Preparation Of Ti₃C₂-based Energy Storage Devices And Their Application In Cathodic Protection

As an effective electrochemical anti-corrosion technology,Impressed Current Cathodic Protection?ICCP?is widely used in anticorrosion engineering.However,cathodic protection is difficult to play its role in areas where there is no mains supply current,such as islands and reefs in the open sea.Therefore,the development of cathodic protection system driven by solar energy has become an effective way to solve this problem.However,due to the alternation of day and night,solar power generation often suffer from the disadvantage of intermittent,which is difficult to maintain the continuity and stability of current supply.This is also a key obstacle for the practical application of photo-electrochemical cathodic protection technology.In order to solve this problem,electrochemical energy storing devices are introduced into the photo-electrochemical cathodic protection system to store the surplus electric charge in the working state of the solar cell.Under the condition that the solar cell cannot work normally,the energy storage device provides continuous current to the cathodic protection system.Therefore,for the first time,a cathodic protection system based on solar cell and energy storage battery was established in this work.Our research mainly focuses on the development of high-performance electrode materials.According to the material modification and three-dimensional structure design,a series of materials based on Ti₂C₃ were prepared.Ruthenium oxide,manganese dioxide,tin oxide were selected as active substances.Through the reasonable composites design,a series of high-performance energy storage device were assembled.After coupling the energy storage device into the photo-electrochemical cathodic protection system,stable sustainable electrochemical cathodic protection system were established.Specific research contents include the following contents:?1?A phosphate ion-modified RuO₂/Ti₃C₂ composite was prepared.In this composite material,Ti₃C₂ layers were introduced to prevent the RuO₂ particles from agglomeration.Thus,more active sites were exposed to the electrolyte,which improved the utilization rate of RuO₂.At the same time,the unique accordion structure of Ti₃C₂would facilitate the charge transfer and material diffusion,which improved the rate performance of the supercapacitor.When coupled into the photoelectric chemical cathodic protection system,the phosphate ion-modified RuO₂/Ti₃C₂ based supercapacitor can replace the solar cell to provide continuous and stable protection current in the dark state.?2?Ti₃C₂/CNT/MnO₂ composites were prepared by depositing nanometer manganese oxide on the surface of Ti₃C₂/CNT according to the electrostatic attraction.The introduction of nanometer MnO₂ particles could prevent the Ti₃C₂ layers form stacking and thus provide a diffusion channel for the electrolyte.At the same time,metal oxide nanoparticles can provide additional capacity and improve the electrochemical performance of supercapacitors.The introduction of carbon nanotubes act as a bridge between the different layers of Ti₃C₂,giving the composite higher conductivity.The electrochemical properties of Ti₃C₂/CNT/MnO₂ composite based supercapacitor delivered a high capacity of 126.8 F g^-1,rate performance and long cycling stability.When the supercapacitor was used as power supply in the cathodic protection system,it can provide electrons for the protected metal.?3?Ti₃C₂/CNT skeleton were prepared according to the electrostatic attraction.Then,SnO₂ was deposed on Ti₃C₂ layers by a facile hydrothermal process to get Ti₃C₂/CNT/SnO₂ composite.Electrochemical test results showed that Ti₃C₂/CNT/SnO₂delivered a high capacity of 506.9 mAh g^-1.What's more,the capacity can still maintain89.32%even after 100 cycles.When coupled the Ti₃C₂/CNT/SnO₂ based lithium ion battery into the electrochemical cathodic protection system,the battery would provide a constant and lasting current supply for the cathodic protection in the dark state,which ensures the stable operation of the cathodic protection system.