Construct A Multi-dimensional Transition Metal Compound Interface Synergistic Effect

Reasonable design of energy storage materials with high activity and stability is an important means to solve the energy crisis.Transition metal compounds are considered to be ideal materials in the field of energy storage due to their low price and green pollution-free.However,its single dimension and composition often cannot meet the requirements for high energy storage activity and long-lasting stability of supercapacitor electrode materials.The construction of multi-dimensional and multi-component transition metal compounds can not only make full use of the advantages of a single component,but also can effectively use its spatial dimension to enhance its electron and electrolyte transport.Therefore,the composite material with multiple components and multiple components is prepared,and using the synergistic effect of the electronic structure and the spatial structure.It provides more possibilities for improving the performance of electrochemical energy storage.Moreover,the in-depth study of the interfacial synergy effect of multi-dimensional and multi-component composites can promote the purposeful design of high-performance energy storage composites.In this article,we are guided by the interface synergy effect and based on the design idea of multi-dimensional and multi-component nanostructures to prepare highly active and stable mulberry-shaped Co O@Ni₃S₂ and ball flower-shaped Ni₃S₂@Ni Co₂O₄ composite materials.Using it as a model,the coordination effect and the mechanism of electron transmission in the composite system were studied,and they were assembled into high-performance supercapacitors.The specific research is as follows:（1）Under the guidance of the multi-component and multi-component electronic structure,one-dimensional Co O is used as the substrate to design and prepare mulberry-shaped Co O@Ni₃S₂ electrodes.The one-dimensional Co O nanorod can shorten the electron transmission distance and enhance the conductivity of the material,and it can adjust the electronic structure of the Co O through interface interaction,thereby generating more active sites.And can effectively improve the electrochemical stability of the composite material through the interface synergistic effect.Experimentally,in the three-electrode system test,the specific capacity of Co O@Ni₃S₂ is as high as 2325F g^-1 at 1 A g^-1.Mulberry leaf-shaped Co O@Ni₃S₂ exhibited a capacitance retention rate of 63%at 10 A g^-1.After 1000 cycles of stability testing,the capacitance retention rate of Co O@Ni₃S₂ is 88%at 1 A g^-1.It shows that the use of Co O as the substrate and the growth of Ni₃S₂ on it can give full play to the advantages of the two materials,so that under the influence of the synergistic effect,the electrochemical performance and stability are increased.（2）Under the guidance of the synergistic effect of the spatial structure,construct a bulbous Ni₃S₂@Ni Co₂O₄ electrode.In the study of electrochemical storage,a larger spatial structure is conducive to the transport of electrolyte ions and the improvement of electrochemical storage capacity.Therefore,this experiment effectively expands the spatial structure of the two materials through the use of interface synergy and the different dimensions and components of the two materials.We choose Ni₃S₂@Ni Co₂O₄as the research model and use it as the electrode material for supercapacitors.In terms of physical characterization,the introduction of Ni Co₂O₄ made the original pleated Ni₃S₂ ball changed into a petal-shaped Ni₃S₂@Ni Co₂O₄ ball flower structure,and the spatial structure was further released,thereby promoting its electrochemical performance.In the three-electrode system,the specific capacity of Ni₃S₂@Ni Co₂O₄can reach 1150 F g^-1 at 1 A g^-1.After 1000 cycles of stability testing,the capacitance retention rate of Ni₃S₂@Ni Co₂O₄ is 63%at 1 A g^-1,and the capacitance retention rate of Co O@Ni₃S₂ when the current density is 56%from 1 A g^-1 to 10 A g^-1.The experimental results show that a new spatial structure layout can be effectively constructed through the interface effect,thereby exerting the synergistic effect of the spatial structure and showing more excellent electrochemical performance.