内容简介:

In this presentation, 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 in near future. Relative to 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 easiness 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. Herein, we introduce a new class of high-performance atomic iron dispersed carbon catalysts through controlled chemical doping of Fe 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 0.87 V vs RHE, comparable 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:

武刚教授是电化学能源与燃料电池催化剂研究领域国际知名的学者。他于2004年在哈尔滨工业大学电化学工程专业获得博士学位，之后在清华大学（2004-2006），美国南卡罗莱纳大学（2006-2008），美国能源部洛斯阿拉莫斯国家实验室（2008-2010）从事博士后研究工作。2010年他晋升为该国家实验室的永久研究员。他在洛斯阿拉莫斯国家实验室的燃料电池中心工作了7年，领导和参与了多项重大的课题。该中心是世界上最先进的燃料电池研究基地。2014年他加入纽约州立布法罗大学的化学工程系任助理教授(assistant professor)。该校的化学工程专业在美国享有盛誉 (排名为36)。自从2014年，他获得美国能源部和国家自然基金资助超过三百万美元。由于他的杰出贡献，2018年他提前两年晋升为该校的终身教授 (associate professor)。他发展的非贵金属催化剂被广泛认为是燃料电池催化剂研究的重大突破，使昂贵的铂金催化剂能够被廉价的材料所取代成为可能。这项工作，他以第一作者于2011年发表在《科学》杂志，并受到了广泛的关注(引用超过2200次)。同时他的研究还广泛的涉及到目前的学术研究热点，可再生能源的开发和利用，特别是电化学能源转化和存储, 以及光电催化和先进材料的研究。他已经在国际学术期刊发表SCI研究论文170多篇包括 Science, JACS, Advanced Materials, Account of Chemical Research, Angew. Chem. Int. Ed., ACS Nano, Energy Environ. Sci., Nano Letters, Nano Today, Nano Energy 和Advanced Energy Materials。公开发表专利6项; 参编学术著作8部, 在国际会议作邀请报告50余次。他的工作被引用超过13000次 [h index: 56]。他目前担任RSC Advances期刊的副编辑。

欢迎广大老师和同学们参加！