This course is a graduate-level elective course. The course begins with an overview of sustainable energy to give students a preliminary understanding of the development of sustainable energy. Then, the course mainly focuses on introducing energy storage devices, including their operating principles and energy storage mechanisms. From the perspectives of thermodynamics and kinetics, understanding the mechanisms is essential for effectively proposing directions to improve the performance of the devices. Next, several common green energy devices are introduced, including solar cells, fuel cells, lithium-ion batteries, supercapacitors, and hydrogen storage, among others. At the end of the semester, students form groups to present a project report (both oral presentation and writing essay), where they utilize the content learned in class and their creativity to propose an original idea to improve certain aspects of the energy technologies introduced in class.