夏振海 - 石墨烯大会

演讲嘉宾-夏振海

夏振海
北德克萨斯大学副教授

Dr. Zhenhai Xia received his B.S. degree in Mechanical Engineering from Hefei University of Technology of China in 1984, and his M.S. and Ph.D. degrees in Materials Science and Engineering from Northwestern Polytechnic University in 1987 and 1990, respectively. He served on the faculty of Hebei University of Technology between 1990 and 1997 as professor and department chair, Visiting Scientist/Humboldt Research Fellow at German Aerospace Center (DLR) between 1997 and 1999, and Senior Research Associate in solid mechanics at Brown University between 1999 and 2006. He was an tenured Associate Professor of mechanical engineering of the University of Akron, and now an Associate Professor of materials science and engineering of the University of North Texas.

Dr. Xia has a background in Materials science and applied mechanics. His current research interests are focused on nanomechanics and nanomaterials, including polymer, ceramic and metal composites, multifunctional materials, biomimetic materials, thin films and fibrillar materials. He has more than 20 years of research experience with over 80 publications, two book chapters and one patent. His research has been supported by NSF, NASA, U.S. Air Force, etc.

演讲题目：Heteroatom-doped Graphene as Efficient Electrocatalysts for Clean Energy Conversion

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内容摘要

One of key issues in the development of renewable energy production technologies is the discovery of efficient and cost-effective catalysts for use in electrochemical energy conversion processes such as fuel cells and metal-air batteries. In fuel cells, and Li-air batteries, energy conversions need precious metals – primarily Pt – as catalysts to promote electrochemical reactions on the cathode. Efforts are needed to search for an alternative material which is readily available, cost effective and can show comparable catalytic effects for catalytic cathodic reduction in fuel cells. In this talk, doped graphene are introduced as new efficient catalysts for fuel cells and Li-air batteries. Processes such as ball milling were used to fabricate the catalysts. It is demonstrated that N, S and halogen-doped graphenes are an excellent catalyst for fuel cell and batteries promising to replace the expensive platinum electrodes. First-principle simulations were performed to investigate the catalytic mechanisms of the doped graphene. The improved catalytic performance is attributed to the electron-accepting ability of the dopants, which creates net positive charge and spin density on adjacent carbon atoms in the carbon plane.