澳门2138cn太阳娱乐网站官网-在线登录

报告内容摘要：
Polymer electrolyte fuel cells (PEFCs) have emerged as a viable technology for portable, automotive and stationary power. As one of the significant technical challenges in a PEFC, water management is critical for high performance and longevity. This talk begins with the challenge of developing a novel optical technique for in-situ probing of the core part of the PEFC. This technique is then used to explore the transport phenomena from macro to micro to nano-scale, and to investigate liquid water formation and dynamics through the porous gas diffusion layer (GDL) and the catalyst layer (CL). Visualization results will be presented for channel/GDL/CL flooding, capillary effects, and the evaporation of water on CL, which is one of its distinguishing mechanisms. A theory is developed to enhance the evaporation and the capillary effects on liquid droplet formation, growth, interaction, and removal in PEFCs. Based on micro/nano characterization, a nano-scale transport model is established to predict the liquid water accumulation in the CL, which is considered as the source of flooding in PEFCs. Emphasis will be given to the PEFC design guidelines developed by this novel technique coupled with nanotechnology.

报告人简介：
Dr. Zhang’s research has focused on development of high-efficiency, sustainable and clean energy systems with micro/nanotechnology, ranging from fundamental understanding to system development of fuel cells, batteries, high-efficiency pulse combustion engines, electrical thrusters, and hybrid energy systems. He has also established a strong expertise in the micro-/nano-scale design, fabrication, and characterization of thermal/fluid, surface, material, optical, and electrical properties, and in the development of advanced spectroscopy. Dr. Zhang has acquired extensive research and teaching experience at several institutions including UTK, Oak Ridge National Lab (ORNL), UD, PSU, UCLA, Stanford University, and Nagoya University. Dr. Zhang is the author of over 60 publications, 2 book chapters and 2 patents. Two of his publications earned the “most cited paper” recognition and one of them won the 1st place prize. He also served as Track Chair and Session Chair in International Conferences on Energy Sustainability and Technology, respectively.