石墨涂层改性锌负极及其在锌离子混合超级电容器中的应用

Graphite-layer modified zinc anode and its application in zinc-ion batteries

该文将石墨涂覆于锌片上,运用恒电流充放电、循环伏安(CV)以及电化学阻抗谱(EIS)等表征方法,研究了涂层对锌电极的改善效果。研究结果显示,经过石墨修饰的锌电极的循环伏安扫描曲线具有良好的矩形特性,石墨/锌复合电极全电池的比容量为102.8 mAh/g,经过173次循环后,比容量保留率为97.66%。该综合实验操作工艺稳定,实验结果具有良好的再现性,涵盖的知识点丰富,能够使学生在了解储能器件技术发展趋势的基础上培养科研创新能力和综合实践能力。

[Objective]The“Made in China 2025”initiative intends to transform China from a manufacturing giant into an innovation-driven,quality-over-quantity world manufacturing power.Actively meeting industry development needs and training application-oriented talents with a solid professional foundation and rich innovation and creativity is particularly important for local colleges and universities.As an undergraduate majoring in chemistry and applied chemistry,how to integrate and apply the knowledge of the four major chemistry subjects comprehensively to combine the knowledge learned with the industry organically is one of the most crucial approaches to fostering students’innovation and creativity.New technologies,new achievements,and cross-cutting technologies are introduced into the teaching content to help students understand the development prospects of the industry,learn the basic process of scientific research work,and enhance their ability to consult and summarize the literature,analyze and solve problems,examine data,and write scientific papers.More importantly,they can cultivate students’ability to use knowledge,analyze and solve problems comprehensively,and think innovatively.[Methods]Water-based metal ion batteries have elicited much interest due to their excellent safety,low production cost,easy processing,high ionic conductivity,and environmental protection;they are considered one of the candidates for large-scale energy storage devices with substantial application prospects.Compared with other metals,zinc metal has a higher REDOX potential and can be directly used as a negative electrode material for water batteries.The entire preparation,modification,and electrochemical characterization of zinc-ion battery electrode materials,encapsulation of button batteries,and testing of battery electrical performance are integrated into teaching experiments for the comprehensive practical training of students.The teaching adopts“guided”teaching,allowing students to design experimental procedures independently,formulate experimental plans,and collect experimental data by referring to literature.Teachers and students correct errors in the experiment through discussion,ensuring the scientific nature of the experiment and the rationality of the data.They stimulate students’desire to explore,critical thinking,and ability to solve practical problems by discussing uncertain factors in the experiment and“open conclusions”in scientific research.[Results&Conclusions]The experiment greatly stimulates students’enthusiasm for exploration.The comprehensive experiment has no fixed“conclusion,”and the experiment has numerous uncertain factors.Students actively seek solutions to the problems and uncontrollable factors encountered in the experiment through discussion and literature review.In the specific implementation of teaching,students take the initiative to complete the preview report,formulate the experimental feasibility plan through sufficient literature research and knowledge summary,become familiar with the operation,and actively discuss with the instructor when they encounter problems.The establishment of comprehensive,innovative experiments can well develop students’practical ability and scientific literacy and help them learn to follow the hot spots of the industry,apply their knowledge flexibly and comprehensively,and accomplish the teaching objectives of improving students’hands-on ability,comprehensive application of knowledge,strong interest in scientific research,and exploratory,innovative thinking.