This book presents the proceedings of the 12th International Conference on Energy Engineering and Environmental Engineering (ICEEEE 2025), held from October 18 to 20, 2025, in Chongqing, China. Jointly organized by Beijing Jiaotong University and the University of Edinburgh, ICEEEE 2025 established itself as a authoritative platform for the exchange of cutting-edge research and innovative solutions in energy and environmental engineering. The conference brought together leading experts, researchers, and practitioners from around the globe to address the most pressing challenges and emerging trends in the field. This book encapsulates a wealth of state-of-the-art research, practical insights, and forward-thinking discussions, offering a comprehensive overview of the latest advancements in renewable energy technologies, energy efficiency, environmental sustainability, and green urban development. Designed for a diverse audience, including academics, industry professionals, and policymakers, this book serves as an invaluable resource for those committed to shaping a sustainable future. It not only provides a snapshot of current achievements but also inspires further innovation and collaboration in the pursuit of global energy and environmental sustainability As the world transitions toward a net-zero future, the insights and solutions presented in this volume underscore the critical role of interdisciplinary research and international cooperation in addressing the dual challenges of energy security and environmental preservation.

Zuo-Yu Sun is the director of the Hydrogen Energy Laboratory (Beijing Jiaotong University, China) and a professor of the Department of Energy and Power Engineering at Beijing Jiaotong University. He is a fellow of Beijing Institute of Thermophysics and Energy Engineering (BITEE), a member of the Hydrogen and Carbon Neutrality Subcommittee (BITEE), a member of the Dual Carbon Industry Cooperation Branch Committee (China Energy Research Association), an editorial board member of “sustainability” (ISSN: 2071-1050) on the subject of “Energy Sustainability”, an editorial advisory member of “Chinese Journal of Urban and Environmental Studies” (English Journal, ISSN: 2345-7481), and a member of the Combustion Institute. He has over 80 journal and conference publications in hydrogen energy involving research in natural and social sciences. Eight of his journal articles had been indexed as ESI articles, and the h-index is 31 (Scopus) with more than 2,570 citations until Feb 2025.

Dr. Prodip Das is an associate professor in Hydrogen Energy Systems with a broad research portfolio focused on energy conversion and storage. His primary research interests include the thermofluid dynamics of Li-ion batteries, hydrogen fuel cells, electrolyzers, flow batteries, and related systems. Additionally, he investigates the safety, health, and environmental challenges associated with electric vehicle batteries. Dr. Das has authored over 130 peer-reviewed articles, seven book chapters, and six books, covering topics such as hydrogen fuel cells, Li-ion batteries, convective heat transfer, and multi-physics modeling. Notably, he is the author of the invited book Fuel Cells for Transportation: Fundamental Principles and Applications. His work has accumulated more than 4,300 citations, resulting in an h-index of 31. Beyond his research, Dr. Das serves as an Associate Editor for the ASME Journal of Electrochemical Energy Conversion and Storage, Frontiers in Energy Research, and Frontiers in Chemical Engineering.