Presenter: Prof. Diyan Wang （王迪彦 博士）
Topic: New Earth-abundant Materials for Energy Storage Applications: Photo Electronics, Hydrogen Evolution Reaction, Aluminum Ion Battery
Time: 10:00AM, Oct.15th (Thursday)
Location: Conference Room B, BLDG 909-1F
Abstract:
Colloidal pyrite FeS2 nanocrystals (NCs), which are abundant and nontoxic in nature, have attracted attention for developing low-cost fabrications of catalytic electrode and photovoltaic devices using solution processes. Soluble pyrite FeS2 NCs were successfully synthesized within controlled sizes. We demonstrated promising NIR photo-response from a n-p heterojunction\ TiO2/FeS2 device and also try to fabricate a cost-effective counter electrode (CE) by using FeS2 NCs pyrite ink to in dye-sensitized solar cells (DSSCs). We found that FeS2 NC has exhibited excellent electrochemical catalytic activity and remarkable stability in replacing expensive Pt catalysts as a low-cost CE material in DSSCs. Devices using FeS2 NC-based CE show promising power conversion efficiencies comparable to those using the Pt CE. Overall results indicate that earth-abundant FeS2 NC is an interesting candidate of light absorbent and catalysts, which can substantially lower the cost of photovoltaic and DSSCs in future commercial applications. Other applications of FeS2 nano-materials for hydrogen evolution reaction will be also discussed in this talk. Besides, to develop a rechargeable battery which is low cost, highly safe, environmental-friendly and has superior cycle life. Among several novel batteries, the aluminum ion battery has demonstrated lots of advantages, such as nonflammable and three electron redox behaviors resulting in high specific energy density which is favorable for the use in portable devices. Therefore, development of a new rechargeable aluminum battery comprised of a graphite foil cathode will be discussed as well.
Biography:
I am a chemical-physical materials chemist for focusing on Fuel Cell, Photo Energy and Battery application fields and obtained my doctorate degree in Chemistry at the National Taiwan Normal University in June 2010, under the guidance of Professor Chia-Chun Chen. After PhD, I joined into Prof Chun-Wei Chen’s group in the Department of Materials Science and Engineering in National Taiwan University from August 2010 to May 2013. After that, I was invited by Prof. Hongjie Dai in Stanford University to be a Visiting Scholar since June 2013 to present. In the meantime, I was also a Distinguished Postdoctoral Scholar in Institute of Atomic and Molecular Sciences, Academia Sinica. Currently, I am a Project-Appointed Assistant Professor in department of chemistry, National Taiwan Normal University.
Contact: Prof. Yanguang Li