Department of Chemistry, Koç University
Koç Universitesi, Rumelifeneri Yolu, Fen Fakültesi 34450, Sarıyer, İstanbul, Türkiye
The Rational Design of Heterojunction Photocatalysts for Hydrogen Production under Visible Light
Hydrogen (H2) has been regarded as one of the most promising candidates to replace the traditional fossil fuel-based energy supply owing to its advantageous features such as having the highest known energy content per mass, being producible from numerous sources including water with various methods in every geography, and directly utilizable in fuel cells . Despite its numerous advantages, hydrogen economy has still faced with the challenges of safe delivery and efficient storage of hydrogen due to its extreme lightness and reactivity, in practical applications . Over the years, chemical hydrogen storage either in solid state or liquid phase proved to having significant advantages in terms of the safety, stability and cost-efficiency . Numerous materials have been tested as chemical hydrogen storage materials, among which ammonia borane (AB)  and formic acid (FA)  have been regarded as the most promising ones. Up to date, numerous catalysts have been developed for the dehydrogenation of AB and FA, which were mostly traditional transition metal nanocatalysts. However, considering the efficacy and the stability of the reported nanocatalysts so far, the development of a more efficient, non-toxic, stable, cost-effective, and environmentally friendly catalysts are still required . In this regard, the utilization of visible-light-driven photocatalysts, allowing the direct conversion of solar energy to chemical energy, in hydrogen generation from AB and FA is one of the most promising approaches to enhance the hydrogen production activity of the traditional heterogeneous catalysts. Additionally, the photocatalytic hydrogen generation from water by utilizing solar energy, namely water splitting, has been regarded as one of the most promising and economic routes for hydrogen storage/production/delivery.2 In this regard, our recent research has been focused on the rational design of heterogeneous photocatalysts for hydrogen generation from the chemical hydrogen storage materials (AB and FA) and from water. In this talk, I will summarize our recent studies on the rationally designed heterojunction photocatalysts comprising the semiconductor two-dimensional (2D) materials (graphitic carbon nitride and black phosphorus) and the transition metal nanoparticles for hydrogen generation from AB, FA, and water under visible light illumination.
Dr. Önder Metin received his B.Sc. degree in Chemistry from Çukurova University, Adana, Turkey in 2002 with the second honor degree. Then, he got a research assistant position at Middle East Technical University, Ankara, Turkey where he received his M.Sc. degree in 2006 and Ph.D. degree in 2010 at Department of Chemistry. During his Ph.D. studies, he studied as a TUBITAK research fellow at Department of Chemistry, Brown University (Rhode Island/USA) in 2009 and at Inorganic Chemistry Research Institute, Darmstadt Technical University, Germany in 2010. After his Ph.D., he moved to Department of Chemistry, Atatürk University, Erzurum, Turkey as an Assistant Professor in 2011. He then joined the Department of Chemistry, Brown University as a Post-Doctoral Research Associate in 2012 for one year. After the post-doctoral studies, he turned back to Atatürk University and promoted to the Associate Professor level in 2014. He then moved to Koç University as an Associate Professor in 2018.