cm-2,and they can work stably for 16 h without chlorine gas production,realizing green and efficient electrolysis of seawater.It pro-vides a new idea for the preparation of highly efficient and stable electrocatalysts.
transition metal chalcogenideslayered double hydroxidebifunctionalelectrocatalytic water decompositionalkaline simulated seawater
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