This course explores the forefront of sustainable energy, centering on electrocatalytic applications and battery techniques. This course aims to enable the students to set up the basic concept of using renewable energy efficiently and reasonably, and to train the talents for the society in the field of renewable energy, towards the demands for sustainable energy supply. The principle, energy conversion process, the devices, and the practical utilization will be illustrated. Through a combination of theoretical lectures, and case studies, students will gain a comprehensive understanding of electrocatalysis and battery technologies. Emphasizing critical thinking and problem-solving skills, students will address real-world challenges in the field. By the end of the course, students will possess the knowledge and skills necessary to contribute meaningfully to the evolving landscape of sustainable energy, specifically in the realms of electrocatalytic applications and advanced battery systems.