应化工与化学学院徐平教授邀请，纽约州立大学布法罗Gang Wu教授将于近日来我校访问并作学术报告，欢迎感兴趣的老师和同学参加。
讲座题目：Advanced PGM-free Catalyst Technologies for Future Hydrogen Fuel Cells
讲座时间：2017年7月26日15:30
讲座地点：理学楼601
讲座内容简介：In my talk, I will briefly outline current proton exchange membrane fuel cell (PEMFC) technology development for transportation applications in U.S., with a special emphasis on catalyst technologies. Generally, developing highly efficient cathode electrocatalysts for oxygen reduction reaction (ORR) in acid media is crucial for promoting PEMFCs into the market. To significantly reduce the economic and environmental costs of fuel cell technologies for transportation, limited Pt catalysts must be replaced by platinum-group-metal (PGM)-free catalysts derived from earth-abundant elements. Therefore, there is a critical need to continuously develop high-performance PGM-free cathode catalyst with significant improved activity, stability, and MEA performance for practical transportation applications in near future. Relativeto the extensively explored alkaline media,the greater challenge for PGM-free ORR catalysis is in the acidic electrolytes that present more sluggish kinetics and a corrosive environment for PGM-free catalysts.Compared to other studied materials (oxides, sulfides, carbides), carbon-based catalysts often possess many advantages because of their excellent electrical conductivity, high surface areas, low-cost, and ease of functionality. However, proper doping with heteroatoms (e.g., N, S, P) and transition metals (e.g., Fe, Co, or Mn) to modify the electronic and geometric structures of carbon is the key to enhancing catalytic performance. In this talk, we introducea new class of high-performance atomic iron dispersed carbon catalysts through controlled chemical doping of iron ions into zinc-zeolitic imidazolate framework (ZIF),a type of metal-organic framework (MOF).The novel synthetic chemistry enables accurate size control of Fe-doped ZIF catalyst particles with a wide range from 20 to 1000 nm without changing chemical properties, which provides a great opportunity to increase the density of active sites exclusively determined by the catalyst particle size. The best performing catalyst, with optimal morphology and structure has , achieved a new performance milestone for the ORR in challenging acidic media including a half-wave potential of 0.85 VvsRHE, only leaving 20 mV gap with state-of-the-art Pt/C. The high-performance new atomic iron-rich MOF catalysts hold great promise to completely replace Pt for future PEM fuel cells.
报告人简介：Gang Wuis an Assistant Professor in the Department of Chemical and Biological Engineering at the University at Buffalo (UB), SUNY. He obtained his Ph.D. at the Harbin Institute of Technology in 2004 followed by extensive postdoctoral trainings at Tsinghua University (2004–2006), the University of South Carolina (2006–2008), and Los Alamos National Laboratory (LANL) (2008–2010). Then, he was promoted as a permanent staff scientist at LANL until he joined UB in fall of 2014 when he started his academic career. He was trained in electrochemical engineering from his undergraduate education and his current research focuses on electrochemical energy and environmental applications with an emphasis on the development of functional electrocatalysts and energy storage materials.He has written 150 scientific articles (more than 10,000 citations,h-index = 47), 7 invited book chapters, and holds 6 fuel cell catalyst patents.Currently, he is leading and participating multiple fuel cell, battery, and renewable fuels (e.g., NH3) related projects supported by U.S. DOE Fuel Cell Technologies Office, APRA-e Office, and National Science Foundation. He is also an Associate Editor forRSC Advances,a journal published by Royal Society of Chemistry, UK, and an editorial broad member forScientific Report, published by Nature publishing group.
